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GMC Check Engine Light Codes

Welcome to the GMC Check Engine Light codes page. Below you will find the most complete list of GMC trouble codes available. The code definitions are a good starting point when determining the cause of the service engine light but where do you go from there? We have a large number of resources to help you repair the problem.

Here is how we suggest you proceed. Look up your code definition. This tells you where to start testing. If you are unsure of any abbreviations, check out the acronym list by clicking on the link at the left. Next, read our article Automotive Circuit Testing 101, and if there is an article related to the system you are testing, such as Oxygen Sensors or EGR concerns, read these as well. They will provide valuable info! If there is a link to a specific diagnosis strategy for the code then follow that and start testing. If there is no procedure for your manufacturer specific code, then I suggest referring to a similar generic OBD II code (these are listed numerically by system type) to get a good idea of what to look for. If at this point you still need assistance use the "Get Help" link and let us know how we can help. We can provide information on component location, specifications, circuit color/location and more. We do ask that you please read the info available on the site first so that we can help reduce repeat questions. So please read our Disclaimer and when you’re ready jump in!

Also, we value your feedback and like to hear stories of unusual fixes or concerns you may have run into with your Check Engine Light, so feel free to share your experiences by using the "Contact Us" link. Let’s go!

We do our best to update these GMC Check Engine Light codes as frequently as possible. If you find one missing let us know and we we'll add it immediately! Please use the form on our Contact Page to get in touch with us. We certainly understand how frustrating it can be to look for a code definition and have it not online when you need it. And lets face it, if the service engine light is on then you need it now! It's easiest to use the "Find On This Page" feature of your browser's "Edit" menu to find codes on this page as the list is quite long. These are listed in numerical order for easy searching.

When retrieving GMC trouble codes with an OBD II scan tool, proceed as follows:
1. Connect scan tool to the 16-pin data link connector (DLC) located underneath the steering column. The connector may have a removable cover.
2. Turn the ignition on.
3. Follow scan tool manufacturer’s operating instructions to access the Diagnostic Trouble Codes (DTC's).

Remember, these are manufacturer specific codes only. Refer to our Generic OBD II code list for definitions on all other GMC diagnostic trouble codes.



Manufacturer Specific Codes

P1031 HO2S Heater Current Monitor Control Circuit Sensors 1

P1032 HO2S Heater Warm Up Control Circuit Sensors 1 - Read Our Article On Oxygen Sensor Codes For Help With This GMC Trouble Code

P1105 Secondary Vacuum Sensor Circuit

P1106 MAP Sensor Circuit Intermittent High Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1107 MAP Sensor Circuit Intermittent Low Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1108 BARO To MAP Sensor Circuit Comparison Too High

P1109 Secondary Port Throttle System

P1111 Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Trouble Code

P1112 Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Trouble Code

P1113 Intake Resonance Switchover Valve Circuit

P1114 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Trouble Code

P1115 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1116 ECT Signal Unstable Or Intermittent - Read Our Article on Intermittent Diagnosis For Help With This GMC Check Engine Light Code

P1117 Engine Coolant Temp Signal Out-Of-Range Low

P1118 Engine Coolant Temp Signal Out-Of Range High

P1119 ECT Signal Out Of Rage With TFT Sensor

P1120 Throttle Position (TP) Sensor 1 Circuit

P1121 TP Sensor Circuit Intermittent High Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Trouble Code

P1122 TP Sensor Circuit Intermittent Low Voltage - Read Our Article on Intermittent Diagnosis For Help With This GMC Trouble Code

P1125 Accelerator Pedal Position (APP) System

P1130 HO2S Circuit Low Variance Bank 1 Sensor 1 - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1131 HO2S Circuit Low Variance Bank 1 Sensor 2 - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1132 H02S Circuit Low Variance Bank 2 Sensor 1 - Read Our Article On Oxygen Sensor Codes For Help With This GMC Trouble Code

P1133 HO2S Insufficient Switching - Read Our Article On Oxygen Sensor Codes For Help With This GMC Trouble Code

P1134 HO2S Transition Time Ratio - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1135 HO2S Lean Average Bank 1 Sensor 1 - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1136 HO2S Rich Average Bank 1 Sensor 1 - Read Our Article On Oxygen Sensor Codes For Help With This GMC Trouble Code

P1137 HO2S Bank 1 Sensor 2 Lean Or Low Voltage - Read Our Article On Oxygen Sensor Codes For Help With This GMC Trouble Code

P1138 HO2S Bank 1 Sensor 2 Rich Or High Voltage - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1139 HO2S Insufficient Switching Bank 1 Sensor 2 - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1140 HO2S Transition Time Ratio Bank 1 Sensor 2 - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1141 HO2S Bank 1 Sensor 2 Average Voltage Level - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1143 HO2S Bank 1 Sensor 3 Lean Or Low Voltage - Read Our Article On Oxygen Sensor Codes For Help With This GMC Trouble Code

P1144 HO2S Bank 1 Sensor 3 Rich Or High Voltage - Read Our Article On Oxygen Sensor Codes For Help With This GMC Trouble Code

P1145 HO2S Cross Counts Bank 1 Sensor 3 - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1153 HO2S Insufficient Switching - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1154 HO2S Transition Time Ratio - Read Our Article On Oxygen Sensor Codes For Help With This GMC Trouble Code

P1155 HO2S Lean Average Bank 2 Sensor 1 - Read Our Article On Oxygen Sensor Codes For Help With This GMC Trouble Code

P1156 HO2S Rich Average Bank 2 Sensor 1 - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1157 HO2S Bank 2 Sensor 2 Lean System Or Low Voltage - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1158 HO2S Bank 2 Sensor 2 Rich Or High Voltage - Read Our Article On Oxygen Sensor Codes For Help With This GMC Trouble Code

P1159 HO2S Cross Counts Bank 2 Sensor 2 - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1161 HO2S Heater Power Stage Circuit Bank 2 Sensor 2 - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1163 HO2S Bank 2 Sensor 3 Lean System Or Low Voltage - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1164 HO2S Bank 2 Sensor 3 Rich Or High Voltage - Read Our Article On Oxygen Sensor Codes For Help With This GMC Check Engine Light Code

P1165 HO2S Cross Counts Bank 2 Sensor 2 - Read Our Article On Oxygen Sensor Codes For Help With This GMC Trouble Code

P1170 Bank To Bank Fuel Trim Offset

P1171 Fuel System Lean During Acceleration

P1185 Engine Oil Temperature Circuit

P1186 EOT Circuit Performance

P1187 EOT Sensor Circuit Low Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Trouble Code

P1188 EOT Sensor Circuit High Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1189 Engine Oil Pressure Switch Circuit

P1190 Engine Vacuum Leak

P1191 Intake Air Duct Air Leak

P1200 Injector Control Circuit

P1201 (Alternative Fuel) Gas Mass Sensor Circuit Range/Performance

P1202 (AlternativeFuel) Gas Mass Sensor Circuit Low Frequency

P1203 (Alternative Fuel) Gas Mass Sensor Circuit High Frequency

P1211 Mass Air Flow Circuit Intermittent High - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1212 Mass Air Flow Circuit Intermittent Low - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1214 Injection Pump Timing Offset

P1215 Ground Fault Detection Indicated

P1216 Fuel Solenoid Response Time Too Short

P1217 Fuel Solenoid Response Time Too Long

P1218 Injection Pump Calibration Circuit

P1219 Throttle Position Sensor Refernce Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1220 Throttle Position (TP) Sensor 2 Circuit

P1221 Throttle Position (TP) Sensor 1- 2 Correlation

P1222 Injector Control Circuit Intermittent - Read Our Article on Intermittent Diagnosis For Help With This GMC Check Engine Light Code

P1225 Injector Circuit Cylinder 2 Intermittent - Read Our Article on Intermittent Diagnosis For Help With This GMC Check Engine Light Code

P1228 Injector Circuit Cylinder 3 Intermittent - Read Our Article on Intermittent Diagnosis For Help With This GMC Check Engine Light Code

P1231 Injector Circuit Cylinder 4 Intermittent - Read Our Article on Intermittent Diagnosis For Help With This GMC Check Engine Light Code

P1234 Injector Circuit Cylinder 5 Intermittent - Read Our Article on Intermittent Diagnosis For Help With This GMC Check Engine Light Code

P1237 Injector Circuit Cylinder 6 Intermittent - Read Our Article on Intermittent Diagnosis For Help With This GMC Check Engine Light Code

P1240 Injector Circuit Cyllinder 7 Intermittent - Read Our Article on Intermittent Diagnosis For Help With This GMC Check Engine Light Code

P1243 Injector Circuit Cylinder 8 Intermittent - Read Our Article on Intermittent Diagnosis For Help With This GMC Check Engine Light Code

P1245 Intake Plenum Switchover Valve

P1250 Early Fuel Evaporation Heater Circuit

P1257 Supercharger System Overboost

P1258 Engine Coolant Overtemperature - Protection Mode Active

P1260 Last Test Failed SCC Or Theft Detected, Vehicle Immobilized

P1270 Accelerator Pedal Position Sensor A/D Converter Error

P1271 APP Sensor 1-2 Performance

P1272 Accelerator Pedal Position Sensor 2

P1273 Accelerator Pedal Position Sensor 1

P1274 Injectors Wired Incorrectly

P1275 Accelerator Pedal Position (APP) Sensor 1 Circuit - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1276 Accelerator Pedal Position (APP) Sensor 1 Performance

P1277 Accelerator Pedal Position Sensor 1 Circuit Low Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1278 Accelerator Pedal Position Sensor 1 Circuit High Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1280 Accelerator Pedal Position (APP) Sensor 2 Circuit - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1281 Accelerator Pedal Position (APP) Sensor 2 Performance

P1282 Accelerator Pedal Position Sensor 2 Circuit Low Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1283 Accelerator Pedal Position Sensor 2 Circuit High Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1285 Accelerator Pedal Position (APP) Sensor 3 Circuit - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1286 Accelerator Pedal Position (APP) Sensor 3 Performance

P1287 Accelerator Pedal Position Sensor 3 Circuit Low Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1288 Accelerator Pedal Position Sensor 3 Circuit High Voltage< - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light CodeBR>
P1300 Ignitor Circuit - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1305 Ignition Coil 2 Primary Feedback Circuit

P1310 Ignition Coil 3 Primary Feedback Circuit

P1315 Ignition Coil 4 Primary Feedback Circuit

P1320 IC Module 4X Ref Circuit Intermittent, No Pulses

P1321 Electronic Ignition System Fault Line

P1322 EI System Or Ignition Control Missing

P1323 24X Reference Circuit Low Frequency

P1324 Crank RPM Too Low

P1335 CKP Circuit

P1336 Crankshaft Position (CKP) System Variation Not Learned

P1345 CKP/CMP Correlation

P1346 Intake Camshaft Position (CMP) Sensor System Performance

P1350 Ignition Contol System

P1351 IC Circuit High Voltage

P1352 IC Output High/Pulse Detected When Grounded Cyl.2

P1353 IC Output High/Pulse Detected When Grounded Cyl.3

P1354 IC Output High/Pulse Detected When Grounded Cyl.4

P1355 IC OUtput High/Pulse Detected When Grounded Cyl.5

P1356 IC Output High/Pulse Detected When Grounded Cyl.6

P1357 IC Output High/Pulse Detected When Grounded Cyl.7

P1358 IC Output High/Pulse Detected When Grounded Cyl.8

P1359 Ignition Control Circuit Group A

P1360 Ignition Control Circuit Group B

P1361 IC Circuit Low Voltage

P1362 IC Cylinder 2 Not Toggling After Enable

P1363 IC Cylinder 3 Not Toggling After Enable

P1364 IC Cylinder 4 Not Toggling After Enable

P1365 IC Cylinder 5 Not Toggling After Enable

P1366 IC Cylinder 6 Not Toggling AFter Enable

P1367 IC Cylinder 7 Not Toggling After Enable

P1368 IC Cylinder 8 Not Toggling After Enable

P1370 IC Module 4X Reference Circuit, Too Many Pulses

P1371 DI Low Resolution Circuit

P1372 Crankshaft Position Sensor Circuit Performance

P1374 3X Reference Circuit

P1375 24X Reference Circuit High Voltage

P1376 Ignition Ground Circuit

P1377 IC Module CAM Pulse To 4X Reference Pulse Comparison

P1380 Misfire Detected - Rough Road Data Not Available

P1381 Misfire Detected - No Communication with Brake Control Module

P1390 Wheel Speed Sensor 1, G-Sensor Circuit

P1391 Wheel Speed Sensor 1, G-Sensor Circuit Performance

P1392 Wheel Speed Sensor 1, G-Sensor Circuit Low Voltage

P1393 Wheel Speed Sensor 1, G-Sensor Circuit High Voltage

P1394 Wheel Speed Sensor 1, G-Sensor Circuit Intermittent

P1395 Wheel Speed Sensor 2, G-Sensor Circuit

P1396 Wheel Speed Sensor 2, G-Sensor Circuit Performance

P1397 Wheel Speed Sensor 2, G-Sensor Circuit Low Voltage

P1398 Wheel Speed Sensor 2, G-Sensor Circuit High Voltage

P1399 Wheel Speed Sensor 2, G-Sensor Circuit Intermittent

P1403 Exhaust Gas Recirculation System Valve 1 - Read Our Article on EGR Valve Codes For Help With This GMC Check Engine Light Code

P1404 Exhaust Gas Recirculation System Valve 2 - Read Our Article on EGR Valve Codes For Help With This GMC Check Engine Light Code

P1405 Exhaust Gas Recirculation System Valve 3 - Read Our Article on EGR Valve Codes For Help With This GMC Check Engine Light Code

P1406 EGR Valve Pintle Position Circuit - Read Our Article on EGR Valve Codes For Help With This GMC Check Engine Light Code

P1407 EGR Air Intrusion In Exhaust Supply To EGR Valve - Read Our Article on EGR Valve Codes For Help With This GMC Check Engine Light Code

P1408 Intake Manifold Pressure Sensor Circuit

P1409 EGR Vacuum System Leak - Read Our Article on EGR Valve Codes For Help With This GMC Check Engine Light Code

P1410 Fuel Tank Pressure System

P1415 Secondary Air Injection (AIR) System

P1416 AIR System Bank 1

P1418 Secondary Air Injection System Relay A Control Circuit High

P1420 Intake Air Low Pressure Switch Circuit Low Voltage

P1421 Intake Air Low Pressure Switch Circuit High Voltage

P1423 Intake Air High Pressure Switch Circuit High Voltage

P1431 Fuel Level Sensor 2 Performance

P1432 Fuel Level Sensor 2 Circuit Low Voltage

P1433 Fuel Level Sensor 2 Circuit High Voltage

P1441 Evaporative Emission (EVAP) System Flow During Non-Purge

P1442 EVAP Vacuum Switch High Voltage During Ignition On

P1450 Barometric Pressure Sensor Circuit

P1451 Barometric Pressure Sensor Performance

P1460 Cooling Fan Control System

P1480 Cooling Fan 1 Control Circuit High

P1483 Engine Coolilng System Performance

P1500 Starter Signal Circuit

P1501 Vehicle Speed Sensor Circuit Intermittent

P1502 Theft Deterrent System - No Password Received

P1503 Theft Deterrent System - Password Incorrect

P1504 Vehicle Speed Output Circuit

P1508 IAC System Low RPM

P1509 IAC System High RPM

P1510 Back UP Power Supply

P1511 Throttle Control System-Backup System Performance

P1514 Throttle Body Performance

P1515 Control Module Throttle Actuator Position Performance

P1516 Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

P1517 Throttle Actuator Control (TAC) Module Performance

P1518 Throttle Actuator Control (TAC) Module Serial Data Circuit

P1519 Electronic Throttle Module Low Volts Communication Disable

P1520 Gear Indicator System

P1521 Transmission Engaged At High Throttle Angle

P1522 Park/Neutral To Drive/Reverse At High RPM

P1523 Electronic Throttle Control Throttle Return

P1524 TP Sensor Learned CI, Throttle Angle Out Of Range

P1525 Throttle Body Service Required

P1526 TP Sensor Learn Not Complete

P1527 Transmission Range/Pressure Switch Comparison

P1528 Governor

P1529 Heated Windshield Request Problem

P1530 Ignition Timing Adjustment Switch Circuit

P1531 A/C Low Side Temerature Sensor Fault

P1532 A/C Evaporator Temperature Sensor Circuit Low Voltage

P1533 A/C Evaporator Temperature Sensor Circuit High Voltage

P1534 A/C High Side Temperature Sensor Low Voltage

P1535 A/C High Side Temperature Sensor Circuit

P1536 A/C System - ECT Overtemperature

P1537 A/C Request Circuit Low Voltage

P1538 A/C request Circuit High Voltage

P1539 Air Conditioning (A/C) Clutch Feedback Circuit High Voltage

P1540 A/C System High Pressure

P1541 A/C High Side Over Temperature

P1542 A/C System High Pressure High Temperature

P1543 A/C System Performance

P1544 A/C Refrigerant Condition Very Low

P1545 A/C Clutch Relay Control Circuit

P1546 Air Conditioning (A/C) Clutch Feedback Circuit Low Voltage

P1547 A/C System Performance Degraded

P1548 A/C Recirculation Circuit

P1554 Cruise Engaged Circuit High Voltage

P1555 Electronic Variable Orifice Output

P1558 Cruise Control Servo Indicates Low

P1559 Cruise Control Power Mangement Mode

P1560 Cruise Control System-Transaxle Not In Drive

P1561 Cruise Vent Solenoid

P1562 Cruise Vacuum Solenoid

P1563 Cruise Vehicle Speed/Set Speed Difference Too High

P1564 Cruise Control System - Vehicle Accel Too High

P1565 Cruise Servo Position Sensor

P1566 Cruise Control System-Engine RPM Too High

P1567 Cruise Control System-Active Braking Control Active

P1568 Cruise Servo Stroke Greater Than Commanded In Cruise

P1569 Cruise Servo Stroke High While Not In Cruise

P1570 Cruise Control System-Traction Control Active

P1571 TCS PWM Circuit No Frequency

P1572 ASR Active Circuit Low Too Long

P1573 PCM/EBTCM Serial Data Circuit

P1574 Stoplamp Switch Circuit

P1575 Extended Travel Brake Switch Circuit

P1576 BBV Sensor Circuit High Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1577 BBV Sensor Circuit Low Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1578 BBV Sensor Circuit Low Vacuum

P1579 P/N To D/R At High Throttle Angle

P1580 Cruise Move Circuit Low Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1581 Cruise Move Circuit High Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1582 Cruise Direction Circuit Low Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Trouble Code

P1583 Cruise Direction Circuit High Volume

P1584 Cruise Control Disabled

P1585 Cruise Inhibit Control Circuit

P1586 Cruise Control Brake Switch 2 Circuit

P1587 Cruise Control Clutch Control Circuit Low

P1588 Cruise Control Clutch Control Circuit High

P1599 Engine Stall Or Near Stall Detected

P1600 PCM Battery

P1601 Serial Communication Problem With Devise 1

P1602 Loss Of EBTCM Serial Data

P1603 Loss Of SDM Serial Data

P1604 Loss Of IPC Serial Data

P1605 Loss OF HVAX Serial Data

P1606 Serial Communication Problem With Device 6

P1607 Serial Communication Problem With Devise 7

P1608 Serial Communication Problem With Device 8

P1609 Loss Of TCS Serial Data

P1610 Loss Of PZM Serial Data

P1611 Loss Of CVRTD Serial Data

P1612 Loss OF IPM Serial Data

P1613 Loss Of DIM Serial Data

P1614 Loss Of RIM Serial Data

P1615 Loss Of VTD Serial Data

P1617 Engine Oil Level Switch Circuit

P1619 Engine Oil Life Monitor Reset Circuit

P1620 Low Coolant Circuit

P1621 PCM Memory Performance

P1622 Cylinder Select

P1623 Transmission Temp Pull-Up Resistor

P1624 Customer Snapshot Data Available

P1625 PCM System Reset

P1626 Theft Deterrent Fuel Enable Signal Lost

P1627 A/D Performance

P1628 ECT Pull-Up Resistor

P1629 Theft Deterrent System-Cranking Signal

P1630 Theft Deterrent Learn Mode Active

P1631 Theft Deterrent Start Enable Signal Not Correct

P1632 Theft Deterrent System-Fuel Disabled

P1633 Ignition Supply Power Circuit Low Voltage

P1634 Ignition 1 Power Circuit Low Voltage

P1635 5 Volt Reference 1 Circuit

P1636 PCM Stack Overrun

P1637 Generator L-Terminal Circuit

P1638 Generator F-Terminal Circuit

P1639 5 Volt Reference 2 Circuit

P1640 Driver 1-Input High Voltage

P1641 FC Relay 1 Control Circuit

P1642 FC Relay 2 And 3 Control Circuit

P1643 Engine Speed Output Circuit

P1644 TP Output Circuit

P1645 EVAP Solenoid Output Circuit

P1646 Driver 1 Line 6

P1647 Driver 1 Line 7

P1650 Driver 2-Input High Voltage

P1651 Fan 1 Relay Control Circuit

P1652 Powertrain Induced Chassis Pitch Output Circuit

P1653 Oil Level Lamp Control Circuit

P1654 Service Throttle Soon Lamp Control Circuit

P1655 EVAP Purge Solenoid Control Circuit

P1656 Driver 2 Line 6

P1657 1-4 Upshift Solenoid Control Circuit

P1658 Starter Enable Relay Control Circuit

P1660 Cooling Fans Control Circuit

P1661 MIL Control Circuit

P1662 Cruise Control Inhibit Control Circuit

P1663 Oil Life Lamp Control Circuit

P1664 1-4 Upshift Lamp Control Circuit

P1665 Driver 3 Line 5

P1666 Driver 3 Line 6

P1667 Reverse Inhibit Solenoid Control Circuit

P1669 ABS Unit Expected

P1670 Driver 4

P1671 Driver 4 Line 1

P1672 Low Engine Oil Level Lamp Control Circuit

P1673 Engine Hot Lamp Control Circuit

P1674 Tachometer Control Circuit

P1675 EVAP Vent Solenoid Control Circuit

P1676 Driver 4 Line 6

P1677 Driver 4 Line 7

P1680 Driver 5

P1681 Driver 5 Line 1

P1682 Driver 5 Line 2

P1683 Driver 5 Line 3

P1684 Driver 5 Line 4

P1685 Driver 5 Line 5

P1686 Driver 5 Line 6

P1687 Driver 5 Line 7

P1689 Delivered Torque Circuit Fault

P1690 ECM Loop Overrun

P1691 Coolant Gage Circuit Low Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1692 Coolant Gage Circuit High Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1693 Tachometer Circuit Low Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1694 Tachometer Circuit High Voltag - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Codee

P1695 Remote Keyless Entry Circuit Low

P1696 Remote Keyless Entry Voltage High

P1700 Transmission MIL Request

P1701 Transmission MIL Request Circuit

P1705 P/N Signal Output Circuit

P1740 Transmission Torque Reduction Request Circuit

P1743 TP Signal From ECM

P1760 ECM Supply Voltage Interrupted

P1779 Engine Torque Delivered To TCM Signal

P1780 Park/Neutral Postion (PNP) Switch Circuit Engine Torque Signal Circuit

P1790 Transmission Control Module Checksum

P1791 Transmission Control Module Loop

P1792 Transmission Control Module Reprogrammable Memory

P1793 Transmission control Module Stack Overrun

P1795 CAN Bus-Throttle Body Position

P1800 TCM Power Control Relay Circuit Open

P1801 Performance Selector Switch Failure

P1804 Ground Control Relay

P1810 TFP Valve Position Switch Circuit

P1811 Maximum Adapt And Long Shift

P1812 Transmission Over Temperature Condition

P1813 Torque Control

P1814 Torque Converter Overstressed

P1815 Transmission Range Switch-Start In Wrong Range

P1816 TFP Valve Position Switch-Park/Neutral With Drive Ratio

P1817 TFP Valve Position Switch-Reverse With Drive Ratio

P1818 TFP Valve Position Switch-Drive Without Drive Ratio

P1819 Internal Mode Swtich No Start, Wrong Range

P1820 Internal Mode Switch Circuit A Low

P1822 Internal Mode Switch Circuit B High

P1823 Internal Mode Switch Circuit P Low

P1825 Internal Mode Switch Illegal Range

P1826 Internal Mode Switch Circuit C High

P1831 PC Solenoid Power Circuit Low Voltage

P1833 A/T Solenoids Power Circuit Low Voltage

P1835 Kick-Down Switch

P1836 Kick-Down Switch Failed Open

P1837 Kick-Down Switch Failed Short

P1842 1-2 Shift Solenoid Circuit Low Voltage

P1843 1-2 Shift Solenoid Circuit High Voltage

P1844 Torque Reduction Signal Circuit Desired By TCM

P1845 Transmission Gear Ratio Output Circuit

P1847 2-3 Shift Solenoid Circuit High Voltage

P1850 Brake Band Apply Solenoid Circuit

P1851 Brake Band Apply Solenoid Performance

P1852 Brake Band Apply Solenoid Low Voltage

P1853 Brake Band Apply Solenoid High Voltage

P1860 TCC PWM Solenoid Circuit Electrical

P1864 Torque Converter Clutch Circuit

P1868 Transmission Fluid Life

P1870 Transmission Component Slipping

P1871 Undefined Gear Ratio

P1873 TCC Stator Temp. Switch Circuit Low

P1874 TCC Stator Temp. Switch Circuit High

P1875 4WD Low Switch Circuit

P1884 TCC Enable/Shift Light Circuit

P1886 Shift Timing Solenoid

P1887 TCC Release Switch Circuit

P1890 ECM Data Input Circuit

P1891 Throttle Position Sensor PWM Signal Low

P1892 Throttle Position Sensor PWM Signal High

P1893 Engine Torque Signal Low Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1894 Engine Torque Signal High Voltage - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

P1895 TCM To ECM Torque Reduction Circuit - Read Our Article on Automotive Circuit Testing For Help With This GMC Check Engine Light Code

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