Pontiac Engine Light Questions And Answers

Welcome to the Pontiac engine light Question and Answer Page! This page should save you some time from submitting a duplicate question and having to wait for a response. If you can't find the answers you're looking for here, feel free to submit your own question by using our "Get Help" link, or for immediate solutions, see our Wiring Diagrams page. We will include the model in most questions, so you can use the "Find on this page" function of your browser's "Edit" menu to get relevant info for whatever check engine light concerns you may have. For instance, just type in "Grand Prix" and search for responses relating to this vehicle. You could also type in a Pontiac engine light code number by itself such as "P1665" to get all related responses for this trouble code. Just keep hitting "Find next" to go through all relevant check engine light responses. We don't recommend including a model year as this may make your search too narrow, and you may miss out on some relevant posts.

Our Pontiac engine light resources cover a very wide range of concerns, but if you can't find what you're looking for through these links or our code listings, then visit the check engine light "Get Help" link on the navigation bar. As always, all repairs should be attempted only by a qualified individual. Please read our Disclaimer before getting started. Thanks for stopping in, and we hope you have found something helpful from our site! Question:I have a 1997 Pontiac Grand Prix GT. How do you fix a fault code P1665. I do not understand this check engine light code.

Answer:Thanks for contacting us with your Pontiac engine light question. I don't list this code for a '97 but I do for a '98. It is for a circuit check on the "Evaporative Emissions Vent Control Solenoid". The computer monitors voltage on certain circuits when a component is commanded on and this is how it checks for proper circuit and component operation. This check engine light code is set when the computer sees improper voltage on the output circuit controlling the canister vent valve for 30+ seconds with the key on. Start by checking the computer and EVAP canister vent harness connectors for loose pins, corrosion and loose wires. Then check the harness for intermittent wiring concerns (see our article on circuit testing). There is also a fuse for this circuit, so check that this is ok. Likely causes for this concern are a wiring issue or a faulty canister vent solenoid. It is possibly a faulty PCM as well, but not likely. Hope this information was useful.


Question:I have a 1997 Pontiac Grand Am 4 cylinder 2.4L with the following Pontiac check engine light codes:

P0302 - Cylinder 2 Misfire
P0200 - Injector Circuit Malfunction
P0141 - O2 Sensor Heater Circuit Malfunction

Current symptoms include engine sluggish, misfire, poor idle, gasoline smell inside and outside of vehicle. Leaking fuel injector #2 was flooding engine. I have already replaced O2 sensor, plugs and boots, ignition coil for cylinder 2, and fuel injector #2. I turned ignition to ON position before and after installing new injector #2 and fuel sprayed from injector #2, I then switched electrical connectors for injector #1 and #2 and fuel sprayed from injector #1. I have ordered a replacement ECM (computer) and am waiting for delivery. Any other recommendations?

Answer:Thanks for contacting us with your Pontiac check engine light question. Just to understand, you have already replaced the ignition coil, fuel injector and O2 sensor (monitor)? So you are saying that you are getting flow from injector #2 when there should be no flow? If this is the case you should check the injector harness with a noid light to see if it is energized all the time. If so there is likely a wiring issue, or perhaps a faulty injector driver circuit in the ECM. I would check the wiring between the injector and the ECM first as there could be a wire shorted to ground (among other concerns). If the wiring all tests out okay, then you are probably on the right track. Hope this helps! Flooding fuel like you're having can also damage the catalytic converters, so watch for that. Hope this info helps, and let us know if we can be of assistance with any future Pontiac engine light concerns! Thanks!

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