Check engine light with code.....help please! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-07-2008, 05:33 PM   #1
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Default Check engine light with code.....help please!

I have been having a checking engine light that was flashing sometimes and constantly on some times. Varied with how long I drove or how far. Today I changed the plugs, wires, and air filter. Did an interstate drive approx. 50 miles. Car ran smoother and check engine light never flashed, just stayed on from start up till end of drive. Dropped it off at a local mechanics shop and he stated the check engine light on was an injector circuit open on cylinder 3. Code history he gave me was DTC P0203. Any ideas on what this could be or how to repair. The mechanic did not charge me to run the scan and I have got the car at home now. Thanks for any help.
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Old 02-07-2008, 05:36 PM   #2
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did you check the wiring on the #3 injector?

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Originally Posted by Archon
The common cause for that (I assume code P0203) is the wiring or connection to the injector. It could be a bad injector, but it would have to be either open or shorted, not just stuck, in order to throw the code. I'd suggest some resistance or votage checks of the wiring and injectors. That'* easier to do as a start over pulling the fuel rail. Nothing out of the ordinary there, then swapping injectors would be the next step.
that is the front and center one.
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Old 02-07-2008, 05:39 PM   #3
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I will go out right now and go through the wiring. Post with an update shortly. Thank you.
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Old 02-07-2008, 05:44 PM   #4
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Wiring appears good, removed injector 3 harness, peeled back tape and everything appears good and normal. Any other suggestions? Also, while doing the spark plug and wire change I had the negative cable disconnected the whole time. Would that eliminate an old code?
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Old 02-07-2008, 07:05 PM   #5
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Took it for another drive and now it is missing a bit. Codes now are P0300 random/multiple cylinder misfire detected and again the P0203 injector circuit open cylinder 3. Please someone help. Misfire is more noticeable during warm-up and once at normal op temp the mis is less noticeable but still there.

Could any of these be due to the bad sc coupler? I ordered a new coupler today. Just curious. Thanks for the help. Bryan
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Old 02-07-2008, 07:11 PM   #6
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nothing to do with a coupler.

seems like you have a non-operating injector. either swap it with one of your other ones, or get another one to replace it with.
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Old 02-07-2008, 07:12 PM   #7
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Check the pins on the connector. Make sure one of them didn't back out of the connector. Not sure if thats possible. If you wiggle the connector, does the cylinder start to run ? Having the negative cable off should have cleared the code. See if AutoZone will clear the code for you. Then see if it comes back.
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Old 02-07-2008, 07:58 PM   #8
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I will check the above this eve and get back with results I find. Thank you all very much for the help.
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Old 02-08-2008, 11:05 AM   #9
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Checked and no engine. Any other suggestions?
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Old 02-08-2008, 11:26 AM   #10
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Default open injector circuit

The code is telling you open injector on cyl 3. That means the PCM expects to see a certain resistance value on that circuit, and instead it sees infinity, or at least a spec way out of range. Check the resistance of that injector against another injector. If they are the same, then the problem is in the wiring somewhere. Trace it back, somewhere you'll find an open wire or some nice green cheese at a connector. Could be a bad PCM, but not likely. Subsequent codes that you are setting are because with that injecotr not squirting, you are not running right.. Fix that open #3, clear all codes, then verify the repair by seeing if other codes return. Mike
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