code 55...? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-16-2005, 03:50 PM   #1
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hi all, i have a code 55 in my 93 se, and the haynes says it'* an o2 sensor or ecm, and this site just says "ecm". what does that mean, that i have a bad ecm?? cuz the car seems to run fine, i just have that stupid engine light on all the time. i reset the codes once and the light stayed off for a few hours, but came back on again after about 15 minutes of driving. again, the car seems to run and drive fine i just have no idea what to do about this code. thanks for the help!!
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Old 08-16-2005, 03:58 PM   #2
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O2 would be 44 or 45. 55 does indicate a problem with the PCM. At this point, I'd be tempted to simply disconnect and reconnect the PCM a few times. Each connector (disconnect the battery for 30 minutes, play with the connectors, re-connect the PCM, then reconnect the battery).

You may just have some corrosion on a connector for a PCM ground.
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Old 08-16-2005, 04:27 PM   #3
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where is the ecm located on these cars again? thanks.
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Old 08-16-2005, 04:58 PM   #4
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Passenger side floor. Remove the kick panel and you should see the big thin silver box.
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Old 08-16-2005, 06:24 PM   #5
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Quote:
Originally Posted by willwren
O2 would be 44 or 45. 55 does indicate a problem with the PCM. At this point, I'd be tempted to simply disconnect and reconnect the PCM a few times. Each connector (disconnect the battery for 30 minutes, play with the connectors, re-connect the PCM, then reconnect the battery).

You may just have some corrosion on a connector for a PCM ground.
I totally agree with you bill... Too many EGR'* have been put on the car to have not corrected the problem...

Those are ther last items I can think of being the culprit... Wires to the EGR, Connector pinss / Ground or a bad PCM...

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Old 08-17-2005, 01:29 AM   #6
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so it is a possibility that the ecm can be bad even if the car runs perfectly fine?? thats pretty crappy :( any other ideas? thanks.
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Old 08-17-2005, 01:36 AM   #7
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Quote:
Originally Posted by Hootymo
so it is a possibility that the ecm can be bad even if the car runs perfectly fine?? thats pretty crappy :( any other ideas? thanks.
Yes its possible that the PCM could be bad... But we don't want you to buy a PCM and have the problem still be there... That would be a waste of money...

Do you by chance know anyone that has a GM 3800 Powered car that would be the same year as yours? Maybe you could borrow the PCM and do a little testing?

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Old 08-17-2005, 02:02 AM   #8
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unfortunately i dont... not sure what i can do now cuz this thing wont pass inspection without that light staying off, and if i cant figure out whats wrong then im kinda stuck. any other suggestions? just got the car and this kinda sucks... thanks guys
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Old 08-17-2005, 11:12 AM   #9
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I have a suggestion. You have a bunch of NE members up there. We could arrange some help and a swap maybe? What about the Aviator?
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Old 08-17-2005, 08:41 PM   #10
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Actually passenger side up under the dash.


Good luck,
Sellncars

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Passenger side floor. Remove the kick panel and you should see the big thin silver box.
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