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How to read trouble codes on 1991 gmc - 1991 GMC Sonoma

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To access trouble codes you'll need a code reader or scanner.

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How to Retrieve Car Trouble Codes With No Equipment


You can go to Autozone and they will do a scan for you (usually for free) to get the codes. Unfortunately there isn't a way to read the codes without hooking it up to a machine that can read the codes.

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Ignition timing for 2.5


Should be a sticker on the radiator support or the hood with the instructions.
I think you have to put the ECM in test mode by going into trouble codes to put the timing at base to check it with a light.

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Codes for 91 GMC suburban. what does the code 12 mean


If you mean the flash once and then twice flash code, That means the computer is good as far as being able to read codes. That's it. If you had any stored troub;e codes you would get the code 12 three times and then any stored codes would come after that. they also show up 3 times and then go to the next code if there are more then 1 codes stored. I hope this helps and good luck.

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I have a 1991 swift and cannot find anyone who can read the trouble codes,can it be overidden?


If the codes are not appearing,the computer is bad,there is no overide,the e c m has got to be replaced.

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Trouble code


DTC P0420 Catalyst System Low Efficiency Bank 1

You will find a bad O2 Sensor behind the converter or a bad catalytic converter on the bank 1 side of the exhaust manifold. This is the one on the drivers side.

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I have a 2006 GMC Envoy and the check engine light comes on intermittently, I took it to two auto parts places to have them read the code and both scanners would not read at all??


More then likely you are having trouble with your gas tank venting system. That should have left a code, but not always the case, check it out!

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2005 GMC Yukon


I am not too aufait with these types of vehicles, but I can ssure youo that trouble codes can be found online. Go into Google.com and enter GMC trouble codes. I can't from where I am because the sites are currently blocked from viewing.

Despite that, what are the symptoms the vehicle is giving with these trouble codes?

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1 Answer

Flashes codes 12 and 32 intermittently after running rough


the 12 code is the start for the codes to be read code 32 is a map sensor code but does not mean that , i have a 91 sonoma and same codes turns out it wes my intake gaskets

Aug 18, 2008 | 1991 GMC Sonoma

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