Question about 1991 GMC Sonoma

Open Question

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

Posted by on

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How can i read the code on my 97 gmc sierra truck

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

Sep 07, 2014 | 2002 GMC Sierra C/K1500

1 Answer

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.

Nov 19, 2013 | 1998 GMC Jimmy

1 Answer

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.

Jun 28, 2012 | 1991 GMC Sonoma

1 Answer

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.

May 30, 2011 | 1991 GMC Suburban

1 Answer

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.

Mar 04, 2010 | 1991 Suzuki Swift

2 Answers

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.

Jul 28, 2009 | 1999 GMC Sierra

1 Answer

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!

Jan 31, 2009 | GMC Envoy XL Cars & Trucks

1 Answer

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 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?

Dec 28, 2008 | 2005 GMC Yukon

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

Not finding what you are looking for?
1991 GMC Sonoma Logo

Related Topics:

293 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

75797 Answers


Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22114 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides