Question about 1990 Chevrolet K2500

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Found trouble codes 12,15,33? - 1990 Chevrolet K2500

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Is youn truck diesel 12 ecu replacement
15 coolant temp circuit temp low
33 map sensor signal voltage high

Posted on May 08, 2010

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These are not trouble codes. They are addresses of multiple ECU control modules that the scanner found. You can navigate each one, subject to what it reports. Any actual trouble codes would be stored within each module separately if there are any.

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Code 55 means "no Trouble codes found" code 55 means that thats the end of self testing codes, there is no mode code. just ignore code 55.

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Hope helps (remember to rate thi answer).

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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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According to the book, it is OBD 1. Most of the autopart places do not have the correct equipment to hook up to this car. You will have to find a garage that has the correct equipment. I found a tire place locally that had the correct equipment, and got a code in seconds.

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Trouble Code description


Code 46 is indeed the trouble code for the Idle Speed Controller which is that big black box thingy on your throttle body. A lot of Chilton-type manual books omit that code because the ISC isn't found on pre 94 Metros. The ISC is a computer controlled auto-adjuster for the engine idle.

An important note: code 46 is often caused by misadjusted distributor timing. As you probably know, timing affects the idle, and if improper timing moves the idle beyond the ISC's adjustment range, the check engine light will come on and diagnostics will return code 46.

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