Question about 2004 GMC Sierra Denali

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How do you reset computer after removing battery, or after charging battery after it has been dead

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When you restart the car, the ecm will read sensors and reset itself to adapt to inputs it receives. Let the car idle for a few minutes, no gas petal at all, then drive it gently for a few minutes-then drive it normally. Because is has adaptive memory it will adjust for your driving techniques, and within 40 or 50 miles it will be completely set.

Posted on Mar 16, 2011

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You need an OBII scanner. You can either buy one from about $60+ OR.... stop by any good parts store (Autozone, Advance, etc..) and they can do it for you FREE

Posted on Mar 16, 2011

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Posted on Jan 02, 2017

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1 the new battery may not have been charged from the store so would need to be charged before use, charge new battery on a charging set and see if this resoves the problem. *or use slave leads and start from a second vehicle)
2 your alternator may not be charging the battery so after a while it will just die. use a volt meter and check that volage is increaseing to your battery when the engine is running.
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