Question about 2003 Chevrolet Silverado 2500HD

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I own a 2003 2500 HD Silverado with roughly 110K mi. I noticed my gauge telling me that I need to "change engine oil" one week after having oil changed! A day later I compared my GPS speed to my speedometer and it was 10-12 mph faster than my GPS!

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When you change the oil, you have to reset the computer. It is very easy to do. You turn the key to the on position, then press the gas pedal to the floor 3 times. This will reset the change oil computer.
As far as the speedometer goes. If you have changed tires lately then that would make your speedometer off. If you got taller tires then the speedometer would be faster.
I hope that this helps you! If so PLEASE rate by clicking 4 thumbs up! Thanks! Have a GREAT DAY!

Posted on Oct 03, 2010

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Hi, I think 2 things have happened. 1st, when your oil was changed, the technician did not reset the oil life back to 100%. This can be done by turning the key on, without starting the engine, consistantly push the accelerator to the floor fully, 3 times. At the last time, the oil life should reset to 100%. The other issue sounds like a different size tire may have been installed, causing the speedometer to read incorrect. A dealer should be able to reprogram the computer to accept the correct size tire, therefore making the speedometer read correctly. This should not be an issue, unless the current tire size is not accepted in the computer, at this point, you ned to change to the correct size tire, or realize you may be off on the speedometer, and accomodate for your speed accordingly. Good luck...Coop

Posted on Oct 03, 2010

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