Question about 2000 Chevrolet Silverado

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Service Engine soon light flashing or constant

My 2000 Chevy Silverado 2500 (216,000 miles) is having some issues with the Service Engine soon light coming on. I have had the alternator replaced twice in two months. They have installed an ACDelco alternator. The reason I took it in was that the service engine soon light would come on, be steady, then go off. The SES light has also come on, flashed, and then went off. The voltage meter moves back and forth. Also, the interior and exterior lights were dimming and brightening often, even after I had the alternator replaced the first time. The heating/cooling fan was doing the same thing. There is still an issue with these now after the second alternator, but not as bad as before. The mechanic is now telling me the codes P1637 and P0300 are coming up on the computer. They are talking about replacing the alternator for a third time. Do you have some input on this situation? Thanks in advance!

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Code 1637 is a generator l circuit code code 300 is a multiple misfire code. from what you are describing i would lean towards wiring problem with alternator circuit.

The L-terminal circuit from the generator is a discrete circuit into the Powertrain Control Module (PCM) . The PCM supplies the ignition voltage to the generator lamp feed. This ignition voltage is pulled low by the generator once the ignition switch supplies ignition 1 voltage . The voltage stays low until the generator turns. When the generator is up and running, the PCM detects ignition voltage. Therefore, with no failures with the vehicles charging system, the lamp terminal circuit will go low 0 volts when the ignition switch is powered up and then goes to the ignition voltage after the engine is started.

I find it hard to believe you need a third alternator. if you do something is going on to burn them up. have them check wires might have a harness rubbed thru grounding out at times

Posted on Jan 27, 2009

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