You are starting to have a transmission problem. I know....the Envoy runs fine....well, this code is telling you that there is a beginning of a problem with your transmission system. It could be a wire, could be a rock that was ran over flicked up under there and possible damaged something.....
Bottom line, there is a an issue developing. Suggestion? Check with AAMCO...it is free and they can give you an idea what the seriousness is.
Trouble Code: P0753 (5.3L V8 VIN P Auto)
A/T 1-2 Shift Solenoid Circuit Malfunction (4L60-E, 4L65-E)
Trouble Code Conditions:
Engine runtime over 5 seconds, system voltage at 10-18v, engine not in Fuel Cutoff mode, and the PCM detected an unexpected voltage condition on the A/T 1-2 Shift solenoid circuit.
Possible Causes:
SOURCE: check engine light on - 2003 gmc envoy XL
That code represents a lower than expected reading for temperature (coolant). First thing to do is check your coolant level, as if it is low, then the sensor can not read correctly. Second, you may have a thermostat that is stuck open, allowing the coolant to cool off too much. The sensor should be mounted on top of the engine, near the thermostat housing.
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