P0929
PowertrainTransmission Solenoidmoderate severityGear Shift Lock Solenoid Control Circuit Low
What P0929 Means
The gear shift lock solenoid control circuit voltage is reading lower than expected. This usually points to a short to ground or an open in the circuit.
Symptoms
- Shifter stuck in park
- Shift lock inoperative
- Transmission warning light on
Common Causes
- Short to ground in wiring
- Faulty shift lock solenoid
- Corroded connector
- Failed TCM driver circuit
Diagnostic Steps
- Retrieve stored codes
- Inspect wiring for shorts to ground
- Check solenoid resistance
- Backprobe circuit voltage during operation
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