P0928moderate severityPowertrain
Gear Shift Lock Solenoid Control Circuit Range/Performance
on 2009 Audi A8 4.2L V8 · AWD
What this code means
The gear shift lock solenoid circuit is reading outside its normal operating range. This can prevent the shifter from locking or unlocking as designed.
Symptoms
- Shifter won't move out of park
- Intermittent shift lock operation
- Transmission warning light on
Common causes
- Faulty shift lock solenoid
- Wiring harness fault
- Poor ground connection
- Failed TCM output driver
Diagnostic steps
- Scan for related codes
- Check solenoid connector and wiring
- Measure solenoid resistance
- Test solenoid command with scan tool
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