P0788
PowertrainTransmission Solenoidmoderate severityShift/Timing Solenoid High
What P0788 Means
The shift or timing solenoid circuit voltage is reading higher than expected. This usually points to an open circuit or wiring fault.
Symptoms
- Harsh or missing shifts
- Delayed engagement
- Warning light on
Common Causes
- Open circuit in wiring
- Failed solenoid
- Corroded connector
- Faulty valve body
Diagnostic Steps
- Inspect wiring for opens or corrosion
- Retrieve trouble codes
- Check solenoid circuit voltage and resistance
- Inspect valve body function
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
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SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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