P0787: Shift Timing Solenoid A Low
What to do
Expect poor shift quality with all gears still present. Driveable, but worth attending to before shift quality declines further.
What this code means
The shift timing solenoid circuit is reading below its valid range, normally a short to ground. Because the solenoid harness runs inside the transmission through a sealed pass-through, fluid wicking along the wire strands is a recurring cause of shorts that look like nothing from outside the case.
Likely causes
Start here
- Wiring shorted to ground · moderate
- Failed shift timing solenoid · moderate
- Fluid tracking into the transmission connector · moderate
Less common
- Corroded transmission connector · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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