P078D OBD II Trouble Code Shift Timing Solenoid B High
How to easily diagnose, repair, and symptoms and causes of a P078D code which means there is a detected high electrical condition with the B shift timing solenoid.
Symptoms of P078D OBD II Trouble Code
- Stuck in gears
- Erratic shifting
- Transmission slippage
- Hard or harsh shifting
- Inefficient shift timing
- Poor driveability
- Poor acceleration
- Overall poor performance
Common Causes of P078D OBD II Trouble Code
- Damaged or defective shift timing solenoid
- Dirty Automatic Transmission Fluid (ATF)
- Low ATF
- Obstruction in ATF passages
- Broken or damaged wiring harness
- TCM issue
- ECM issue
- Pin/connector problem (corrosion, melting, broken lock tab etc.)
Severity of P078D OBD II Trouble Code
I would say this code is moderately severe. If this issue is left unrectified for too long you could cause some serious harm to the transmission not to mention your pocketbook.