Powertrain
generic / SAE
P078A
Shift Timing Solenoid B
General fault on shift timing solenoid B — second timing solenoid for shift events that need a different ramp profile (typically downshifts vs. upshifts, or specific gear pairs).
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number7 / 8A
Possible causes
- Solenoid electrical or hydraulic fault high
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–2500 €
- Estimated time: 2–8 h
- Component: shift timing solenoid b
- Component: valve body
- MIL / check engine light
Sources
References
sae:J2012