Powertrain
generic / SAE
P078B
Shift Timing Solenoid B Range/Performance
Shift timing solenoid B is electrically intact, but actual shift timing does not match the model — same failure modes as solenoid A (aged, dirty ATF), applied to the second timing channel.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number7 / 8B
Possible causes
- Aged solenoid with weakened force high
- Sensor element aged beyond calibration window low
- Sensor mounting loose - signal damping low
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: transmission fluid
- MIL / check engine light
Sources
References
sae:J2012