Powertrain
generic / SAE
P078C
Shift Timing Solenoid B Low
Shift timing solenoid B control circuit reads stuck low — short to ground.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number7 / 8C
Possible causes
- Control wire shorted to ground 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: medium
- DIY: shop recommended
- Estimated cost: 200–1000 €
- Estimated time: 0.8–3 h
- Component: shift timing solenoid b
- Component: tcm
- MIL / check engine light
Sources
References
sae:J2012