Powertrain
generic / SAE
P277B
Electric/Auxiliary Transmission Fluid Pump B Driver Circuit Performance
The driver stage for the second auxiliary transmission fluid pump does not respond to commands within tolerance.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number7 / 7B
Possible causes
- Aged driver shows degraded switching behaviour medium
- Current feedback loop noisy medium
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: 300–1800 €
- Estimated time: 1.5–5 h
- Component: aux trans pump b driver
- Component: control module
- MIL / check engine light
Sources
References
sae:J2012