Powertrain
generic / SAE
P2798
Electric/Auxiliary Transmission Fluid Pump A Control Circuit Low
Voltage on the first auxiliary transmission fluid pump control line is below the expected window. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number7 / 98
Possible causes
- Control wire shorted to ground high
- Motor winding short medium
- Connector pins corroded - high contact resistance 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: medium
- DIY: shop recommended
- Estimated cost: 180–1000 €
- Estimated time: 0.8–3.5 h
- Component: aux trans pump a
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012