P0B04 Possible Causes
- Faulty auxiliary transmission fluid pump
- Auxiliary transmission fluid pump harness is open or shorted
- Poor electrical connection in auxiliary transmission fluid pump circuit
What Does It Mean?
How to Fix Code P0B04
Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P0B04 Possible Symptoms
Check engine light illuminated (or service engine soon warning light)
P0B04 Meaning
The engine control module (ECM) monitors the auxiliary transmission fluid pump motor. The ECM sets the OBDII code when the auxiliary transmission fluid pump motor signal is outside factory specifications.