Electric/Auxiliary Transmission Fluid Pump Phase U V W Circuit/Open

Common symptoms

What you'll notice

• Check and replace any damaged or loose wiring connections related to the electric/auxiliary transmission fluid pump phase U V W circuit.
• Inspect and replace the electric/auxiliary transmission fluid pump if it is found to be malfunctioning or damaged.
• Verify and repair any faults or issues with the transmission control module (TCM) that may be causing the circuit/open problem.
• Inspect and repair any damaged or faulty fuses or relays that are associated with the electric/auxiliary transmission fluid pump phase U V W circuit.

Common causes

Most likely first

1. Faulty electric/auxiliary transmission fluid pump
2. Loose or damaged wiring or connectors in the electric/auxiliary transmission fluid pump circuit
3. Malfunctioning transmission control module
4. Low transmission fluid level or contaminated fluid

How to diagnose & fix

Work through it in order

1. Transmission may fail to engage or shift properly
2. Vehicle may experience slipping or jerking during acceleration
3. Engine may rev high without corresponding increase in speed
4. Transmission may go into limp mode, limiting gear range and overall performance
5. Check engine light may illuminate, indicating a problem with the transmission system