Electric/Auxiliary Transmission Fluid Pump Control Module Feedback Signal High
What it means
The feedback signal from the electric auxiliary transmission fluid pump control module is reading above the range the module expects. That pump keeps transmission fluid flowing when the engine is off, such as during automatic engine-off in a hybrid, and the module checks the pump's reported feedback against what it commanded.
Can I keep driving? Usually yes in the short term, but poor fluid flow can hurt the transmission, so get it read soon and avoid hard driving.
What this part does
This module runs the auxiliary electric transmission fluid pump, controlling its speed and monitoring its operation. It takes requests from the transmission control module and drives the pump when the engine is not providing fluid pressure, such as during start-stop operation. Some designs use high voltage, where service is for trained people. A failure can lead to delayed engagement or shifting problems.
Common symptoms
What you'll notice
- Transmission slipping or difficulty shifting gears
- Delayed engagement when shifting into drive or reverse
- Harsh or rough shifting between gears
- Overheating of transmission fluid
- Illumination of the "Check Engine" light
Common causes
Most likely first
- Faulty electric/auxiliary transmission fluid pump control module
- Malfunctioning transmission fluid pump
- Wiring issues or loose connections related to the control module or pump
- Low transmission fluid level or contaminated fluid
- Sensor or feedback signal malfunction
How to diagnose & fix
Work through it in order
- Verify connection and wiring between the electric/auxiliary transmission fluid pump control module and the feedback signal components
- Check for any damage or corrosion in the wiring or connectors related to the electric/auxiliary transmission fluid pump control module feedback signal
- Inspect the electric/auxiliary transmission fluid pump control module for any faults or malfunctions, and consider replacing if necessary
- Ensure the correct transmission fluid level and quality, and perform a transmission fluid flush if needed
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