What it means
The auxiliary transmission fluid pump control module circuit reports a circuit high condition. 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.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The auxiliary transmission fluid pump control module circuit commands and supports operation of the pump. This code sets when the circuit signal is higher than expected, which can result from a short to voltage, an open wire, or a failed module output.
Common causes
Most likely first.
- Short to voltage in the pump control circuit
- Open or damaged control wiring
- Faulty pump control module
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
How to diagnose it
- Record freeze-frame data and review live transmission data for the pump command and conditions when the high circuit reading occurs.
- Inspect the control module connector and pump control wiring for chafing, moisture, damaged insulation, loose terminals, or pin push-back.
- While monitoring scan-tool data, carefully move the accessible harness to see whether the high condition changes.
- Using the vehicle wiring information, test the control wire for a short to voltage and check continuity through the circuit.
- If the circuit is intact, verify module power and ground and test the control module output to the manufacturer's procedure.
Common fixes
- Reconnect and secure a loose pump control connector.
- Repair control wiring shorted to voltage or damaged insulation.
- Repair an open section of control wiring if found.
- Replace the pump control module if its output circuit has failed.
Can I keep driving?
Do not keep driving if the transmission shifts harshly, slips, delays engagement, or enters limp mode; those symptoms may worsen with unreliable pump control. If it shifts normally, limit driving and arrange prompt diagnosis.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.