What it means
The auxiliary transmission fluid pump control module circuit reports a circuit low 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 operates the pump when the transmission needs it. This code sets when the circuit signal is lower than expected, often because the control wiring is shorted to ground or the module connection or output has failed.
Common causes
Most likely first.
- Short to ground in the pump control circuit
- Poor connector connection
- 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
- Save freeze-frame data and check live transmission data for pump commands and whether the low circuit condition coincides with a shift problem.
- Inspect the pump control connector and wiring for chafing, moisture, loose terminals, or pushed-back pins that could connect the circuit to ground.
- If the fault is active, carefully move the accessible control harness while monitoring the relevant scan-tool data for a change.
- Use the vehicle wiring information to check the control circuit for a short to ground and confirm connector terminal fit.
- If the circuit and connections are sound, verify module power and ground and test its output using the manufacturer's procedure.
Common fixes
- Clean, dry, and reseat the pump control connector.
- Repair control wiring shorted to ground or damaged by chafing.
- Correct loose or pushed-back connector terminals.
- Replace the pump control module if its output circuit is faulty.
Can I keep driving?
Avoid driving if shifts are harsh, delayed, slipping, or the vehicle enters limp mode; a low pump control signal can interfere with auxiliary pump operation. If shifting remains normal, keep trips short and have the circuit checked soon.
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.