What it means
The control system detects that auxiliary transmission fluid pump A is drawing less current than expected.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The controller monitors current drawn by auxiliary transmission fluid pump A while it runs. This code sets when pump A draws less current than expected, which may mean an open or high-resistance connection, a weak or failed motor, or a faulty driver.
Common causes
Most likely first.
- Open or damaged pump wiring
- Faulty pump motor
- Poor connector connection
- Faulty pump driver
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 data for pump A's command and current reading at the time the fault sets.
- Inspect pump A's connector and wiring for disconnected plugs, broken conductors, corrosion, or loose terminals that could interrupt current.
- Check continuity and connection quality through pump A's power and control circuits using the vehicle wiring information.
- Measure pump A current during a commanded operation and compare the result with the manufacturer's specification.
- If wiring is intact but current remains low, test pump A's motor and then the pump driver output.
Common fixes
- Reconnect pump A or secure a loose connector.
- Repair an open or high-resistance wire in pump A's circuit.
- Replace pump A if its motor fails the manufacturer's test.
- Repair or replace the pump driver if its output is insufficient.
Can I keep driving?
Avoid driving if shifting becomes delayed, harsh, or slips, or if limp mode activates; low current can mean pump A is not providing the expected operation. If the vehicle shifts normally, limit use 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.