What it means
The control system detects an abnormal current draw from auxiliary transmission fluid pump A. The code does not specify whether current is too high or too low.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The controller monitors the electrical current used by auxiliary transmission fluid pump A to assess whether the pump is operating as expected. This code indicates abnormal current draw but does not identify whether it is too high or too low, so wiring, mechanical load, the motor, and the driver all need consideration.
Common causes
Most likely first.
- Faulty pump motor
- Excessive mechanical load on the pump
- Pump wiring or connector fault
- 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
- Save freeze-frame data and check live data for pump A's command and reported current when the fault sets.
- Inspect pump A's connector and wiring for loose terminals, corrosion, damaged insulation, or signs of overheating.
- Check transmission fluid level and condition using the vehicle's specified procedure, and look for evidence that pump A may be mechanically restricted.
- Measure pump A current during a commanded operation using the manufacturer's test procedure and compare it with the manufacturer's specification.
- If current remains abnormal, test pump A's motor and wiring, then check the pump driver output.
Common fixes
- Clean and secure pump A's connector or repair damaged wiring.
- Correct a fluid level or condition problem if found using the vehicle's specified service procedure.
- Replace pump A if its motor is faulty or mechanically binding.
- Repair or replace the pump driver if its output is faulty.
Can I keep driving?
If shifting is harsh, delayed, slipping, or the transmission enters limp mode, avoid driving because pump A may not be operating correctly. If shifts remain normal, restrict driving and have the current fault diagnosed promptly.
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.