The code signals that the PCM has detected insufficient voltage or a fault in the circuit that drives the electric auxiliary transmission fluid pump. This pump supplies pressurized fluid for smooth shifting and torque converter operation.
The pump motor can fail internally, losing the ability to draw power and causing low circuit voltage.
Corroded, damaged, or loose wiring or connector can restrict voltage to the pump, triggering the low circuit reading.
A fuse protecting the pump circuit may have blown, cutting power to the pump and causing a low voltage condition.
If the relay that supplies power to the pump fails, the pump will not receive voltage despite a healthy circuit.
The PCM's control output for the pump may be defective, but this is rare and is considered only after other components are verified.
Replacing the PCM is rarely necessary; the issue is usually a failed pump, wiring problem, blown fuse, or bad relay, which are far more common causes.
Yes, once the pump can maintain proper pressure, shifting should return to normal; however, a lingering fault may require clearing the code and a test drive.
Warranty coverage depends on the vehicle’s age, mileage, and manufacturer policies; the diagnostic process will determine if the repair qualifies.
In most designs the pump is external to the transmission housing, so fluid does not need to be drained, but some models may require partial drainage for access.