DTC P0945 is triggered when the ECU detects an electrical problem in the hydraulic pump relay circuit. Often referred to as the transmission pump, it is one of the most important transmission components in your gearbox. Therefore, this OBDII fault code must be diagnosed immediately.
How severe is the code?
Diagnostic code P0945 is extremely severe because the transmission pump creates the hydraulic pressure that turns your wheels. If there is a problem with the transmission pump relay, you may experience a number of driving issues while causing significant or catastrophic transmission damage.
Symptoms
Symptoms of a P0945 include:
- Unusually harsh shifts
- Transmission slipping between gears
- Failed gear change
Causes
- Low or dirty transmission fluid
- Damaged wiring or connectors
- Faulty hydraulic pump relay
- ECU or TCM issues
How to diagnose the code?
The first step in diagnosing an OBDII fault code P0945 is to check the transmission fluid level and condition. Then, the technician should look for any damaged wiring or corroded connectors between the relay panel and the transmission. The hydraulic pump relay/transmission pump relay will also need to be tested.
What repairs will fix P0945?
- Change the transmission fluid/filter
- Repair or replace damaged wiring and/or connectors
- Replace the hydraulic pump relay
- Reprogram or replace the ECU/TCM