OBD-II code · Powertrain (generic)
P0945 Hydraulic Pump Relay/Control Circuit/Open
The hydraulic pump relay/control circuit reports a circuit/open condition. Pump cannot be commanded reliably.
Is it safe to drive with P0945?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyOpen in relay control wire
- PossibleOpen relay coil
- Less likelyPin pushed back out of connector body
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Hydraulic Pump Relay, Wiring Harness, Tcm
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.