OBD-II code · Powertrain (generic)
P0942 Hydraulic Pressure Unit
The TCM detects a generic fault in the hydraulic pressure unit. Pump output, pressure regulation, or accumulator function impaired.
Is it safe to drive with P0942?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyHydraulic pump worn
- PossibleInternal leakage
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
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 3–10 h
- Emissions test
- Usually unaffected
- Parts involved
- Hydraulic Pressure Unit, Tcm
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.