OBD-II code · Powertrain (generic)
P0888 TCM Power Relay Sense Circuit
The TCM power relay reports a sense circuit condition. TCM supply control is impaired.
Is it safe to drive with P0888?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyFeedback wire fault
- PossibleRelay contact aged
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
- Tcm Power Relay, Wiring Harness, Tcm
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.