OBD-II code · Powertrain (generic)
P0890 TCM Power Relay Sense Circuit Low
The TCM monitors the output side of its power relay; when the sense voltage is below threshold while relay is commanded closed, this code sets.
Is it safe to drive with P0890?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyRelay failed open
- PossibleOpen wiring at sense input
- Less likelyConnector pins corroded - high contact resistance
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
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Tcm Relay, Wiring Harness, Tcm
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.