P0889TCM Power Relay Sense Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Some gearboxes draw their power through a relay, such as the transmission control relay in Chrysler's fuse box that feeds the solenoids. P0885 to P0887 cover the coil control of that relay, P0888 to P0892 its sense line, which reads back the switched output and compares it with the command. A dead relay leaves all solenoids without power, so the gearbox drops into its hydraulic emergency gear. P0889 means the read-back voltage does not fit the switching state or the system voltage: clearly below battery voltage, a voltage drop across the contact or a delayed drop-out. No maker publishes a strategy.
- What you may notice
- MIL or gearbox warning
- Occasional limp mode
- Likely causes
- LikelyRelay contact with high resistance
- PossibleMoisture or corrosion in relay or socket
- PossibleGround or supply problem
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.