C0903TPMS Sensor 2 Position Performance
- Generic OBD-II code · Chassis
- Needs a drive cycle to confirm a fix
- How the car detects it
- Searches found C0903 neither in code lists nor in maker documents; a single NHTSA hit is a truck maker's campaign number. The title addresses locating transmitter 2 on the vehicle. Two methods are documented. A Ford patent puts a low frequency initiator into each wheel well: the controller fires it above about 20 mph, waits 3 seconds for the sensor to answer with its ID and a special status flag, raises the transmit power step by step and declares an error once the limit is reached without reply. A 2022 Mitsubishi system without initiators derives the position from the timing between the wheel speed sensors and each tire sensor. If either check ends without a clear match, the corner of sensor 2 stays unknown.
- What you may notice
- TPMS lamp on with all tires correctly inflated
- Display shows pressures without assigning them to wheel positions
- Likely causes
- LikelyLocation learning interrupted, e.g. short trips at low speed after tire service
- PossibleSensor does not answer the wheel well initiator (weak LF field, misaligned initiator)
- RareAcceleration or rotation detection inside the sensor faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.