C0903
TPMS Sensor 2 Position Performance
The tire pressure monitoring receiver cannot reliably localize sensor 2 to a wheel position. Pressure values may be assigned to the wrong wheel until relearn is completed.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: easy
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
Ordered by how often each turns out to be the cause.
- Position relearn requiredCommon
- Weak sensor signal at receiverPossible
Parts involved
- Tpms Sensor
- Tpms Receiver
C0903 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.