C0901 — TPMS Sensor 1 Position Performance
The tire pressure monitoring receiver cannot reliably localize sensor 1 to a wheel position. Pressure values may be assigned to the wrong wheel until relearn is completed.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Tpms sensor
- Tpms receiver
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Position relearn required after rotation
- Weak sensor signal at receiver
Possible symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Related codes
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.