P215AVehicle Speed - Wheel Speed Correlation
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P215A compares the vehicle speed used by the powertrain with the speed derived from the ABS wheel sensors and sets when the two disagree. Volvo and Mack trucks document it most clearly: with I-Shift or mDRIVE gearboxes the code appears once the difference exceeds 12 km/h (7.5 mph), and the advice is to verify the speed factor and the tyre size stored in the brake controller before testing sensors. A Volvo case traced P215A with throttle dropouts to a loose ABS module ground. GM's 2025 brake module tables use P215A, Type B with MIL after two trips, both when more than two wheel sensor signals look suspect at the same time and when the spread between fastest and slowest wheel exceeds about 52 mph while moving. Speedometer loss, cruise or traction faults follow. P215B and P215C compare against the output shaft.
- What you may notice
- Check engine light on
- Speedometer dropping out
- ABS, traction or cruise control warnings, power dropouts
- Likely causes
- LikelyTyre size or speed factor not matching the vehicle (common after tyre or axle changes)
- PossibleFaulty wheel speed sensor or damaged tone ring
- PossiblePoor ABS module ground or wiring fault in the speed signal path
- RareFault in the transmission-side vehicle speed source
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.