P215BVehicle Speed - Output Shaft Speed Correlation
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P215B checks whether the vehicle speed, as the control unit has chosen it, matches the speed implied by the transmission output shaft. GM uses it widely in hybrids and EVs. The 2011 Volt tables set it, Type A with MIL after one trip, when wheel-based and output-shaft-based speed differ by more than 6.21 mph or when no secured speed source remains, counted over 400 of 800 samples of 25 ms. In the 2019 hybrid tables three sources are compared, output shaft, wheel sensors and motor speeds, and the code sets after 0.15 s when two of them disagree by more than 12.42 mph. GM bulletin 22-NA-089 links P215B on the 2017–2019 Bolt EV to a broken drive shaft washer damaging the wheel speed sensor, which is to be replaced. FCA lists P215B for the Pacifica Hybrid and fixes it with hybrid controller software.
- What you may notice
- Check engine light on after one trip
- ABS, traction or stability lamps, systems switched off for the drive
- Clicking noise from a front wheel (Bolt EV)
- Likely causes
- LikelyDamaged wheel speed sensor (GM Bolt EV broken anti-click washer)
- PossibleFaulty transmission output speed sensor or its wiring
- PossibleHybrid or transmission control software (FCA Pacifica Hybrid)
- RareLost speed message from another module on the data bus
- 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: €60 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.