P215B code meaning
Vehicle Speed - Output Shaft Speed Correlation
Powertrain system Generic code P21xx codes Check engine light
What P215B means
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.
P215B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P215B
- 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)
Common causes of P215B
- Most 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)
- Less likelyLost speed message from another module on the data bus
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Vehicle speed sensorOutput shaft speed sensorWheel speed sensor
What each part of P215B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 1 | Area: fuel and air metering. |
| 5B | The exact fault in that area. |
What to do next
- Note P215B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P215B
What does P215B mean?
P215B means "Vehicle Speed - Output Shaft Speed Correlation". P215B checks whether the vehicle speed, as the control unit has chosen it, matches the speed implied by the transmission output shaft. It is a generic code, so it means the same on every make.
Is it safe to drive with P215B?
Drive gently and only to a workshop. With P215B the car can go into limp mode (reduced power) to protect itself.
Will P215B fail an emissions test?
Yes, it can. P215B is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P215B to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P215B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.