P21B8: The cold start cylinder 3 injection timing is not working properly
The cold start cylinder 3 injection timing is not working properly. It may be the part itself, its connector or the wiring.
| Code | P21B8 |
|---|---|
| System | Engine and transmission |
| Group | P21xx, Throttle, injection and emissions |
| Type | Generic: it means the same on every make |
How to read and clear P21B8 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P21B8 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P21B0 The AdBlue level sensor C gives a higher signal than normal
- P21B1 The AdBlue level sensor C fails now and then
- P21B6 The cold start cylinder 1 injection timing is not working properly
- P21B7 The cold start cylinder 2 injection timing is not working properly
- P21B9 The cold start cylinder 4 injection timing is not working properly
- P21BA The cold start cylinder 5 injection timing is not working properly
- P21BB The cold start cylinder 6 injection timing is not working properly
- P21BC The cold start cylinder 7 injection timing is not working properly
- P2100 Throttle actuator A control motor circuit open
- P2101 Throttle actuator A control motor circuit range or performance
- P2102 Throttle actuator A control motor circuit low
- P2104 Throttle control system: forced idle
What does code P21B8 mean?
The cold start cylinder 3 injection timing is not working properly. It may be the part itself, its connector or the wiring.
How do you clear P21B8?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P21B8 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
