P2151: The fuel injector unit B power supply voltage is above normal
The fuel injector unit B power supply voltage is above normal. It usually comes from the battery, the alternator or a poor connection.
| Code | P2151 |
|---|---|
| System | Engine and transmission |
| Group | P21xx, Throttle, injection and emissions |
| Type | Generic: it means the same on every make |
How to read and clear P2151 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 P2151 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
- P214C The SCR NOx catalytic converter output temperature is above normal
- P214E The AdBlue pump A current is above normal
- P214F The AdBlue heater A current is above normal
- P2150 The fuel injector unit B power supply voltage is below normal
- P2152 The fuel injector unit C power supply voltage has a broken or disconnected wire
- P2153 The fuel injector unit C power supply voltage is below normal
- P2154 The fuel injector unit C power supply voltage is above normal
- P2155 The fuel injector unit D power supply voltage has a broken or disconnected wire
- 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 P2151 mean?
The fuel injector unit B power supply voltage is above normal. It usually comes from the battery, the alternator or a poor connection.
How do you clear P2151?
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, P2151 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.
