OBD-II Generic Error Code P2152: How to Fix It

Q: Can I drive my car with a P2152 code?

It is not recommended to drive long distances with an active P2152 code. While the vehicle may still run, the affected injector group may not be delivering fuel correctly, which can cause misfires, rough running, increased exhaust emissions, and potential catalytic converter damage over time. Short, careful trips to a repair shop are generally acceptable, but extended driving should be avoided until the fault is resolved.

Q: What causes a P2152 fuel injector group C supply voltage fault?

The most common causes include a blown fuse or failed relay supplying the injector circuit, corroded or damaged wiring and connectors at the injectors, a poor ground connection in the injector or ECM circuit, a shorted or open-circuit fuel injector dragging down the supply voltage, and in rare cases, a failing ECM output driver. A weak battery or failing alternator can also trigger this code by causing system-wide voltage instability.

Q: How do I know which cylinders are in injector group C?

Injector grouping varies by vehicle make, model, and engine configuration. Group C typically refers to a specific set of cylinders as defined by the manufacturer's firing order and wiring layout. You will need a vehicle-specific wiring diagram or factory service manual to identify exactly which injectors belong to group C on your engine. Many online resources and repair databases (such as ALLDATA or Mitchell1) provide this information by VIN or vehicle selection.

Q: Will P2152 clear itself after fixing the problem?

No, OBD-II fault codes do not clear themselves automatically after a repair. You must use an OBD2 scanner to manually clear the stored code after completing all repairs. Once cleared, the ECM will re-run its diagnostic monitors during normal driving. If the underlying fault has been properly fixed, the code will not return. If it does return, further diagnosis is needed.

Q: How much does it cost to fix a P2152 error code?

Repair costs vary widely depending on the root cause. Replacing a blown fuse costs almost nothing. A new relay typically costs $10–$30. A single fuel injector replacement can range from $50–$200 for the part alone, with labor adding $100–$300 or more depending on the engine layout. Wiring harness repairs vary greatly by severity. ECM replacement or repair is the most expensive option, potentially $500–$1,500 or more. Getting a professional diagnostic first (typically $100–$150) can save money by pinpointing the exact cause before purchasing parts.

Abstract

Error code P2152 indicates a problem with the supply voltage circuit for fuel injector group C — a specific bank of injectors responsible for delivering fuel into the engine cylinders. The Engine Control Module (ECM) has detected that the voltage feeding this injector group is outside the expected range, which can cause rough idling, misfires, or poor engine performance. Left unaddressed, this fault can lead to incomplete combustion, increased emissions, and potential damage to the engine or fuel system components.