OBD-II Generic Error Code P2146: How to Fix It

Q: Can I drive my car with a P2146 code?

Driving with a P2146 code is not recommended. If the fuel injector group A supply circuit has failed, one or more cylinders may not receive fuel, causing misfires, loss of power, poor fuel economy, and potential catalytic converter damage from unburned fuel. Drive only as necessary to reach a repair facility.

Q: What is the most common cause of the P2146 code?

The most common causes are a blown fuel injector fuse, a failed fuel injector power relay, or damaged and corroded wiring in the injector harness. These should be the first things you check before moving on to injectors or the PCM.

Q: Will P2146 cause my check engine light to come on?

Yes. P2146 is stored in the PCM and will trigger the check engine light. In some cases, if the fault is severe enough, the vehicle may enter a reduced power or limp mode to protect the engine.

Q: How much does it cost to repair a P2146 code at a shop?

Repair costs vary widely depending on the root cause. A blown fuse repair may cost $50–$100 in labor. Wiring harness repair typically runs $150–$400. Replacing one or more fuel injectors can cost $200–$600 or more. PCM replacement and programming can range from $500 to over $1,200 depending on the vehicle.

Q: Is P2146 the same as P2149?

No, but they are closely related. P2146 refers to the supply voltage circuit for fuel injector group A (typically bank 1), while P2149 refers to fuel injector group B (typically bank 2). If both codes appear together, it may indicate a shared power supply fault such as a common fuse, relay, or PCM driver issue affecting both banks.

Abstract

The P2146 error code indicates a fault in the fuel injector group A supply voltage circuit, meaning the power supply line that feeds a specific bank of fuel injectors is not delivering the correct voltage. This can cause one or more cylinders to misfire, run rough, or fail to start entirely. Common causes include a blown fuse, a faulty fuel injector driver circuit in the PCM, damaged wiring, or a failed fuel injector power relay.