OBD-II Generic Error Code P2149: How to Fix It

Q: What does OBD-II code P2149 mean?

P2149 means the vehicle's computer (PCM) has detected a fault in the fuel injector Group B supply voltage circuit. This means the injectors on a specific bank of the engine are not receiving the correct voltage needed to fire properly, which can cause misfires, rough running, or a no-start condition.

Q: Can I drive with a P2149 code?

It is not recommended to drive with P2149 active. The affected injectors may not fire correctly, causing engine misfires that can damage the catalytic converter over time and result in poor performance or a potential no-start. Drive only as necessary to reach a repair location.

Q: What is the most common cause of P2149?

The most common causes are a damaged or corroded injector wiring harness, a blown fuel injector fuse or failed relay, a failed fuel injector with an open or shorted coil, or a poor PCM ground connection. Wiring and connector issues are the most frequent culprits.

Q: Will clearing the P2149 code fix it?

No. Clearing the code with a scanner only removes it from memory temporarily. If the underlying fault is still present, the code will return — usually within one or two drive cycles. You must diagnose and repair the root cause before clearing the code.

Q: How much does it cost to fix a P2149 code at a shop?

Repair costs vary widely depending on the root cause. A wiring repair or fuse replacement may cost $50–$200 in labor. Replacing one or more fuel injectors typically costs $150–$400 per injector including parts and labor. If the PCM requires replacement or reprogramming, costs can range from $500 to over $1,500 depending on the vehicle make and model.

Abstract

The P2149 error code indicates a fault in the fuel injector group B supply voltage circuit, meaning one or more fuel injectors in the secondary bank are not receiving the correct voltage from the powertrain control module (PCM) or injector driver circuit. This can cause rough idling, misfires, poor fuel economy, or a no-start condition. While some causes are simple wiring issues you can tackle yourself, others may require professional diagnostics and repair.