P0276 Code - Cylinder 6 Injector Circuit Low

Discussion in 'P - Powetrain Codes' started by fault code, Dec 23, 2017.

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    fault code Administrator Staff Member

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    What Does P0276 Mean?

    This code gets stored by the vehicle’s PCM (Powertrain Control Module) when the fuel injector for the #6 cylinder is experiencing low voltage. In other words, it’s unable to work correctly.

    The code can also be indicative of other problems – or potential problems – too. That’s because, when a fuel injector isn’t working correctly, it sets off a chain reaction. In fact, the engine’s operating parameters will literally change because of just one fuel injector’s suboptimal performance.

    This makes sense. If a fuel injector isn’t supplied with sufficient energy, then its spray pattern is going to decrease. The result of that will be a lean mixture of fuel. Thus begins the ripple effect. In today’s modern cars, the PCM will quickly realize that one of the fuel injectors is underperforming and react by enriching the fuel mixtures for the other cylinders. While it keeps the vehicle working, its fuel economy plunges.

    It gets worse, though, because the cylinder with the lean mixture will soon experience higher temperatures in its head. The result of this will be detonation which will be picked up by the knock sensor. This time, the PCM reacts by slowing down the cylinder’s timing. Once again, this measure allows the vehicle to keep working, but now the engine’s power takes a hit.

    We could continue, but hopefully the enormity of what this code represents is understood.

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    What are the common causes of P0276 ?

    The most common cause of this code is damage to wiring caused by wildlife. The warm area atop the engine provides shelter for small animals, where they proceed to gnaw the wiring for some strange reason. Other causes include a faulty fuel injector, clogged fuel injector, corroded or loose electrical wiring or connector faces, or a faulty fuel injector driver in the PCM.

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    How do you troubleshoot P0276 ?

    If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

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