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P0276 OBD-II Trouble Code: Intermediate Shaft Speed Sensor C Circuit

Check Engine Light

P0276 code definition

The P0276 code is defined as the #6 injector circuit having a low voltage.

What the P0276 code means

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.

What causes the P0276 code?

There are a handful of reasons that could be behind P0276:

  • A dirty fuel injector
  • A plugged fuel injector
  • A faulty fuel injector
  • The fuel injector connector is loose or corroded
  • The fuel injector harness is either open or short

As you can see, all of these common causes have to do with the #6 cylinder’s fuel injector. The only other reason worth considering would be that the PCM is faulty, but this is extremely rare.

What are the symptoms of the P0276 code?

If the P0276 code has been stored, then the Check Engine Light should have come on. The other symptoms were documented earlier. They would include:

  • A lack of power coming from the engine
  • The engine runs rougher
  • Fuel economy plummets

How does a mechanic diagnose the P0276 code?

Fortunately, diagnosing this problem is fairly easy. Once a mechanic uses an OBD-II scanner to confirm the P0276 code was logged, they’ll examine the fuel injector and its harness. If necessary, they’ll follow the chain reaction to inspect the nature of any further damage.

Common mistakes when diagnosing the P0276 code

A big problem that mechanics make far too often is replacing or repairing the faulty fuel injector and then assuming that’s all that needed to be done. The P0276 code will clear, but as we covered at the beginning, a whole chain of problems could have resulted as well. Most of them should have their own OBD trouble codes, but a qualified mechanic will take the time to do other diagnostics just to make sure they didn’t miss anything.

How serious is the P0276 code?

This code should definitely be taken seriously. It’s not going to affect the vehicle to the point that those inside will be endangered, but if left untreated, an underperforming fuel injector will quickly become an expensive problem to repair. That’s not to mention how much it will cost the owner at the pump just to keep it moving.

What repairs can fix the P0276 code?

Fortunately, if caught early enough, common repairs are fairly simple and affordable:

Additional comments for consideration regarding the P0276 code

A technician should always check the other fuel injectors when there’s a problem with one of them. It could be that a bigger problem gets caught in its infancy.

Need help with a P0276 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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