P0271 Code - Cylinder 4 Injector Circuit High

What Does P0271 Mean?

OBD-II Code P0271 is defined as a Cylinder 4 Injector Circuit High

The engine control module (PCM) has special transistors called "drivers" to turn the Fuel Injectors on and off in the Fuel Injection System. If the PCM cannot control the fuel injector, it will set code P0271.

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What are the common causes of P0271 ?

• An air leak forward of the DPF will change the sensor readings resulting in the code
• Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
• Dirty air cleaner element Damaged DPF

What are the symptoms of P0271 ?

Symptoms of a P0271 diagnostic trouble code may include:

• Blown fuse (if applicable)
• Engine surge
• Reduction in engine performance, especially at low RPM levels
• The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

How do you troubleshoot P0271 ?

Deactivation of cylinders is achieved by releasing a synchroniser pin that normally interlocks the cam follower and rocker arms. P0271 code resolves the synchroniser pin is released using hydraulic pressure which is controlled by a dedicated solenoid.

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