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P0271 is a diagnostic trouble code (DTC) for "Cylinder 4 Injector Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Cylinder 4 Injector Circuit High
This diagnostic trouble code (DTC) indicates that a reference voltage from the fuel injector associated with cylinder number 4 has gone higher than the range of acceptance set by the vehicle manufacturer. The powertrain control module (PCM) realizes this and will store a trouble code.
The fuel injector associated with cylinder number 4 is restricted causing a pressure spike and therefore a higher reference voltage.
The wiring or connector associated with the fuel injector on the number 4 cylinder may be damaged in some way.
The powertrain control module could be malfunctioning.
A mechanic may diagnose this trouble code by first checking the fuel injector on the number 4 cylinder for proper function using the manufacturer’s suggested procedure.
Next, the mechanic would ensure the integrity of the wiring and connector associated with the fuel injector on cylinder number 4.
If everything checks out during these two tests:
The mechanic may run a fuel system cleaning through the engine to try to break any restrictions that may exist down inside the fuel injector.
If all else fails, the likelihood of the powertrain control module being faulty is high and it would therefore be tested and replaced as necessary.
An engine diagram is essential for diagnosing this issue due to the fact that it is easy to test the wrong fuel injector without it. Testing the wrong fuel injector would be a major mistake as it would certainly lead to a misdiagnosis and potentially hours of wasted time.
Any trouble code that can cause a misfire condition would be considered very serious and should be taken care of very soon. Misfires can cause damage to the engine and certain components of the exhaust system. Ensure that all repairs are done by a qualified professional as this repair relates to the fuel system.
Repairing or replacing wiring or connectors that are associated with the fuel injector on the number 4 cylinder
Replacing the fuel injector that is associated with the number 4 cylinder
Running a fuel system cleaning through the engine to release any restriction
Replacing the powertrain control module
Using quality fuel in your vehicle can help to prevent the restrictions that can build up inside the fuel injectors. Bad quality fuel can gunk up inside the fuel rail and cause multiple problems such as misfires and even a no start condition. Never use old or contaminated fuel in your vehicle.
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