P0271 2016 Chevrolet Silverado Code - Cylinder 4 Injector Control Circuit High Voltage

P0271 indicates a high voltage issue in the Cylinder 4 Injector Control Circuit, meaning the engine control module (ECM) has detected an abnormal electrical signal from the injector.

Symptoms include rough idling, reduced engine performance, misfiring in Cylinder 4, increased fuel consumption, and potentially the check engine light being illuminated.

Possible causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a short circuit, or a malfunctioning engine control module (ECM).

Driving with this code is not recommended, as it can lead to poor engine performance, increased emissions, and potential damage to the catalytic converter over time.

Diagnosis involves inspecting the Cylinder 4 injector for damage, checking the wiring and connectors for corrosion or shorts, and using a scan tool to monitor injector voltage and operation.

Repairs may involve replacing the faulty injector, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if needed.

Repair costs vary, but replacing a fuel injector can cost $200–$400, while wiring repairs or ECM replacement may increase the cost depending on labor rates.

Yes, a malfunctioning fuel injector in Cylinder 4 is a common cause of this code and should be inspected first during diagnosis.

You’ll need an OBDII scanner, a multimeter for electrical testing, and possibly a noid light to check injector pulse.

Clearing the code may turn off the check engine light temporarily, but it won’t resolve the underlying issue. Proper diagnosis and repair are necessary to fix the problem permanently.