Faulty fuel injector with an internal short to power; Damaged or chafed wiring harness in the injector supply circuit; Corroded or loose electrical connector at the injector or PCM; Failed PCM driver for the injector group; Aftermarket accessories improperly wired into the injector circuit; Moisture intrusion into the wiring harness or connectors

DTC codes / P21xx · Fuel and air metering / P216F

P216FFuel Injector Group F Supply Voltage Circuit High

Q: What does code P216F mean?

Fuel Injector Group F Supply Voltage Circuit High. P216F indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the supply circuit for fuel injector group F, which is a set of injectors grouped together by the manufacturer's control strategy. The PCM monitors the voltage on the injector driver circuit and sets this code when the voltage exceeds the expected range, typically indicating a short to power or an open circuit in the supply side.

P216F indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the supply circuit for fuel injector group F, which is a set of injectors grouped together by the manufacturer's control strategy. The PCM monitors the voltage on the injector driver circuit and sets this code when the voltage exceeds the expected range, typically indicating a short to power or an open circuit in the supply side.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Rough idle or misfire if the affected injector group is not firing correctly
Reduced engine performance or power loss under load
Poor fuel economy due to incorrect fuel delivery
Possible engine hesitation or stalling when accelerating

Common causes, most likely first

Faulty fuel injector with an internal short to power
Damaged or chafed wiring harness in the injector supply circuit
Corroded or loose electrical connector at the injector or PCM
Failed PCM driver for the injector group
Aftermarket accessories improperly wired into the injector circuit
Moisture intrusion into the wiring harness or connectors

How to diagnose and fix it

Inspect the injector group F wiring harness and connectors for visible damage, corrosion, or loose pins
Disconnect the injectors in group F and check for a short to power on the supply circuit using a multimeter
Test each injector's resistance and compare to specifications to identify a faulty injector
Check for continuity and voltage drop across the supply circuit from the PCM to the injectors
Inspect for aftermarket wiring or accessories that may be tapping into the injector circuit
If the circuit tests good, test the PCM driver output with an oscilloscope or substitute a known-good PCM
Repair or replace damaged wiring, connectors, or injectors as needed, then clear the code and verify

Injector Group F Supply Circuit Pitfalls

A high voltage code on an injector supply circuit often results from a short to power rather than a failed injector, so testing the circuit before replacing parts saves time and money.
Some manufacturers group injectors in pairs or banks for control and diagnostics, so group F may not correspond to a single physical injector, and the fault may affect multiple cylinders.
A loose ground connection for the PCM or engine can cause erratic voltage readings on injector circuits, leading to false high-voltage codes.
Aftermarket alarm systems or remote starters that tap into injector wiring are a common cause of this code, especially if installed poorly.
The code may set intermittently due to vibration or temperature changes, so a wiggle test of the harness while monitoring live data can reveal the fault.

Can I keep driving with P216F?

If the check engine light is on but the engine runs smoothly, you can drive cautiously to a repair shop, but avoid heavy acceleration or towing. If the engine misfires, runs rough, or loses power, stop driving and have the vehicle towed to prevent damage to the catalytic converter or engine.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.