What it means
The supply voltage on injector group F is above the upper limit. Overvoltage on the group-F supply can mis-time or damage the injectors. Causes: charging-system overvoltage, a stuck supply relay or regulator, or a wiring fault shorting the group-F supply to a higher voltage.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Injector group F is a set of fuel injectors supplied by a shared electrical feed. The powertrain control module monitors that feed and sets P216F when its voltage exceeds the allowed range, which can disrupt injector operation or expose the injectors and control circuitry to damaging voltage.
Common causes
Most likely first.
- Charging system overvoltage
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
Symptoms
- Check engine light on
- Misfire or rough idle on the affected cylinder
- Increased fuel consumption
- Possible fuel smell or smoke from exhaust
How to diagnose it
- Record freeze-frame data and identify the cylinders served by group F to see whether symptoms coincide with the high-voltage reading.
- Inspect group F’s connectors, wiring, and supply relay for corrosion, pin damage, chafing, or a supply wire touching a higher-voltage source.
- Measure charging-system voltage under the conditions recorded in the freeze frame and compare it with the manufacturer’s specification to check for system-wide overvoltage.
- Measure voltage at the group F supply and compare it with the manufacturer’s specification, checking whether the high reading is present only on that circuit.
- If overvoltage is limited to group F, isolate the relay and harness using the wiring diagram to locate a stuck relay or short to a higher-voltage feed.
Common fixes
- Repair a group F supply wire shorted to a higher-voltage source.
- Clean or repair corroded, loose, or damaged group F connector terminals.
- Replace a confirmed stuck injector supply relay.
- Repair the charging system if its output is above the manufacturer’s specification.
Can I keep driving?
Avoid driving if the engine misfires, runs roughly, or produces fuel smell or smoke, since poor combustion can damage the catalytic converter. Have the charging or injector supply overvoltage diagnosed promptly because continued excess voltage can damage electrical components.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.