What it means
The supply voltage feeding injector group F has dropped below the lower limit. The injectors in this group lose drive voltage and may stop firing, so the cylinders they serve run lean or cut out. Causes: a blown fuse, a failed injector supply relay, a voltage drop in the supply harness, or a poor ground or connector on the group-F supply.
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 the voltage on that feed and sets P216E when it falls below the allowed range, which can leave the group’s injectors unable to operate reliably.
Common causes
Most likely first.
- Fuse, relay, or wiring fault on supply
- Connector pins corroded - high contact resistance
- Harness chafing through insulation
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 check which cylinders are associated with group F, since the affected cylinders help confirm the scope of the supply problem.
- With the engine off, inspect group F’s fuse, supply relay, connectors, grounds, and harness for corrosion, loose pins, chafing, or heat damage.
- Check the group F fuse and relay operation, then measure voltage at the group’s supply with the circuit loaded and compare it with the manufacturer’s specification.
- If voltage is low, measure voltage drop across the supply and ground paths to locate a resistive connection or damaged wire.
- If the wiring and supply components pass, use the vehicle’s wiring diagram and scan-tool data to check the control module’s supply-voltage monitor and related circuit.
Common fixes
- Replace a blown group F supply fuse after checking for a short or overload.
- Clean and secure corroded or loose group F supply and ground connections.
- Repair chafed or damaged wiring in the group F supply harness.
- Replace a faulty injector supply relay or other confirmed failed supply component.
Can I keep driving?
Avoid driving if the engine is misfiring, running roughly, or producing fuel smell or exhaust smoke; unburned fuel can damage the catalytic converter. If it runs smoothly, limit driving and arrange prompt diagnosis because group F injectors may cut out.
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.