Open or damaged wire in the fuel injector supply voltage circuit; Corroded or loose electrical connector at the injector or PCM; Failed fuel injector with an open internal coil; Blown fuse or faulty relay supplying power to the injectors; PCM internal fault (rare)

DTC codes / P21xx · Fuel and air metering / P216D

P216DFuel Injector Group F Supply Voltage Circuit/Open

Q: What does code P216D mean?

Fuel Injector Group F Supply Voltage Circuit/Open. P216D indicates that the powertrain control module (PCM) has detected an open circuit or abnormal voltage supply to the fuel injectors in Group F, which is a manufacturer-defined set of injectors. The PCM monitors the supply voltage circuit and sets this code when the voltage falls outside the expected range, typically indicating a break in the wiring or a faulty connection.

P216D indicates that the powertrain control module (PCM) has detected an open circuit or abnormal voltage supply to the fuel injectors in Group F, which is a manufacturer-defined set of injectors. The PCM monitors the supply voltage circuit and sets this code when the voltage falls outside the expected range, typically indicating a break in the wiring or a faulty connection.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Symptoms you may notice

Illuminated check engine light, often with no other symptoms
Engine misfire or rough running, especially under load
Reduced engine power or limp mode
Poor fuel economy
Difficulty starting or stalling
Noticeable decrease in performance

Common causes, most likely first

Open or damaged wire in the fuel injector supply voltage circuit
Corroded or loose electrical connector at the injector or PCM
Failed fuel injector with an open internal coil
Blown fuse or faulty relay supplying power to the injectors
PCM internal fault (rare)

How to diagnose and fix it

Check for any related technical service bulletins (TSBs) for the vehicle make and model
Inspect the fuel injector supply voltage circuit for visible damage, corrosion, or loose connections
Test the supply voltage at each injector in Group F with a multimeter and compare to specifications
Check the fuse and relay that provide power to the fuel injectors
Perform a resistance test on each injector in Group F to check for an open coil
If the circuit and injectors test good, diagnose the PCM and its connectors
Repair or replace the faulty wiring, connector, injector, or PCM as needed, then clear the code and verify

Don't overlook the injector supply circuit

Group F is not standardized across all manufacturers; consult the factory service information to identify which injectors are in this group.
A faulty ground connection for the injector circuit can cause this code even if the power side appears intact.
The code may be intermittent, so wiggle-test the wiring harness while monitoring live data to catch a loose connection.
Aftermarket electrical accessories or poor previous repairs can introduce voltage drops that trigger this code.
Replacing injectors without testing the circuit first often leads to a repeat failure if the root cause is wiring.

Can I keep driving with P216D?

Driving with this code is not recommended because it can cause engine misfire and reduced power, which may damage the catalytic converter over time. If the vehicle is running poorly, limit driving to a short distance to a repair shop.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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