What it means
The supply rail to injector group H is open, so none of the injectors in this group can fire. The affected cylinders produce no power and the engine runs rough or on reduced cylinders. Causes: a broken supply wire, an open relay or fuse, or a disconnected group-H supply connector.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
This code concerns the shared supply-voltage circuit for fuel injector group H; H identifies a group, not an individual cylinder. The control module monitors whether that supply circuit is electrically present. P217D sets when the circuit is open, so the group-H injectors may lose power and their cylinders may misfire.
Common causes
Most likely first.
- Open supply wire or blown fuse
- Pin pushed back out of connector body
- Cracked solder joint inside the module or sensor
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 scan for group-H injector and misfire codes to establish which symptoms occurred when the open was detected.
- With the ignition off, inspect the group-H supply fuse, relay, wiring, and connectors for a break, disconnection, pushed-back pin, or heat damage.
- Use the wiring diagram to identify the group-H feed and check continuity through its fuse, relay, harness, and connectors with power isolated as specified by the manufacturer.
- Check for supply voltage at the group-H feed and compare it with the manufacturer's circuit information to locate where the feed is lost.
- If the external supply path is intact, inspect module connectors and test the group-H output or internal connection using the manufacturer's procedure.
Common fixes
- Replace a blown fuse after correcting the cause of the open.
- Reconnect the group-H plug or repair a pushed-back terminal.
- Repair a broken section of group-H supply wiring.
- Replace a failed supply relay after confirming the fault.
- Repair an internal module connection only after verifying the external circuit.
Can I keep driving?
An open group-H supply can disable several injectors and leave the engine rough or down on power. Avoid driving if it misfires heavily or fuel smell or smoke is present, because unburned fuel can overheat the catalytic converter.
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.