What it means
The supply voltage feeding injector group H 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-H supply.
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. The control module monitors the voltage available to this injector group. P217E sets when that voltage is below the expected range, which can cause group-H injectors to cut out or operate inconsistently.
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
- Save freeze-frame data and check for group-H injector and misfire codes to see when the low-supply event occurred.
- Inspect the group-H fuse, relay, wiring, and connectors for corrosion, chafing, loose pins, or heat damage.
- Measure voltage at the group-H feed and across its connections with the circuit operating, comparing results with the manufacturer's specification to find voltage drop.
- Check the fuse, relay contacts, and circuit ground for excessive resistance or an intermittent connection.
- If the external supply circuit checks out, test the module connector and output using the manufacturer's diagnostic procedure.
Common fixes
- Clean or repair corroded group-H connector terminals.
- Repair chafed or damaged group-H supply wiring.
- Replace a faulty fuse or relay after identifying the cause.
- Repair a poor ground or loose connection in the supply circuit.
- Repair or replace a confirmed faulty module output.
Can I keep driving?
Low voltage to group H can cause misfires, rough running, and reduced power. Limit driving and avoid heavy loads; stop if the engine misfires severely, fuel smell is strong, or exhaust smoke appears.
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.