P217C

Code

Generic P — Powertrain

Fuel Injector Group G Supply Voltage Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 29 EN: 31 RU: 24

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Short to battery voltage on injector group G supply or control circuit
Corroded, loose or damaged injector harness connector(s)
Faulty fuel injectors with internal short or leakage to supply
Blown or incorrect fuse or supply relay affecting the injector rail
Faulty ECM or driver transistor/power stage on the ECM
Poor ground or high-resistance ground for the injector power rail

Symptoms

Illuminated MIL (Check Engine Light)
Poor running, rough idle or misfire under certain conditions
Reduced engine power or hesitation when affected injectors are commanded
Hard starting or stalling
Possible fuel trim abnormalities for affected bank/group

What to check

Retrieve freeze frame and live data with a scan tool; note conditions when code set
Check for additional injector or misfire codes (P0200–P0208, etc.)
Visually inspect wiring and connectors for damage, corrosion, pin push-out, or melted insulation in the group G harness
Check fuses and relays for the fuel injector power rail
Measure battery voltage and compare to measured voltage at the injector power feed
Backprobe injector connector(s) with a multimeter or oscilloscope to monitor supply and control signals while cranking and running

Signal parameters

Expected supply rail (injector battery feed): nominal battery voltage ~11–14.5 V with engine running
Control signal: pulsed ground or low-side drive; when inactive control line normally near supply (if high-side fed) or near 0 V (if low-side driven) depending on architecture — consult vehicle wiring
Typical injector pulse width: ~1–12 ms depending on load (varies by engine and RPM)
A 'high' fault indicates voltage on the driver/control line is higher than the ECM's upper threshold or above expected rail; sustained readings above normal battery voltage (e.g., >15 V) or stuck near battery when the driver should pull low are indicative
Oscilloscope patterns: look for expected pulsed waveform; a flat high or abnormal amplitude indicates fault

Diagnostic algorithm

Use a scan tool to confirm P217C is current and review freeze-frame (engine rpm, temp, throttle position, vehicle speed).
Disconnect battery if required by manufacturer, then visually inspect harness and connectors for group G injectors and the common injector power feed for damage, pin corrosion, or pushed-out terminals.
With ignition ON (engine OFF) backprobe the injector group power feed and individual injector control pins: compare voltage to battery and note any unusually high readings.
Start engine and observe injector control waveform with an oscilloscope or high-speed voltmeter. Verify pulsed control and that driver pulls line low (or high depending on architecture) when commanded.
Measure DC resistance of each injector in group G (engine off, injector disconnected). Abnormally low resistance suggests an internal short; open/infinite suggests open circuit. Compare to service spec.
Wiggle-test harness while monitoring voltage/waveform to reproduce intermittent faults from chafed wiring or loose connectors.
If wiring and injectors check good, check ground integrity for the ECU and injector power feed — measure voltage drop on ground under load.
Swap injectors between groups (if applicable) and re-scan: if the code follows the injector(s), suspect the injector(s); if it remains on the same group position, suspect wiring or ECM driver.
If evidence points to driver or ECM, confirm with bench tests per OEM procedure or consult replacement/ECM fault isolation steps before replacing the module.
After repairs, clear codes and perform a road or functional test to ensure the fault does not return.

Likely causes

Wiring short to constant B+ (battery) in harness for group G
Connector corrosion/loose pin at injector connector or power distribution
Failed injector(s) in group G (internal shorted coil)
Defective injector driver in the ECM or external power module
Intermittent contact from chafed wiring contacting chassis or other powered circuit