P217C: Fuel Injector Group G Supply Voltage Circuit High

P217C means the group G injector supply, cylinder 7 on GM's direct-injection V8 engines, is pulled up to supply voltage. GM tests this while the high-side driver is off: if the line sits within 1 V of the controller supply, the module treats it as shorted to power. The tables 16OBDG07A (2016), 18OBDG03A for the 6.2 LT4 and 19OBDG03A apply the same counting of 10 failures out of 20 samples, 100 ms apart, at 11 V or more, and treat it as type A with immediate MIL. A wire rubbed against a powered circuit, a damaged injector connector and, more rarely, a faulty driver inside the module are the usual causes; a module fault often shows as several high codes at once. To protect the injector from staying open, cylinder 7 is shut off. P217B is the low counterpart, P217A the general code.

Symptoms

• Check engine lamp on immediately
• Cylinder 7 misfire

Most likely causes

• Cylinder 7 feed shorted to a powered wire
• Damaged or wet injector connector
• Engine control module driver fault

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the connector and wiring of the injector indicated
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Measure the resistance and compare it with the manufacturer's specification
4. Check the control signal with an oscilloscope; on direct injection or diesel engines, leave this to a repair shop because of the high voltages
5. On diesels, check the per-cylinder injection corrections

Good to know

• Repair difficulty: hard
• It can trigger limp mode.
• It affects emissions.

What each character of P217C means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 1: Air and fuel
• 7C: Specific fault in that system

Frequently asked questions

Can I keep driving with code P217C?

Drive as little as possible and go to a repair shop. If you smell fuel or the engine is shaking badly, do not keep driving.

What causes code P217C?

The most common causes are: cylinder 7 feed shorted to a powered wire; damaged or wet injector connector; engine control module driver fault.

Related codes

• P217AFuel Injector Group G Supply Voltage Circuit/Open
• P217BFuel Injector Group G Supply Voltage Circuit Low
• P217FFuel Injector Group H Supply Voltage Circuit High
• P0280Cylinder 7 Injector A Circuit High
• P0307Cylinder 7 Misfire Detected

Sources

• gsi.ext.gm.com: 16OBDG07A Engine Diagnostics
• gsi.ext.gm.com: 18OBDG03A Engine Diagnostics
• gsi.ext.gm.com: 19OBDG03A Diagnostics

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.