Fuel Injector Group Supply Voltage Circuit High
The P216C code indicates that the powertrain control module (PCM) has detected a voltage level in the fuel injector group supply circuit that is higher than the specified range. This circuit provides power to a group of fuel injectors, typically via a relay or fuse. A high voltage condition can be caused by a short to voltage, a faulty voltage regulator, or a malfunctioning PCM. This can lead to excessive fuel delivery, causing rich running conditions, poor fuel economy, and potential engine damage.
01. Most Common Causes
- Short to voltage in the injector group supply circuit
- Faulty fuel injector driver module or PCM
- Failed voltage regulator or alternator overcharging
- Corroded or damaged wiring/connectors in the injector power supply
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine running rich (black smoke from exhaust)
- Poor fuel economy
- Rough idle or misfire
- Possible engine hesitation or stalling
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data to confirm P216C.
Step 2: Visually inspect the fuel injector group wiring and connectors for damage, corrosion, or shorts.
Step 3: Measure voltage at the injector group supply circuit with a multimeter; compare to manufacturer specs (typically battery voltage).
Step 4: Check the fuel injector driver module or PCM for proper operation; test output signals.
Step 5: If voltage is high, isolate the circuit to find the short to voltage source (e.g., pinched wire, faulty relay).
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause excessive fuel delivery, leading to catalytic converter damage, engine misfire, or even hydro-lock. Have the vehicle diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost to fix P216C typically ranges from $150 to $400, depending on the root cause. Simple wiring repairs may be on the lower end, while replacing a PCM or injector driver module can be more expensive.