Fuel Injector Group Supply Voltage Circuit/Open
The P216A code indicates that the powertrain control module (PCM) has detected an open or high resistance in the supply voltage circuit for a group of fuel injectors. This circuit provides battery voltage to the injectors, and when the voltage is too low or missing, the injectors may not operate properly, leading to engine performance issues. The code is often triggered by wiring problems, blown fuses, or faulty relays.
1. Most Common Causes
- Blown fuse or fusible link for injector power supply
- Open or shorted wiring in the injector power circuit
- Faulty injector driver module or relay
- Corroded or loose connectors at injectors or PCM
2. Symptoms You Will Notice
- Engine misfire or rough idle
- Check Engine Light illuminated
- Reduced engine power or stalling
- Hard starting or no start condition
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the injector power supply fuse and relay; replace if blown.
Step 3: Test voltage at the injector harness connector with a multimeter (should be battery voltage with key on).
Step 4: Check continuity and resistance in the wiring from the fuse/relay to the injectors and PCM.
Step 5: If wiring is intact, test the injector driver module or PCM output for proper voltage.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause engine misfires, stalling, and potential damage to the catalytic converter. Have the vehicle diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts like fuses, relays, or wiring repairs. If the PCM or injector driver module needs replacement, costs can be higher.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.