Fuel Injector Group Supply Voltage Circuit High
The P2151 code indicates that the powertrain control module (PCM) has detected a voltage higher than the specified range in the fuel injector group supply voltage circuit. This circuit provides power to the injectors, and an overvoltage condition can be caused by a faulty injector driver, a short to voltage in the wiring, or a malfunctioning PCM. High voltage can damage injectors and other components.
1. Most Common Causes
- Faulty fuel injector driver module
- Short to voltage in injector supply circuit
- Failed PCM (Powertrain Control Module)
- Corroded or damaged wiring/connectors
2. Symptoms You Will Notice
- Check Engine Light on
- Engine misfire or rough idle
- Poor fuel economy
- Engine stalling or hesitation
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect injector wiring and connectors for damage or corrosion.
Step 3: Use a multimeter to check voltage at injector supply circuit; compare to manufacturer specs.
Step 4: Test injector driver module output; replace if out of range.
Step 5: If all else fails, check PCM for internal faults or reprogram.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as high voltage can damage injectors and the PCM, leading to costly repairs. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs vary from $150 to $400 depending on the cause. Wiring repairs are cheaper; PCM replacement is more expensive.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.