Fuel Injector Group Supply Voltage Circuit High
The P2151 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 through a fuse or relay. A high voltage condition can be caused by a short to voltage, a faulty injector driver, or a malfunctioning PCM. This issue can lead to improper fuel delivery, causing drivability problems and potential engine damage if not addressed.
01. Most Common Causes
- Short to voltage in the injector group supply circuit
- Faulty fuel injector driver module
- Malfunctioning PCM (Powertrain Control Module)
- Corroded or damaged wiring/connectors
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire or rough idle
- Poor fuel economy
- Engine stalling or hesitation
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Visually inspect the wiring and connectors for the fuel injector group supply circuit for damage, corrosion, or shorts.
Step 3: Measure the voltage at the injector group supply circuit with a multimeter; compare to manufacturer specifications.
Step 4: Check the fuel injector driver module and PCM for proper operation; replace if faulty.
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 engine misfires, poor performance, and potential damage to the catalytic converter or engine.
How much does it cost to fix?▼
The cost to diagnose and repair P2151 typically ranges from $50 to $150 for diagnosis, plus parts and labor for repairs, which can vary widely depending on the root cause.