Fuel Injector Group Supply Voltage Circuit/Open
The P2155 code indicates a problem in the supply voltage circuit for a group of fuel injectors. This typically means the voltage to the injector group is too low or the circuit is open, often due to a faulty injector driver, wiring issues, or a failed PCM. The injectors rely on a stable voltage supply to open and close properly; an open circuit prevents them from operating, leading to misfires and poor engine performance.
01. Most Common Causes
- Faulty fuel injector driver module
- Open or shorted wiring in the injector supply circuit
- Corroded or loose connector at the injector or PCM
- Failed PCM (Powertrain Control Module)
02. Symptoms You Will Notice
- Engine misfire or rough idle
- Check Engine Light illuminated
- Reduced engine power and poor acceleration
- Possible hard starting or no start condition
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the wiring and connectors for the injector group for damage, corrosion, or loose connections.
Step 3: Measure voltage at the injector group supply circuit with a multimeter (should be battery voltage with key on).
Step 4: Check resistance of the injector group circuit and compare to specifications.
Step 5: If wiring and voltage are okay, test the injector driver module or PCM per manufacturer procedures.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. Driving with P2155 can cause engine misfires, reduced power, and potential damage to the catalytic converter or engine. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and minor repairs like a connector or wiring fix. If the PCM or injector driver needs replacement, costs can exceed $500.