Fuel Injector Group Supply Voltage Circuit/Open
The P2155 code indicates that the powertrain control module (PCM) has detected an open or short circuit in the supply voltage circuit for a group of fuel injectors. This typically affects multiple injectors sharing a common power feed, often from a fuse or relay. The PCM monitors voltage on the injector driver circuits; when it sees a voltage drop or no voltage when expected, it sets this code. This can cause lean misfires, rough idle, and reduced power.
1. Most Common Causes
- Blown fuse in the injector power supply circuit
- Faulty fuel pump relay or injector relay
- Open or cut wiring in the harness for injector group 'D'
- Corroded, loose, or disconnected electrical connector
- Internal ECM/PCM failure in the injector circuit driver
- Excessive resistance in voltage supply circuit connections
2. Symptoms You Will Notice
- Check Engine Light on
- Engine misfire or rough idle
- Poor acceleration or hesitation
- Increased fuel consumption
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect injector harness, connectors, and fuses/relays.
Step 3: Use a multimeter to check voltage at injector group power supply (should be battery voltage with key on).
Step 4: Check continuity and resistance in injector circuits; repair open or short as needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the engine may run poorly, stall, or cause catalytic converter damage due to unburned fuel.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and repair, but could be higher if the PCM needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.