Fuel Injector Group Supply Voltage Circuit/Open
The P2146 code indicates a fault in the supply voltage circuit for a group of fuel injectors, typically on engines with multiple injector groups (e.g., bank 1 or bank 2). This means the PCM has detected an open or short in the circuit that powers the injectors, often due to a blown fuse, damaged wiring, or a faulty injector driver. The issue can cause misfires, poor fuel economy, and potential engine damage if not addressed.
1. Most Common Causes
- Blown fuse or fusible link for injector group
- Open or shorted wiring in injector harness
- Faulty injector driver in PCM
- Corroded or loose connector at injector or PCM
2. Symptoms You Will Notice
- Engine misfire or rough idle
- Check Engine Light on
- Reduced engine power or hesitation
- Poor fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and check freeze frame data to identify affected injector group.
Step 2: Visually inspect injector harness and connectors for damage, corrosion, or loose pins.
Step 3: Test injector group fuse with a multimeter; replace if blown.
Step 4: Measure voltage at injector connector with key on; should be battery voltage. If not, trace wiring for open/short.
Step 5: If wiring and fuse are good, suspect PCM injector driver failure; perform injector balance test or consult professional.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a misfire can damage the catalytic converter and cause further engine issues.
How much does it cost to fix?▼
Typically $50-$150 for a fuse or wiring repair, but PCM replacement can cost $500-$1000.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.