Fuel Injector Group Supply Voltage Circuit/Open
Code P2146 indicates a fault in the supply voltage circuit for a group of fuel injectors, typically on bank 1. The PCM detects an open or short in the common power feed to injectors 1, 2, or 3 (or similar group). This can cause injectors to not fire properly, leading to misfires, rough idle, and poor performance. The issue is often due to wiring damage, corroded connectors, or a failed injector driver in the PCM.
01. Most Common Causes
- Open or short in injector group power supply circuit
- Faulty injector driver in PCM
- Corroded or damaged wiring/connectors
- Blown fuse or relay for injector power
02. Symptoms You Will Notice
- Engine misfire or rough idle
- Check Engine Light on
- Reduced engine power and poor acceleration
- Hard starting or stalling
03. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P2146 is present.
Step 2: Inspect wiring and connectors for the injector group for damage or corrosion.
Step 3: Test injector power supply voltage with a multimeter (should be battery voltage with key on).
Step 4: Check injector driver circuit using a test light or oscilloscope.
Step 5: If wiring is good, suspect PCM failure and test/replace as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, driving with P2146 can cause engine misfires, reduced performance, and potential catalytic converter damage. It's best to have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Repair costs vary: simple wiring repairs $50-$150, PCM replacement $500-$1000+. Diagnostic fees are typically $100-$150.