The P2146 code on your 2022 Lexus ES indicates a problem with the fuel injector group A supply voltage circuit. This code affects your ES's 2.5L 4-cylinder or 3.5L V6 engine's fuel injection system, signaling an open circuit condition in the power supply to one group of fuel injectors.
Understanding P2146 on Lexus ES
Modern fuel injection systems often group injectors for power supply purposes. Group A typically refers to one bank of cylinders or a specific set of injectors sharing a common power feed. Code P2146 sets when the ECM detects an open circuit in the power supply to this injector group, preventing those injectors from operating.
Common Symptoms
- Check engine light on
- Rough running or misfire
- Significant power loss
- Engine may run on fewer cylinders
- Strong fuel smell from unburned fuel
- Possible hard starting
- Catalytic converter may overheat
Primary Causes
- Blown injector fuse for group A
- Open circuit in injector supply wiring
- Damaged injector harness connector
- Faulty injector driver module
- ECM power circuit fault
- Corroded or melted connector
- Failed injector pulling down circuit
Diagnostic Procedure for 2022 Lexus ES
Start with the injector fuse - check the fuse box for the Group A injector circuit fuse. With key on, engine off, measure voltage at the Group A injector connector(s). Should have battery voltage. If no voltage, trace the power supply circuit back to fuse, relay, and ECM. If fuse is blown, check for short circuit before replacing. Inspect injector harness for damaged wiring or connectors.
Repair Solutions
Replace blown fuse if present - but first determine why it blew (shorted injector or wiring). Repair any open circuits found in the power supply wiring. Replace damaged connectors or harness sections. If an individual injector is shorted and causing fuse failure, replace that injector. Clear codes and verify all Group A injectors receive power and operate correctly.