Fuel Injector Group "A" Supply Voltage Circuit/Open
P2146 indicates an open or short circuit in Fuel Injector Group A, preventing proper electronic control of fuel delivery to those cylinders. The engine computer cannot establish the correct voltage or signal pathway to operate the injectors in this group, disrupting fuel spray timing and quantity.
What You Might Notice
- Check Engine Light illuminated
- Rough idle or engine stalling
- Loss of power during acceleration
- Poor fuel economy
- Engine misfires or hesitation
Most Common Causes
- 1
Fuel injector electrical connector issue
Loose, corroded, or damaged connector on the Group A fuel injectors preventing proper signal transmission. Water intrusion or corrosion can degrade the connection.
- 2
Defective fuel injector
One or more injectors in Group A has failed internally or has an open winding, breaking the electrical circuit and preventing fuel delivery.
- 3
Wiring harness damage
Cut, pinched, or deteriorated wiring between the ECU and fuel injector Group A connectors interrupts signal transmission.
- 4
Fuel injector driver circuit failure
The ECU fuel injector driver module or relay responsible for controlling Group A injectors has failed internally.
How to Diagnose It
- 1
Check Fuel injector electrical connector issue — Loose, corroded, or damaged connector on the Group A fuel injectors preventing proper signal transmission. Water intrusion or corrosion can degrade the connection.
- 2
Check Defective fuel injector — One or more injectors in Group A has failed internally or has an open winding, breaking the electrical circuit and preventing fuel delivery.
- 3
Check Wiring harness damage — Cut, pinched, or deteriorated wiring between the ECU and fuel injector Group A connectors interrupts signal transmission.
- 4
Check Fuel injector driver circuit failure — The ECU fuel injector driver module or relay responsible for controlling Group A injectors has failed internally.
How to Fix It
- 1
Inspect and clean fuel injector connectors
Locate the Group A fuel injector connectors, disconnect them, and inspect for corrosion, water damage, or loose pins. Clean with electrical contact cleaner and reconnect firmly.
- 2
Test wiring harness continuity
Use a multimeter to check for continuity in the fuel injector wiring harness from the ECU to all Group A injector connectors. Repair or replace any damaged segments.
- 3
Replace defective fuel injector
Remove and test individual Group A fuel injectors for resistance and operation. Replace any injectors that measure out of specification or fail functional testing.
- 4
Service or replace ECU injector driver module
If wiring and injectors test good, the issue likely lies in the engine control unit's injector driver circuit. Have the ECU professionally tested or replaced.
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