Fuel Injector Group "C" Supply Voltage Circuit/Open
P2152 indicates an open or faulty circuit in Fuel Injector Group C, preventing proper fuel delivery control to those cylinders. The engine's fuel injection system relies on precise electrical signals to operate the injectors, and this code means the PCM cannot properly command or detect Group C injectors.
What You Might Notice
- Check Engine Light illuminated
- Rough idle or hesitation during acceleration
- Loss of power or reduced fuel efficiency
- Hard starting or extended crank time
- Cylinder misfires in affected bank
Most Common Causes
- 1
Fuel injector wiring harness open or corroded
Broken, loose, or corroded wiring connections to the Group C fuel injectors prevent proper electrical signal delivery. Inspect connectors for corrosion, moisture, or loose terminals.
- 2
Faulty fuel injector in Group C
One or more injectors in the Group C bank may have failed internally or have a shorted coil. Fuel injector resistance testing can identify which injector(s) are defective.
- 3
PCM or fuel injector driver module failure
The powertrain control module or dedicated fuel injector driver circuit may have lost the ability to command the Group C injectors. This typically requires specialized diagnostic equipment to confirm.
- 4
Open fuel injector supply voltage circuit
A break in the power supply circuit feeding voltage to Group C injectors will cause an open circuit fault. Check for blown fuses, damaged relay contacts, or broken wiring in the injector power supply.
How to Diagnose It
- 1
Check Fuel injector wiring harness open or corroded — Broken, loose, or corroded wiring connections to the Group C fuel injectors prevent proper electrical signal delivery. Inspect connectors for corrosion, moisture, or loose terminals.
- 2
Check Faulty fuel injector in Group C — One or more injectors in the Group C bank may have failed internally or have a shorted coil. Fuel injector resistance testing can identify which injector(s) are defective.
- 3
Check PCM or fuel injector driver module failure — The powertrain control module or dedicated fuel injector driver circuit may have lost the ability to command the Group C injectors. This typically requires specialized diagnostic equipment to confirm.
- 4
Check Open fuel injector supply voltage circuit — A break in the power supply circuit feeding voltage to Group C injectors will cause an open circuit fault. Check for blown fuses, damaged relay contacts, or broken wiring in the injector power supply.
How to Fix It
- 1
Inspect and repair fuel injector wiring
Check the wiring harness connecting to Group C fuel injectors for corrosion, cracks, or loose connections. Clean corroded terminals with electrical contact cleaner and reseat connectors firmly. Replace damaged wiring as needed.
- 2
Test and replace faulty fuel injectors
Use a multimeter to test fuel injector resistance (typically 10-14 ohms). Replace any injector that reads out of specification or shows no continuity. Ensure replacement injectors match OEM specifications.
- 3
Check fuel injector power supply and fuse
Locate the fuel injector fuse and relay in the vehicle's fuse box. Test that power is reaching the injector connectors with a multimeter set to voltage mode. Replace blown fuses or failed relays.
- 4
Test PCM with diagnostic scanner
Use a professional diagnostic scanner to perform injector balance tests and monitor fuel trim values. If injector driver tests fail or no voltage is present at the connector despite good wiring, the PCM may require reprogramming or replacement. Consult manufacturer technical information for your specific vehicle.
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