Fuel Injector Group "C" Supply Voltage Circuit Low
P2153 indicates the engine control module detected low voltage in the fuel injector Group C circuit, which controls fuel delivery to a specific set of cylinders. This fault prevents the injectors from operating at optimal efficiency and can cause rough running, hesitation, or poor fuel economy.
What You Might Notice
- Check Engine Light illuminated
- Rough idle or rough acceleration
- Hesitation during acceleration
- Reduced fuel economy
- Cylinder misfire or poor engine performance
Most Common Causes
- 1
Corroded or loose fuel injector connectors
Poor electrical connections at the fuel injector harness reduce voltage delivery to the injectors. Corrosion or loose pins prevent proper signal transmission from the PCM.
- 2
Damaged fuel injector wiring harness
A broken, shorted, or damaged wire in the fuel injector circuit reduces voltage supply. This can result from rodent damage, abrasion, or manufacturing defects.
- 3
Faulty fuel injector driver module or PCM
A defective injector driver circuit in the powertrain control module fails to deliver proper voltage to the Group C injectors. The PCM itself may have internal circuit damage.
- 4
Failed fuel injector
A defective fuel injector with internal resistance issues prevents proper voltage regulation in the Group C circuit. The injector coil may be partially open or shorted.
How to Diagnose It
- 1
Check Corroded or loose fuel injector connectors — Poor electrical connections at the fuel injector harness reduce voltage delivery to the injectors. Corrosion or loose pins prevent proper signal transmission from the PCM.
- 2
Check Damaged fuel injector wiring harness — A broken, shorted, or damaged wire in the fuel injector circuit reduces voltage supply. This can result from rodent damage, abrasion, or manufacturing defects.
- 3
Check Faulty fuel injector driver module or PCM — A defective injector driver circuit in the powertrain control module fails to deliver proper voltage to the Group C injectors. The PCM itself may have internal circuit damage.
- 4
Check Failed fuel injector — A defective fuel injector with internal resistance issues prevents proper voltage regulation in the Group C circuit. The injector coil may be partially open or shorted.
How to Fix It
- 1
Inspect and clean fuel injector connectors
Disconnect the fuel injector harness connectors for Group C injectors and inspect for corrosion, damage, or loose pins. Clean with electrical contact cleaner and reconnect firmly. Test voltage at the connector with a multimeter.
- 2
Check fuel injector wiring harness
Trace the entire fuel injector Group C circuit wiring from the PCM to each injector. Look for cuts, pinches, burned insulation, or rodent damage. Test continuity and voltage along the wire with a multimeter.
- 3
Test and replace fuel injectors
Perform fuel injector flow and resistance tests using diagnostic equipment. Replace any injector showing resistance outside manufacturer specifications or failing flow tests. Install new fuel injector(s) for the Group C circuit.
- 4
Reprogram or replace PCM
If wiring and injectors test normal, the injector driver module or PCM may be faulty. Have the PCM reprogrammed with the latest calibration or replaced if the driver circuit is damaged. This requires professional diagnostic equipment.
Need a deeper diagnosis?
Search for related repair guides or browse by system.