Fuel Injector Group "D" Supply Voltage Circuit/Open
P2155 indicates a circuit malfunction in Fuel Injector Group D, affecting the electronic control system that delivers fuel to a specific cylinder bank or group. This code sets when the engine control module detects an open circuit, short circuit, or voltage supply problem in the injector group's wiring or control circuit, preventing proper fuel delivery to those cylinders.
What You Might Notice
- Check engine light illuminated
- Rough idle or unstable engine operation
- Reduced fuel economy
- Loss of power or reduced acceleration
- Possible misfires in affected cylinders
Most Common Causes
- 1
Damaged fuel injector wiring or connector
Corroded, frayed, or disconnected wires in the injector group D circuit prevent proper voltage supply. Check for loose connectors at the fuel injectors or in the engine harness.
- 2
Faulty fuel injector
A failed injector in group D may have an open internal coil or damaged solenoid. This prevents the injector from receiving or responding to electrical signals.
- 3
Engine control module (ECM) driver circuit failure
The ECM's internal driver circuit that controls group D injectors may be damaged, unable to supply proper voltage or ground to the injector circuit.
- 4
Battery or power supply voltage issue
Low battery voltage or alternator problems may prevent sufficient voltage from reaching the fuel injector group, causing the circuit to be detected as open.
How to Diagnose It
- 1
Check Damaged fuel injector wiring or connector — Corroded, frayed, or disconnected wires in the injector group D circuit prevent proper voltage supply. Check for loose connectors at the fuel injectors or in the engine harness.
- 2
Check Faulty fuel injector — A failed injector in group D may have an open internal coil or damaged solenoid. This prevents the injector from receiving or responding to electrical signals.
- 3
Check Engine control module (ECM) driver circuit failure — The ECM's internal driver circuit that controls group D injectors may be damaged, unable to supply proper voltage or ground to the injector circuit.
- 4
Check Battery or power supply voltage issue — Low battery voltage or alternator problems may prevent sufficient voltage from reaching the fuel injector group, causing the circuit to be detected as open.
How to Fix It
- 1
Inspect and repair fuel injector connectors
Locate the fuel injectors in group D (consult your vehicle's service manual for specific cylinder identification), check for corrosion, loose connections, or damaged pins. Clean contacts with electrical contact cleaner and reseat connectors firmly.
- 2
Test and replace faulty fuel injector
Use a fuel injector testing tool or multimeter to verify injector resistance and operation. If the injector is open-circuit or not responding to commands, replace the defective fuel injector with an OEM or quality equivalent part.
- 3
Check engine harness and wiring
Inspect the entire fuel injector harness from the ECM to the injectors for cuts, pinches, or loose connections. Repair any damaged wiring by splicing with appropriate connectors or replacing the entire harness section if necessary.
- 4
Test battery and alternator voltage
Verify battery voltage is above 12V at rest and alternator is charging properly (13.5-14.5V at idle). If voltage is low, charge the battery or test the alternator for failure. Inadequate voltage prevents fuel injector circuits from operating correctly.
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