Cylinder 10 Injector Circuit High
P0289 indicates the fuel injector circuit for cylinder 10 is reading a higher-than-expected voltage or resistance signal. This means the engine control module detected an electrical fault in the injector circuit, preventing proper fuel delivery to that cylinder. The fault can cause rough idle, poor acceleration, and increased emissions.
What You Might Notice
- Malfunction indicator light (check engine light) illuminates
- Engine runs rough or hesitates at idle
- Reduced fuel economy and poor acceleration
- Lack of power during acceleration
- Possible misfiring in cylinder 10
Most Common Causes
- 1
Faulty fuel injector
The injector for cylinder 10 may have high internal resistance or an open circuit, causing the PCM to detect a high voltage condition in the injector circuit.
- 2
Damaged injector wiring harness
Corroded, broken, or pinched wiring between the PCM and the cylinder 10 fuel injector can cause high resistance and voltage reading errors.
- 3
Faulty injector driver circuit in PCM
The engine control module's injector driver circuit for cylinder 10 may be malfunctioning, preventing proper circuit voltage regulation.
- 4
Poor electrical connections or corroded connectors
Loose, corroded, or improperly seated connectors at the fuel injector or PCM can create high resistance and trigger the code.
How to Diagnose It
- 1
Check Faulty fuel injector — The injector for cylinder 10 may have high internal resistance or an open circuit, causing the PCM to detect a high voltage condition in the injector circuit.
- 2
Check Damaged injector wiring harness — Corroded, broken, or pinched wiring between the PCM and the cylinder 10 fuel injector can cause high resistance and voltage reading errors.
- 3
Check Faulty injector driver circuit in PCM — The engine control module's injector driver circuit for cylinder 10 may be malfunctioning, preventing proper circuit voltage regulation.
- 4
Check Poor electrical connections or corroded connectors — Loose, corroded, or improperly seated connectors at the fuel injector or PCM can create high resistance and trigger the code.
How to Fix It
- 1
Inspect and clean fuel injector connectors
Check the connector at cylinder 10's fuel injector for corrosion, loose pins, or debris. Clean with electrical contact cleaner and reseat firmly. Verify proper connection.
- 2
Test and replace fuel injector for cylinder 10
Use a multimeter to test the injector's resistance and continuity. If the injector is faulty (open circuit or high resistance), replace it with a new or quality remanufactured unit.
- 3
Inspect and repair injector circuit wiring
Examine the wiring harness from the PCM to the cylinder 10 fuel injector for visible damage, pinches, or corrosion. Repair or replace damaged sections of the harness as needed.
- 4
Consult TSBs and test PCM injector driver circuit
Check manufacturer technical service bulletins for known issues with cylinder 10 injector circuits. If wiring and injector test good, the PCM driver circuit may require professional diagnostic testing or PCM replacement.
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