P0289 - Cylinder 10 Injector Circuit High
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System
Powertrain (Engine & Gearbox)
Related Fault Codes
Technical Description
P0289 is a diagnostic trouble code (DTC) that indicates the Engine Control Module (ECM) has detected a high voltage condition within the fuel injector control circuit for cylinder number 10. This typically signifies that the circuit is shorted to voltage or that the injector solenoid has failed internally. The ECM monitors the duty cycle and the feedback voltage of the injector driver; if the voltage remains above a calibrated threshold when the driver is commanded off (or during the firing pulse), the code is stored. This fault often triggers a fail-safe mode to prevent engine damage or catalyst overheating.
Possible Causes
Short to voltage in the fuel injector wiring harness for cylinder 10
Faulty fuel injector (internal solenoid short)
Corroded or damaged pins in the injector connector
Internal Engine Control Unit (ECU/PCM) driver failure
Symptoms
Recommended Solution
- Visual Inspection: Check the wiring harness and connector for cylinder 10 for signs of chafing, melted insulation, or corrosion.
- Resistance Test: Disconnect the injector and measure the resistance across the solenoid terminals (Standard is often 12-16 Ohms). A reading near 0 Ohms indicates an internal short.
- Circuit Voltage Test: With the ignition on and engine off, check the control wire for unexpected battery voltage when disconnected to identify a short to power.
- Advanced Diagnosis: Use an oscilloscope or Noid light to verify the pulse width and signal from the ECU.
- Component Replacement: Replace the fuel injector or repair the wiring harness as necessary.
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
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