P0289 medium Severity

P0289: Cylinder 10 Injector Circuit High

May cause rough idle, misfire, loss of power and increased fuel consumption; driving with unresolved fault can increase risk of additional engine performance issues

Overview

P0289 indicates the fuel injector circuit for cylinder 10 has a high voltage/current condition detected by the PCM, often due to electrical wiring, connector or injector faults requiring systematic electrical diagnosis

Common Symptoms

  • Check Engine Light illuminated
  • Rough idle or engine vibration
  • Loss of power or poor acceleration
  • Reduced fuel economy
  • Misfire on cylinder 10

Most Common Causes

Faulty electrical wiring or harness for injector 10 high

Corroded, damaged or loose wiring/harness can increase resistance causing high circuit reading

Faulty cylinder 10 fuel injector (internal short/high current draw) high

Injector internal coil or solenoid issues can cause abnormal electrical draw

Poor electrical connector contact at injector 10 medium

Oxidized or loose connector pins raise resistance and trigger the code

PCM / engine control module injector driver fault medium

Rare but possible internal driver circuit failure leading to high voltage reading

Diagnostic Steps

  1. Verify code with a professional-level OBD-II scanner
    Expected: P0289 stored, check for related misfire or fuel system codes
    Interpretation: Confirms current or pending fault and context with other DTCs
  2. Visual inspection of injector 10 wiring and connector
    Expected: No frayed wires, corrosion, loose/bent pins
    Interpretation: Damaged or poor connection indicates likely electrical issue
  3. Measure injector resistance with multimeter
    Expected: Resistance within OEM specs (often ~0.5 to 2.0 ohms)
    Interpretation: Out-of-spec means injector internal short or open
  4. Swap injector 10 with another identical injector
    Expected: Fault code follows the injector if injector is faulty
    Interpretation: Helps isolate injector versus wiring/PCM issue
  5. Backprobe circuit while engine runs and check voltage/current waveform
    Expected: Voltage within expected range; no spikes above threshold
    Interpretation: Abnormal waveform suggests driver circuit or wiring fault

Repair Solutions

Repair or replace damaged injector 10 wiring/connector medium
Estimated Cost: $50 - $300

Connector and wiring harness repairs are common and often resolve circuit high

Replace faulty cylinder 10 fuel injector medium
Estimated Cost: $150 - $500

Injector replacement required if internal short/high draw confirmed

Repair or replace PCM injector driver circuitry hard
Estimated Cost: $800 - $1500

Only if confirmed by thorough PCM diagnostics; often dealer-level service

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Assuming mechanical fuel delivery failure (e.g., clogged injector) without electrical testing

Frequently Asked Questions

Technical definition of P0289 OBD-II Code

When your OBD-II scanner reads P0289, it means: Cylinder 10 Injector Circuit High. This code is related to the vehicle's Fuel System.

How serious is the P0289 code?

The P0289 code is considered medium severity. May cause rough idle, misfire, loss of power and increased fuel consumption; driving with unresolved fault can increase risk of additional engine performance issues

What happens when the P0289 code is active?

Common symptoms include: Check Engine Light illuminated, Rough idle or engine vibration, Loss of power or poor acceleration. You might also notice the Check Engine Light is on.

What parts fail when P0289 is set?

It can be caused by several factors, most notably: Faulty electrical wiring or harness for injector 10, Faulty cylinder 10 fuel injector (internal short/high current draw), Poor electrical connector contact at injector 10.

Is P0289 expensive to fix?

The cost varies significantly based on the root cause. For example, replacing a Repair or replace damaged injector 10 wiring/connector typically costs between $50 and $300, while fixing a Repair or replace PCM injector driver circuitry can range from $800 to $1500.

Does P0289 affect Ford, Toyota, or Honda?

Yes, P0289 is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

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