Engine-Codes - GMC - P1089 GMC

P1089 GMC Code - Fuel Rail Pressure Performance During Deceleration Fuel Cut-Off

- Code Popularity: 12,373 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P1089 GMC?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Fuel Injector
  • Faulty Fuel Pressure Regulator
  • Fuel Pressure Regulator harness is open or shorted
  • Fuel Pressure Regulator circuit poor electrical connection
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How to Fix the DTC P1089 GMC?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P1089 GMC code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P1089 GMC Code Mean?

The Engine Control Module (ECM) monitors for changes in fuel rail pressure when the vehicle is in a deceleration condition and the fuel injected quantity is at zero. When scan tool parameter Deceleration Fuel Cut-Off is active, the fuel rail pressure should not deviate more than 2 MPa (290 PSI) from a calculated setpoint. If the fuel rail pressure deviates more than 2. MPa (290 PSI) from the calculated setpoint for approximately 10 seconds of cumulative deceleration (this may take multiple drive cycles), the Diagnostic Trouble Code (DTC) will set.

P1089 GMC Code - Fuel Rail Pressure Performance During Deceleration Fuel Cut-Off

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