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's pins.
The cost of diagnosing the P1089 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
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.
Need more information on how to fix the P1089 GMC code? Get Access to Factory Service Manuals
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