P1481 GMC - Cooling Fan Speed Signal Lost

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

P1481 GMC Possible Causes

  • Faulty Fan Clutch Assembly
  • Fan Clutch Assembly harness is open or shorted
  • Fan Clutch Assembly circuit poor electrical connection

First diagnose P1481 GMC code

    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 terminals.

Cost of diagnosing the P1481 GMC code

    Labor: 1.0

    The cost of diagnosing the P1481 GMC code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

When is the P1481 GMC code detected?

The Engine Control Module (ECM) has detected a loss of the cooling fan speed signal

P1481 GMC Possible Symptoms

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

P1481 GMC Meaning

The engine cooling fan is a variable speed fan. The Engine Control Module (ECM) controls the fan speed by sending a pulse width modulated signal to the cooling fan speed control module. The cooling fan control module varies the voltage drop across the engine cooling fan motor in relation to the pulse width modulated signal. The cooling fan speed is affected by many different conditions and can be adjusted from 10-90 percent duty cycle. Ninety percent is considered high fan speed. When multiple cooling speed requests are received, the ECM uses the highest cooling fan speed of all the requests. During normal fan ON operation, the control circuit voltage will be low and near battery voltage when the fan is OFF.
OBDII Code P1481 GMC - Cooling Fan Speed Signal Lost - Engine-Codes.com

P1481 GMC More Information

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