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P0974 GMC Code - Shift Solenoid Valve 1 Control Circuit High Voltage

- Code Popularity: 1,453 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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By AutoCodes.com - Updated Aug 05, 2022
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|Code P0974 GMC Possible Causes

  • Low transmission fluid level
  • Dirty transmission fluid
  • Faulty Transmission Control Solenoid Valve
  • Transmission Control Solenoid Valve harness is open or shorted
  • Transmission Control Solenoid Valve circuit poor electrical connection

|How do I Fix the Code P0974 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's pins.

Does your GMC have Safety Recalls? → Check here

|What is the Cost to Diagnose the Code P0974 GMC?

Labor: 1.0

The cost of diagnosing the P0974 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.

|What are Code P0974 GMC Possible Symptoms?

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

|Code P0974 GMC Description

The shift solenoid 1 is part of the control solenoid valve assembly which has no serviceable parts. The shift solenoid 1 is a normally closed ON/OFF solenoid and is controlled by the Transmission Control Module through a low side driver. When the shift solenoid 1 is energized, shift solenoid 1 fluid pressure is directed to the clutch select valve 2. Power to the shift solenoid 1 is supplied by the Transmission Control Module through a high-side driver. The high-side driver protects the circuit and components from excessive current flow. If excessive current flow is detected, the high side driver will turn OFF. When the fault is corrected, the high-side driver will reset. The Diagnostic Trouble Code (DTC) will be set when the control solenoid valve assembly detects an internal high voltage electrical malfunction of the shift solenoid 1 control circuit when the shift solenoid 1 is commanded ON for 2 seconds.

OBDII Code P0974 GMC - Shift Solenoid Valve 1 Control Circuit High Voltage - AutoCodes.com
P0974 GMC Code - Shift Solenoid Valve 1 Control Circuit High Voltage

|Need More Information on the P0974 GMC Code?

Need more information on how to fix the P0974 GMC code? Get Access to Factory Service Manuals

|Need Help with the P0974 GMC Code?

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|Code P0974 GMC comments

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