• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here:Diagnostic Procedure Instructions

For an overview of the component/system, refer to:Electronic Component Description

No external circuit diagnosis is involved.

• Engine Speed=400 to 7,500 RPM
• Ignition Voltage=9 to 32 V

Frequency the DTC runs=Continuously—After the running conditions are met—For greater than 5 s

Control Circuit=Short to Ground—For greater than 12 s—Within 15 s

Control Circuit=Open CircuitorShort to Voltage—For greater than 12 s—Within 15 s

DTC P0973=Type A DTC—Additional actions taken:

• Grade braking=Disabled
• Line Pressure Command=Maximum
• Manual Shift Control=Disabled
• { If equipped }Mode Switch=Disabled
• { If equipped }Neutral Idle Mode=Disabled
• Powertrain braking=Disabled
• Transmission Adaptive Pressure Control=Freeze current adapt values
• Transmission gear allowed=Neutralor2nd Gear

P0974=Type B DTC—Additional actions taken:

• 1st Gear=Disabled
• { If equipped }Neutral Idle Mode=Disabled

DTCs listed in the DTC Descriptor category=Type A DTC—Exceptions listed below

DTC P0974=Type B DTC

Automatic Transmission Controls Schematics

Master Electrical Component List

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Control Module References

DT-48616-10 - Adapter Harness

Equivalent regional tools:Special Tools

1. Ignition » On / Vehicle » In Service Mode
2. Perform the scan tool control function:Shift Solenoid Valve 1»On and Off

   Verify the scan tool parameter:

• Shift Solenoid Valve 1 Control Circuit High Voltage Test Status=OKorNot Run
• Shift Solenoid Valve 1 Control Circuit Low Voltage Test Status=OKorNot Run
• Shift Solenoid Valve 1 Control Circuit Open Test Status=OKorNot Run
• If not the specified state

  Refer to:Component Testing

• If the specified state
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

   Verify the DTC does not set.

• If the DTC sets

  Refer to:Component Testing

• If the DTC is not set
4. All OK.

1. Ignition/Vehicle » Off
2. Remove the component:Q8 Control Solenoid Valve Assembly
3. Verify a condition does not exist with the component:Contamination with metallic debris
• If a condition exists

  Repair or replace as necessary

• If no condition exists
4. Verify the resistance is within the specified range for each solenoid valve.»Refer to:Control Solenoid Valve and Transmission Control Module Assembly Inspection
• If the resistance is not within range

  Replace the component:Q8 Control Solenoid Valve Assembly

• If the resistance is within range
5. Install»DT-48616-10 - Adapter Harness@Q8 Control Solenoid Valve Assembly&Vehicle wiring harness X1
6. Connect the electrical connector:B15 Transmission Internal Mode Switch
7. Ignition » On / Vehicle » In Service Mode
8. Perform the scan tool control function:Pressure Control Solenoid Valve 2»On and Off

   Verify the scan tool parameter:

• Shift Solenoid Valve 1 Control Circuit High Voltage Test Status=OKorNot Run
• Shift Solenoid Valve 1 Control Circuit Low Voltage Test Status=OKorNot Run
• Shift Solenoid Valve 1 Control Circuit Open Test Status=OKorNot Run
• If not the specified state

  Replace the component:Q8 Control Solenoid Valve Assembly

• If the specified state
9. All OK.

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

• Control Solenoid Valve and Transmission Control Module Assembly Replacement—Q8 Control Solenoid Valve Assembly
• For control module replacement, programming, and setup refer to:Control Module References

Transmission Adaptive Values Learn—Perform after any repair