DTC P0751 or P0752
Diagnostic InstructionsDTC Descriptor
DTC P0751

Shift Solenoid Valve 1 Performance - Stuck Off

DTC P0752

Shift Solenoid Valve 1 Performance - Stuck On

Diagnostic Fault Information

Note: The components are listed from the least to the most intrusive to service.

Component

DTC

Condition

Q8 Control Solenoid Valve Assembly

P0751orP0752

  • Q32A Shift Solenoid Valve 1—Binding or Sticking/Stuck
  • Control Solenoid Valve Assembly Filter Plate—Blocked by debris/RestrictedorCracked
  • O-Ring—Leaking

Control Valve Body

P0751

  • Clutch Selector Valve Bore Plug—Incorrect—Small
  • Check ball #1 missing or damaged.

P0751orP0752

  • 1-R and 4-5-6 Clutch Regulator Valve—Binding or Sticking/Stuck
  • Clutch Selector Valve—Binding or Sticking/Stuck

Control Valve Channel Plate

P0751orP0752

Oil Channels or Orifices—Blocked by debris/Restricted

Control Valve Channel Plate Spacer Plate

P0751orP0752

Oil Channels or Orifices—Blocked by debris/Restricted

Output Carrier Assembly

P052

Pinion Pins—Incorrect installation

Circuit/System Description

The solenoid valve directs fluid pressure to the clutch select valve, which controls the position of the valve.

DTC P0751, P0752 will set with a hydraulic/mechanical condition.

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

Conditions for Running the DTC
  • DTC P0101–P0103, P0106–P0108, P0171, P0172, P0174, P0175, P0201–P0208, P0300–P0308, P0401, P042E, P0716, P0717, P0722, P0723, P182E = Not set
  • Accelerator Pedal Position=Greater than 0.5%
  • Accelerator pedal position signal = Valid
  • { P0751 }Commanded gear=1st Gear
  • { P0752 }Commanded gear=3rd Gear
  • Engine Speed=400 to 7,500 RPM
  • Engine Torque Signal=Valid
  • High Side Driver=Enabled
  • Ignition Voltage=9 to 32 V
  • Transmission=Not Shifting
  • Transmission Fluid Temperature=Warmer than −6.6°C (20.1°F)
  • Transmission Output Speed=Greater than 100 RPM

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

Conditions for Setting the DTCP0751
  • Gear ratio 1.51 to 1.37 detected.
  • Transmission slip=Greater than 400 RPM—For greater than 1 s

The above condition(s) must occur 8 times.

P0752
  • Transmission slip=Greater than 400 RPM—For greater than 2.5 s
  • Gear Command=4th Gear
  • Gear ratio 4.35 to 4.81 detected.—For greater than 15 s

The above conditions must occur in sequence 5 times

Actions Taken When the DTC SetsP0751

DTC P0751=Type B DTC—Additional actions taken:

  • 1st Gear=Inhibited
  • { If equipped }Neutral Idle Mode=Disabled
P0752

DTC P0752=Type A DTCAdditional 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=2nd GearorNeutral
Conditions for Clearing the DTC

DTC P0751=Type B DTC

DTC P0752=Type A DTC

Reference Information

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References

Circuit/System Verification
  1. Verify the condition does not exist:Incorrect fluid level or condition»Refer to:Transmission Fluid Level and Condition Check
    • If a condition exists

      Repair or replace as necessary

    • If no condition exists
  2. Ignition » On / Vehicle » In Service Mode
  3. Clear the DTCs.
  4. Road test the vehicle.»Refer to:Road Test

    Verify DTC P0716, P0717, P0722, P0723 is not set

    • If none of the DTCs are set
  5. Verify DTC P0751, P0752 is not set
    • If DTC P0751 or P0752 is set

      Refer to:Circuit/System Testing

    • If none of the DTCs are set
  6. 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:Circuit/System Testing

    • If the DTC is not set
  7. All OK.
Circuit/System Testing
  1. Verify the condition does not exist:Incorrect pressure»Refer to:Line Pressure Check&Solenoid Valve Pressure
    • If no condition exists
  2. Ignition/Vehicle » Off
  3. Remove the component:Q8 Control Solenoid Valve Assembly
  4. Verify the procedure/test passes.»Refer to:Control Solenoid Valve and Transmission Control Module Assembly Inspection
    • If the procedure/test does not pass

      Replace the component:Q8 Control Solenoid Valve Assembly

    • If the procedure/test passes
  5. Refer to:Diagnostic Fault Information
Repair Instructions

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