DTC P0751 1-2 Shift Solenoid Valve Performance 5.7L

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Circuit Description

The 1-2 shift solenoid (SS) valve controls the fluid flow acting on the 1-2 and 3-4 shift valves. The 1-2 SS valve is a normally-open exhaust valve that is used with the 2-3 SS valve, in order to allow four different shifting combinations.

When the PCM detects a 1-1-4-4 or a 2-2-3-3 shift pattern, depending on the state of the mechanical failure, then DTC P0751 sets. DTC P0751 is a type A DTC.

Conditions for Running the DTC

Conditions for Setting the DTC

DTC P0751 sets if the following conditions occur three times:

All of the above conditions are met and one of the following conditions occurs:

Condition 1

Condition 2

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

Diagnostic Aids

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests that the PCM commanded all shifts, that all shift solenoid valves responded correctly, but that all the shifts did not occur.

DTC P0751 1-2 SS Valve Performance (5.7L)







Did you perform the Powertrain Diagnostic System Check?


Go to Step 2

Go to A Powertrain On Board Diagnostic (OBD) System Check in Engine Controls


  1. Install a Scan Tool .
  2. Turn ON the ignition, with the engine OFF.


Before clearing the DTC, use the Scan Tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the PCM.

  1. Record the DTC Freeze Frame and Failure Records.
  2. Clear the DTC.
  3. Drive the vehicle in D4 range under the following conditions: Accelerate the vehicle, ensuring that the PCM commands 1st, 2nd, 3rd and 4th gears.

Did you detect a 1-1-4-4 or 2-2-3-3 shift pattern?


Go to Step 3

Go to Diagnostic Aids


Check the shift solenoid/hydraulic circuit for the following conditions:

  • An internal malfunction.
  • Damaged seals on the shift solenoid valve. Refer to Shift Solenoid Leak Test .

Did you find and correct the condition?


Go to Step 4



Perform the following procedure in order to verify the repair:

  1. Select DTC.
  2. Select Clear Info.
  3. Drive the vehicle in D4 under the following conditions (only if traffic and road conditions permit):
    • Hold the throttle at 20% and accelerate to 88 km/h (55 mph).
    • If the throttle moves more than 5%, stop the vehicle and start over.
  4. Select Specific DTC.
  5. Enter DTC P0751.

Has the test run and passed?


System OK

Go to Step 1