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For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 Optra 🢒 Transmission 🢒 Automatic Transmission - Aisin 81-40LE 🢒 DTC P0751

DTC P0751 Non European Emissions

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0751 1-2 Shift Solenoid (SS) Valve Performance - No First or Fourth Gear

Conditions for Setting the DTC
    • Shift solenoid 1 (SS1) is stuck ON/OFF
    • Drive (D) range is selected
    • Engine water is normal temperature
    • 20 seconds have passed since the transaxle was placed in Drive (D)
    • Engine revolution is 600 RPM or greater
    • No failure of output speed sensor, input speed sensor, engine revolution, water temperature signal, solenoid electrical, ranger sensor, throttle signal

Action Taken When the DTC Sets

The transmission control module (TCM) will request the illumination of the hold lamp and store the DTC when the TCM detects failures on 2 consecutive ignition cycles.

Conditions for Clearing the DTC
    • The TCM turns off the hold lamp when no further failures are detected on the next ignition cycles.
    • The scan tool can clear the DTC from the TCM history.
    • The TCM clears the DTC from the TCM history memory after 40 consecutive ignition cycles without fault.

Cause of Failure
    • SS1
    • Inside valve body
    • TCM

Step

Action

Yes

No

1
  1. Turn OFF the ignition.
  2. Install the scan tool.
  3. Turn ON the ignition, with the engine OFF.
  4. Select Store Freeze Frame/Failure Records from the Diagnostic Trouble Codes Information menu.
  5. Store Freeze Frame/Failure Records.
  6. Select Clear DTC Information from the Diagnostic Trouble Codes Information menu.
  7. Clear DTC Information.
  8. Perform 2 vehicle drive cycles.

Is the hold lamp ON?

Go to Step 2

Go to Step 5

2
  1. Select Request DTC by Status from the Diagnostic Trouble Codes Information menu.
  2. Request DTC by Status.

Is DTC P0751 displayed?

Go to Step 3

Go to Step 5

3
  1. Turn OFF the ignition.
  2. Replace the transmission control module (TCM). Refer to Transmission Control Module Replacement .
  3. Road test vehicle.

Is DTC P0751 displayed?

Go to Step 4

System OK

4
  1. Estimate the failure of shift solenoid 1 (SS1) or internal valve body.
  2. Inspect the SS1. Refer to 1, 2 Shift Solenoid, Timing Solenoid, and Lock-Up Solenoid Inspection .

Is the condition of the SS1 OK?

Go to Step 6

Go to Step 7

5

Repair the temporary connection failure of the connector. Refer to Wiring Harness and Connector Inspection Diagnosis .

System OK

--

6

Replace the valve body assembly. Refer to Control Valve Body Disassemble .

Did you complete the replacement?

System OK

--

7

Replace SS1.

Did you complete the repair?

System OK

Go to Step 6

DTC P0751 European Emissions

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0751 Shift Solenoid (SS) 1 Valve Performance - Stuck Off

Conditions for Setting the DTC
    • Shift solenoid 1 (SS1) is stuck ON/OFF
    • Drive (D) range is selected
    • Engine water is normal temperature
    • 20 seconds have passed since the transaxle was placed in Drive (D)
    • Engine revolution is 600 RPM or greater
    • No failure of output speed sensor, input speed sensor, engine revolution, water temperature signal, solenoid electrical, ranger sensor, throttle signal

Action Taken When the DTC Sets

The transmission control module (TCM) will request the illumination of the malfunction indicator lamp (MIL) and store the DTC when the TCM detects failures on 2 consecutive ignition cycles.

Conditions for Clearing the DTC
    • The TCM turns off the MIL when no further failures are detected on the next ignition cycles.
    • The scan tool can clear the DTC from the TCM history.
    • The TCM clears the DTC from the TCM history memory after 40 consecutive ignition cycles without fault.

Cause of Failure
    • SS1
    • Inside valve body
    • TCM

Step

Action

Yes

No

1
  1. Turn OFF the ignition.
  2. Install the scan tool.
  3. Turn ON the ignition, with the engine OFF.
  4. Select Store Freeze Frame/Failure Records from the Diagnostic Trouble Codes Information menu.
  5. Store Freeze Frame/Failure Records.
  6. Select Clear DTC Information from the Diagnostic Trouble Codes Information menu.
  7. Clear DTC Information.
  8. Perform 2 vehicle drive cycles.

Is the malfunction indicator lamp (MIL) ON?

Go to Step 2

Go to Step 5

2
  1. Select Request DTC by Status from the Diagnostic Trouble Codes Information menu.
  2. Request DTC by Status.

Is DTC P0751 displayed?

Go to Step 3

Go to Step 5

3
  1. Turn OFF the ignition.
  2. Replace the transmission control module (TCM). Refer to Transmission Control Module Replacement .
  3. Road test vehicle.

Is DTC P0751 displayed?

Go to Step 4

System OK

4
  1. Estimate the failure of shift solenoid 1 (SS1) or internal valve body.
  2. Inspect the SS1. Refer to 1, 2 Shift Solenoid, Timing Solenoid, and Lock-Up Solenoid Inspection .

Is the condition of the SS1 OK?

Go to Step 6

Go to Step 7

5

Repair the temporary connection failure of the connector. Refer to Wiring Harness and Connector Inspection Diagnosis .

Did you complete the repair?

System OK

--

6

Replace the valve body assembly. Refer to Control Valve Body Disassemble .

Did you complete the replacement?

System OK

--

7

Replace SS1.

Did you complete the repair?

System OK

Go to Step 6

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