GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2007 🢒 G3 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC P0977

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0977 Shift Solenoid 2 (SS2) Open or Short to Power

Conditions for Setting the DTC
    • No emergency mode.
    • TCM detects that the ON signal (12 V) of the shift solenoid monitor, when the SS2 driver outputs the OFF signal (0V) for 0.5 of a second continuously.
    • Detection continuously occurs 1 time.

Action Taken When the DTC Sets
    • The TCM will request the illumination of malfunction indicator lamp (MIL) and store the DTC when the TCM detects a failure on the first ignition cycle.
    • After failure detection the emergency mode is enabled.
    • No Lockup Control
    • No Engine Torque Reduction Control
    • No Engagement Pressure Control
    • No timing solenoid control for N - D
    • No 4th Gear
    • No Self-Learning Control

Conditions for Clearing the DTC
    • The TCM turns OFF the MIL when no further failures are detected on the next 3 consecutive 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.
    • The TCM detects the OFF signal of the SS2 monitor, when the SS2 driver outputs the OFF signal for 1000 milliseconds continuously.

Cause of Failure
    • The wiring harness or the connector between the SS2 and the TCM
    • The SS2
    • The TCM

Step

Action

Values

Yes

No

1

Did you perform the Diagnostic System Check - Automatic Transmission?

--

Go to Step 2

Go to Diagnostic System Check - Automatic Transmission

2
  1. Turn OFF the ignition.
  2. Install the scan tool.
  3. With the engine OFF, turn the ignition switch to the ON position.
  4. Select Store Freeze Frame/Failure Records from the DTC Information menu.
  5. Store Freeze Frame/Failure Records.
  6. Select Clear DTC Information from the DTC Information menu.
  7. Clear the DTC information.
  8. Perform 1 vehicle drive cycle.

Is the malfunction indicator lamp (MIL) ON?

--

Go to Step 3

Go to Step 5

3
  1. Select Request DTC by Status from the DTC Information menu.
  2. Request DTC by Status.

Is DTC P0977 displayed?

--

Go to Step 4

Go to Step 5

4
  1. Turn OFF the ignition.
  2. Measure the resistance between the vehicle harness and SS2.
  3. Disconnect the transmission control module (TCM) connector (X-1) and measure the resistance between terminal A15 and A23.

Is the measurement within the specified values?

20°C (68°F)

11-16Ω

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
  1. Inspect for damage between the vehicle wiring harness connector and the TCM.
  2. Inspect the connector. Refer to Wiring Harness and Connector Inspection Diagnosis .
  3. Inspect the connection condition between the connectors.

Is the connection condition OK?

--

Go to Step 8

Go to Step 5

7
  1. Inspect for damage between the vehicle harness and the SS2.
  2. Disconnect the transaxle harness connector (X-3) of the T/M wiring harness and inspect the resistance between the SS2 connector terminal 10 and Ground.

Is the measurement within the specified values?

20°C (68°F)

11-16 Ω

Go to Step 9

Go to Step 10

8
  1. Replace the TCM. Refer to Transmission Control Module Replacement .
  2. Perform the reproducing test under user condition after confirming no DTC.

Is a DTC displayed?

--

Go to Step 2

System OK

9
  1. Inspect for damage of the vehicle wiring harness or between the connectors.
  2. Test for continuity and/or a short circuit for the vehicle wiring harness and inspect the connection condition between the transaxle harness connectors. Refer to Wiring Harness and Connector Inspection Diagnosis .

Is the condition OK?

--

System OK

Go to Step 5

10
  1. Inspect for damage of the transmission harness connector wire or between the connector and the solenoid.
  2. Inspect the solenoid for damage.

Is the condition found?

--

Go to Step 12

Go to Step 11

11
  1. Inspect for damage of the transmission harness connector.
  2. Test the continuity and short circuit for the transmission harness connector and inspect the connection condition between connectors. Refer to Wiring Harness and Connector Inspection Diagnosis .

Is the condition OK?

--

System OK

Go to Step 5

12

Replace the solenoid.

Did you complete the replacement?

--

System OK

--