GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Malibu 🢒 Engine 🢒 Engine Controls - 3.1L 🢒 DTC P0741 TCC System Stuck Off

DTC P0741 TCC System Stuck Off 2.4L and 3.1L


Object Number: 204476 Size: MF
Automatic Transmission Components
Automatic Transmission Controls Schematics
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The torque converter clutch (TCC) solenoid valve is a pulse width modulation (PWM) solenoid. When vehicle operating conditions are appropriate for TCC application, the PCM begins the TCC duty cycle at approximately 42%. The PCM then increases the duty cycle up to 90%, in order to achieve full TCC apply pressure.

When the TCC PWM solenoid valve is de-energized, the solenoid blocks filtered 2-3 drive fluid, and allows TCC signal fluid to exhaust. When energized, the solenoid modulates fluid into the TCC signal fluid circuit. When fully energized, modulation stops, and the solenoid blocks both 2-3 drive fluid and TCC signal fluid exhaust.

When the PCM detects a high TCC slip speed when the TCC is commanded ON, then DTC P0741 sets. DTC P0741 is a type B DTC.

Conditions for Running the DTC
    • No TP DTCs P0121, P0122 or P0123.
    • No VSS DTCs P0502 or P0503.
    • No TCC stuck ON DTC P0742.
    • No TFP manual valve position switch DTC P1810.
    • No TCC release DTC P1887.
    • The time since the gear select lever change is greater than 6 seconds.
    • The TFP manual valve position switch indicates 2, 3, or D.
    • The PCM commands the TCC ON for greater than 3 seconds.
    • The TP is 8-75%.
    • The transmission fluid temperature (TFT) is 21-130°C (70-266°F).
    • The commanded gear is 2nd, 3rd, or 4th.

Conditions for Setting the DTC

The TCC slip speed is greater than 250 RPM for 8 seconds, twice during the same trip.

Action Taken When the DTC Sets
    • The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
    • The PCM inhibits TCC engagement.
    • The PCM freezes shift adapts from being updated.
    • The PCM stores DTC P0741 in PCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.

Conditions for Clearing the MIL/DTC
    • The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.
    • A scan tool clears the DTC from PCM history.
    • The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
    • The PCM cancels the DTC default actions when the fault no longer exists and the ignition switch is OFF long enough in order to power down the PCM.

Diagnostic Aids
    • Inspect the transmission fluid level.
    • The transmission may be in hot mode. Inspect the transmission fluid lines to the radiator. The lines may be pinched, plugged or twisted.
    • If the PCM is unable to ground the TCC control circuit this DTC may set.

Test Description

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

  1. This step inspects the transmission fluid to ensure that it is at the proper level.

    2.

  2. This step verifies that the TCC engages when commanded ON by the scan tool.

DTC P0741 TCC System -- Stuck Off (2.4L and 3.1L)

Step

Action

Value(s)

Yes

No

1

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check (2.4L) or Powertrain On Board Diagnostic (OBD) System Check (3.1L)

2

Was the Transmission Fluid Checking Procedure performed?

--

Go to Step 3

Go to Transmission Fluid Check

3

  1. Install the Scan Tool .
  2. Turn the ignition switch to the RUN position.

    3. Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the stored Freeze Frame and Failure Records from the PCM.

  3. Record the Freeze Frame and Failure Records.
  4. Clear the DTCs.
  5. Drive the vehicle at 72 km/h (45 mph).
  6. Using the scan tool, command the TCC PWM solenoid valve ON.
  7. Monitor the TCC slip speed.

Is the slip speed less than the specified value?

50 RPM

Go to Diagnostic Aids

Go to Step 4

4
  1. Inspect for the following conditions:
    2. • The TCC PWM solenoid valve O-ring for leaks or cuts.
    • The TCC PWM solenoid valve for the filter being clogged.
    • The TCC control valve for being stuck in the TCC release position.
    • The TCC regulated apply valve for being stuck in the TCC release position.
    • The TCC feed limit valve for being stuck due to sediment or binding.
    • The pressure regulator valve for being stuck due to sediment or binding.
    • The TCC fluid circuits for leaks.
    • The turbine shaft seals for leaks or cuts.
    • The TCC control circuit for proper operation by the PCM.
  2. Repair any of the above items as necessary.

Is the repair complete?

--

Go to Step 5

Go to Diagnostic Aids

5

Perform the following procedure in order to verify the repair:

  1. Select DTC.
  2. Select Clear Info.
  3. Operate the vehicle under the following conditions:
    4. • Drive the vehicle in D4 with the TP greater than 8%.
    • Obtain 72 km/h (45 mph).
    • With the TCC commanded ON and engaged, the slip speed must be less than 50 RPM for 4 seconds.
  4. Select Specific DTC.
  5. Enter DTC P0741.

Has the test run and passed?

--

System OK

Go to Step 1