2001 Chevrolet/Geo Camaro  

DTC P0742 5.7 L


Object Number: 42275 Size: MF
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Master Electrical Component ListAutomatic Transmission Controls SchematicsOBD II Symbol Description Notice
Circuit Description

The torque converter clutch (TCC) solenoid valve is a normally-open exhaust valve that is used with the torque converter clutch pulse width modulation (TCC PWM) solenoid valve in order to control fluid acting on the converter clutch apply valve. The TCC solenoid valve attaches to the transmission case assembly extending into the pump cover. When grounded (energized) by the powertrain control module (PCM), the TCC solenoid valve stops converter signal oil from exhausting. This causes converter signal oil pressure to increase and move the converter clutch apply valve against spring force and into the apply position. In this position, release fluid is open to an exhaust port and converter feed fluid fills the apply fluid circuit. The converter feed fluid applies the TCC. When the PCM no longer provides a ground path, the TCC solenoid valve de-energizes and apply fluid exhausts, releasing the TCC.

When the PCM detects low torque converter slip when the PCM commands the TCC OFF, then DTC P0742 sets. DTC P0742 is a type B DTC.

Conditions for Running the DTC
Conditions for Setting the DTC

DTC P0742 sets if the following condition occurs twice.

The TCC slip speed is -20 to +20 RPM for 5 seconds.

Action Taken When the DTC Sets
Conditions for Clearing the MIL/DTC
Diagnostic Aids

The TCC fluid hydraulically applies the TCC, possibly causing an engine stall, under the following conditions:

Test Description

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

  1. This step tests the hydraulic state of the TCC. When the PCM commands the TCC solenoid valve OFF, the slip speed should increase.

DTC P0742 (5.7 L)

Step

Action

Value(s)

Yes

No

1

Did you perform the Powertrain Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Engine Controls in Engine Controls - 5.7 L

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

    Important

    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.

  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. Drive the vehicle in the D4 drive range in second, third or fourth gear under steady acceleration, with a TP angle at 20%.

While the Scan Tool TCC Enable status is No, does the Scan Tool display a TCC Slip Speed within the specified range?

-20 to +20 RPM

Go to Step 3

Go to Diagnostic Aids

3

The TCC is hydraulically stuck ON. Inspect for the following conditions:

  • A clogged exhaust orifice in the TCC solenoid valve.
  • The converter clutch apply valve is stuck in the apply position.
  • A misaligned or damaged valve body gasket.
  • A restricted release passage.
  • A restricted transmission cooler line.

Did you find and correct the condition?

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Go to Step 4

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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:
    • Hold the throttle at 25 percent and accelerate to 88 km/h (55 mph).
    • Ensure that the Scan Tool TCC Slip Speed is 100 to 2000 RPM for 2 seconds, with the TCC OFF.
  4. Select Specific DTC.
  5. Enter DTC P0742.

Has the test run and passed?

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System OK

Go to Step 1