Buick Regal: DTC P0741 or P0742
Diagnostic Instructions
- Perform the Diagnostic System Check prior to using this diagnostic
procedure: Refer to Diagnostic System
Check - Vehicle
- Review the description of Strategy Based Diagnosis:Strategy Based
Diagnosis
- An overview of each diagnostic category can be found here: Refer to
Diagnostic Procedure Instructions
DTC Descriptor
DTC P0741
Torque Converter Clutch (TCC) Pressure Control Solenoid Valve Stuck Off
DTC P0742
Torque Converter Clutch (TCC) System Stuck On
Circuit/System Description
The following inputs are used to determine TCC slip speed:
- Crankshaft Position Sensor
- Transmission ISS
When the amount of TCC slip is greater than desired, DTC P0741 sets.When the
amount of TCC slip is less than
desired, DTC P0742 sets.
Conditions for Running the DTC
- DTC P0711, P0712, P0713 P0717, P07BF, P07C0, P0722, P077C, P077D, P2761,
P2763, P2764 = Not set
- { P0742 }Engine Speed=1000 to 3000 RPM & Engine Torque=Greater than 60
Nm (44 lb ft)
- { P0741 }Engine Speed=Less than 4001 RPM & Engine Torque=Greater than 0
Nm (0 lb ft)
- Ignition=9 to 32 V
- Transmission Range=Drive
- Transmission Fluid Temperature=Greater than 19ºC (66ºF)
Frequency the DTC runs=Continuously - After the running conditions are met -
For 2 s
Conditions for Setting the DTC
P0741
Torque Converter Clutch=Applied & TCC Slip Speed=Greater than 100 RPM - For
greater than 18 s
P0742
Torque Converter Clutch=Released & TCC Slip Speed=Less than 30 RPM - For
greater than 24 s
Actions Taken When the DTC Sets
DTC P0741=Type B DTC
DTC P0742=Type C DTC
- { P0742 }Autostart/Autostop=Disabled - If equipped
- Learning=Disabled
- Torque Converter Clutch=Disabled
Conditions for Clearing the DTC
DTC P0741=Type B DTC
DTC P0742=Type C DTC
Reference Information
Schematic: Reference
Refer to Automatic Transmission Controls Wiring Schematics.
Connector End View: Reference
Refer to Component Connector End View Index.
Component View: Reference
Refer to Disassembled Views.
Description and Operation
Refer to Transmission General Description.
Electrical Information: Reference
- Refer to Circuit Testing
- Refer to Connector Repairs
- Refer to Testing for Intermittent Conditions and Poor Connections
- Refer to Wiring Repairs
DTC Type: Reference
Refer to Powertrain Diagnostic Trouble Code (DTC) Type Definitions.
Scan Tool: Reference
Refer to Control Module: References.
Circuit/System Verification
1. Ignition - On / Vehicle - In Service Mode
2. Verify there are no DTCs set related to the following
system/component:Q39A Torque Converter Clutch
Pressure Control Solenoid Valve
Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If no other DTCs are set
3. Verify the condition does not exist:Incorrect fluid level or condition -
Transmission - Refer to Transmission
Fluid Level and Condition Check
Repair or replace as necessary.
- Go to next step: If no condition exists
4. Clear the DTCs.
5. Perform the configuration/reset function: Refer to Learned Values Reset.
6. Road test the vehicle. - Refer to Road Test.
7. Verify DTC P0741, P0742 is not set.
- {Test failed 1 time (s) }If any of the DTCs are set
- Replace the component:K71 Transmission Control Module
- Refer to:Step 5
- {Test failed 2 time (s) }If any of the DTCs are set
- Replace the component: Control Valve Body
- Refer to:Step 5
- {Test failed 3 time (s) }If any of the DTCs are set
- Replace the component: T12 Automatic Transmission Assembly
- Refer to:Step 5
- Go to next step: If none of the DTCs are set
8. Operate the vehicle within the Conditions for Running the DTC. You may
also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Verify the DTC does not set.
Refer to:Step 1
- Go to next step: If the DTC is not set
9. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair: Refer
to Diagnostic Repair Verification
- Refer to Control Valve Body Replacement
- Refer to Torque Converter Replacement
- Refer to Transmission Replacement
- For control module replacement, programming, and setup: Refer to Control
Module: References
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure: Refer to Diagnostic System
Check - Vehicle
Review the description of Strategy Based Diagnosi
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure: Refer to Diagnostic System
Check - Vehicle
Review the description of Strategy Based Diagnosi
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure: Refer to Diagnostic System
Check - Vehicle
Review the description of Strategy Based Diagnosi
SEE MORE:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptors
D
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