P0741
DTC P0741 or P0742
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0741
- Torque Converter Clutch (TCC) System Stuck Off
DTC P0742
- Torque Converter Clutch (TCC) System Stuck On
Circuit/System Description
The torque converter clutch (TCC) pressure control solenoid is part of the control solenoid valve assembly which has no serviceable components. The TCC pressure control solenoid is a normally low pressure control solenoid. The TCC pressure control solenoid regulates transmission fluid pressure to the TCC regulator valve in the lower valve body and the TCC control valve in the fluid pump assembly. When vehicle operating conditions are appropriate to apply the torque converter clutch, the transmission control module (TCM) will increase TCC pressure control solenoid current flow thereby increasing pressure to move the TCC control valve into the apply position. When the TCC is fully applied, the engine is coupled directly to the transmission. TCC release is accomplished by the TCM decreasing current flow, dropping the apply pressure thereby allowing the TCC control valve to move to the release position. The TCM calculates torque converter slip speed based on the speed signal from the input shaft speed (ISS) sensor and engine RPM provided by the engine control module (ECM).
Conditions for Running the DTC
P0741
* DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, P0741, P0742, P2763, or P2764 is not set.
* Engine speed is 400-7,500 RPM or greater for 5 s.
* Ignition voltage is 9-32 V.
* Transmission fluid temperature is between -6.7 to +130°C (+20 to +266°F).
* Throttle position is 8% or greater.
* Engine torque is 50 Nm (36 lb ft) or greater.
* Engine torque signal is valid.
* Throttle position signal is valid.
* TCM detects the transmission gear ratios listed below for the commanded gear when TCC is commanded ON:
- 2nd gear ratio is between 2.75-3.17.
- 3rd gear ratio is between 1.78-2.04.
- 4th gear ratio is between 1.35-1.55.
- 5th gear ratio is between 0.93-1.07.
- 6th gear ratio is between 0.70-0.80.
* DTC runs continuously when the above conditions are met.
P0742
* DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, P0741, P0742, P2763, or P2764 is not set.
* Engine speed is 400-7,500 RPM for 5 s.
* Ignition voltage is 9-32 V.
* Transmission fluid temperature is between 15-130°C (59-266°F).
* Calculated throttle position was 10% or greater and has not dropped below 2%.
* Engine torque signal is valid.
* Throttle position signal is valid.
* Engine torque is 60 Nm (44 lb ft) or greater.
* Vehicle speed greater than 1 km/h (0.6 mph).
* TCC is commanded OFF.
* Engine torque signal is valid.
* Throttle position signal is valid.
* DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0741
* TCC pressure command is 500 kPa (73 PSI) or greater for 2 s.
* TCM detects TCC slip is 130 RPM or greater for 5 s.
* The above conditions must occur 2 times.
P0742
TCM detects the TCC slip is between -50 and +13 RPM for 1 s when TCC is commanded OFF. This condition must occur 8 times.
Action Taken When the DTC Sets
P0741
* P0741 is a Type B DTC.
* TCM inhibits 6th gear.
* TCM initiates Hot Mode shift pattern.
* TCM commands the TCC OFF.
P0742
* P0742 is a Type A DTC.
* TCM initiates Hot Mode shift pattern.
* TCM freezes transmission adaptive functions.
* TCM commands the TCC ON.
* TCM inhibits neutral idle.
Conditions for Clearing the DIC/DTC
* P0741 is a Type B DTC.
* P0742 is a Type A DTC.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views Outside Rearview Mirror - Driver
* Inline Harness Connector End Views X100
Description and Operation
* Transmission General Description Transmission General Description
* Transmission Component and System Description Transmission Component and System Description
* Electronic Component Description Electronic Component Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
DT-48616 - Solenoid Assembly Test Kit & Adapter Harness
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
1. Ignition ON, engine OFF.
2. Verify DTC P0716, P0717, P07BF, or P07C0 was not set by reviewing the scan tool TCM Failure Records.
• If any of the DTCs were set
Refer to DTC P0716, P0717, P07BF, or P07C0 P0716.
• If none of the DTCs were set
3. Engine idling, transmission in Park, with parking brake applied and drive wheels chocked.
4. Verify the transmission fluid level and condition is correct. Refer to Transmission Fluid Level and Condition Check Testing and Inspection.
• If the transmission fluid level and condition is not correct
Repair as necessary.
• If the transmission fluid level and condition is correct
5. Ignition ON, clear the TCM DTCs with a scan tool.
6. Verify DTC P0741 or P0742 does not set while performing a road test. Refer to Road Test Initial Inspection and Diagnostic Overview.
• If DTC P0741 or P0742 sets
Refer to Circuit/System Testing.
• If DTC P0741 or P0742 does not set
7. 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.
8. Verify the DTC does not set.
• If the DTC sets
Refer to Circuit/System Testing.
• If the DTC does not set
9. All OK.
Circuit/System Testing
1. Engine idling at the normal operating temperature.
2. Verify the transmission line pressures are within the specified range. Refer to Line Pressure Check Line Pressure Check and Solenoid Valve Pressure (Gen 1) Solenoid Valve Pressure (Gen 1)Solenoid Valve Pressure (Gen 2) Solenoid Valve Pressure (Gen 2).
• If the pressures are not within range
Refer to Fluid Pressure High or Low Fluid Pressure High or Low.
• If the pressures are within range
3. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
4. Verify the pressure changes for all solenoids when performing the solenoid test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test.
• If the pressure does not change
Replace the Q8 Control Solenoid Valve Assembly.
• If the pressure changes
5. Verify the mechanical conditions listed below do not exist. Repair or replace as necessary.
P0741 Upper Valve Body
Release exhaust port/orifice plugged or blocked.
P0741 or P0742 - Upper Valve Body
Torque converter clutch regulator valve stuck/sticking - debris, binding, damaged valve, or scored bore.
P0741 - Channel Plate and Spacer Plate
Oil channels or orifices blocked by debris.
P0741 or P0742 - Fluid Pump Assembly
Torque converter clutch control valve stuck/sticking - debris, binding, damaged valve, or scored bore.
P0741 - Torque Converter
* Torque converter clutch delamination or material worn off.
* Converter bolts too long damaging the clutch apply surface.
* Damaged seal.
P0741 - Support
Damaged seal.
P0741 or P0742 - A/Trans Case Cover (403)
* Pressure release blow-off not seating/sealing.
* Damaged spring.
P0741 - Turbine Shaft O-ring Seal
Cut or damaged.
P0741 or P0742 - Q8 Control Solenoid Valve Assembly
* Torque converter clutch pressure control solenoid stuck OFF or leaking.
* Torque converter clutch pressure control solenoid stuck ON.
* Control signal fluid supply leak due to valve body filter plate assembly cracked, or damaged gasket seal.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Perform the Transmission Adaptive Values Learn Transmission Adaptive Values Learn following all transmission repairs.
* Control Valve Body Assembly Removal Control Valve Body Assembly Removal
* Control Module References Control Module References for Control Solenoid Valve Assembly replacement, programming and setup.