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 RPM or greater for 5 seconds.
* Ignition voltage is 9.0 volts or greater.
* Transmission fluid temperature is between -7 to +137°C (19-279°F).
* Throttle position is 8 percent or greater.
* Engine torque is 50 Nm (36 lb ft) or greater.
* 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.
* TCC is commanded ON.
* Engine torque signal is valid.
* Throttle position signal is valid.
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 greater than 400 RPM for 5 seconds.
* Ignition voltage is 9.0 volts or greater.
* Transmission fluid temperature is between 15-137°C (59-279°F).
* Calculated throttle position was 10 percent or greater and has not dropped below 2 percent.
* Engine torque is greater than 60 Nm (44 lb ft).
* Vehicle speed greater than 1 km/h (0.6 mph).
* TCC is commanded OFF.
Conditions for Setting the DTC
P0741
TCM detects TCC slip greater than 130 RPM for 5 seconds with a TCC commanded ON pressure of 500 kPa or greater. This must occur 2 times during the same ignition cycle.
P0742
TCM detects the TCC slip is between -50 and +30 RPM for 1 second or greater when the TCC is commanded OFF 8 times during the same ignition cycle.
Action Taken When the DTC Sets
P0741
* DTC P0741 is a Type B DTC.
* TCM inhibits high gear.
* TCM initiates the Hot Mode shift pattern.
* TCM commands the TCC OFF.
P0742
* DTC 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
DTC P0741 is a Type B DTC.
P0742
DTC P0742 is a Type A DTC.
Diagnostic Aids
When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions. Ensure the transmission fluid level is correct and there are no leaks.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views Fuel Pump and Level Sensor Assembly
* 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
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 DTC P0716, P0717, P07BF, or P07C0 was set
Diagnose that DTC first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
• If DTC P0716, P0717, P07BF, or P07C0 was not set
3. Verify the transmission fluid level and condition is correct. Refer to Transmission Fluid Level and Condition Check Transmission Fluid Level and Condition Check.
4. Ignition ON, engine OFF. Clear the TCM DTC information with a scan tool.
5. Perform the Road Test Road Test.
6. Verify DTC P0741 or P0742 did not set.
• If a DTC sets
Refer to Circuit/System Testing.
• If DTC 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 range. Refer to Line Pressure Check Line Pressure Check and Solenoid Valve Pressure (Gen 1) Solenoid Valve Pressure (Gen 1).
• If the line pressures are not within the specified ranges
Refer to Fluid Pressure High or Low Fluid Pressure High or Low.
• If the line pressures are within the specified ranges
3. Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair.
4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test. Test all solenoids on the Q8 control solenoid valve assembly. A pressure change should occur for each solenoid tested.
• If a pressure change does not occur for each solenoid tested
Replace the Q8 control solenoid valve assembly.
• If a pressure change occurs for each solenoid
5. Verify the conditions listed below do not exist. Carefully inspect each component for that condition. Repair or replace as necessary.
P0741 or P0742 - Fluid Pump Assembly
Torque converter clutch control valve stuck/sticking - debris, binding, damaged valve, or scored bore.
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 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.
P0741 - Channel Plate and Spacer Plate
Oil channels or orifices blocked by debris.
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.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic repair.
Note: Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
* Refer to Control Module References Control Module References for control solenoid valve assembly replacement, programming and setup.
* Perform the Transmission Adaptive Values Learn Transmission Adaptive Values Learn following all transmission related repairs.
* Perform the Torque Converter Removal Torque Converter Removal and the Torque Converter Installation Torque Converter Installation.