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 to the TCC regulator valve in the lower valve body and the TCC control valve in the pump cover. When vehicle operating conditions are appropriate to apply the converter clutch, the transmission control module (TCM) will increase current flow to the TCC pressure control solenoid, thereby increasing pressure directed to the TCC control valve. The increase in fluid pressure moves the TCC control valve to the apply position, and moves the TCC regulator apply valve to the regulating position. The TCC regulator valve regulates TCC apply fluid pressure proportional to TCC solenoid pressure. When the TCC is fully applied, the engine is coupled directly to the transmission. TCC release is accomplished by the TCM decreasing current flow to the TCC PC solenoid. This results in decreasing the apply pressure which allows 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 sensor and the engine speed provided by the engine control module.
Conditions for Running the DTC
P0741
* DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, P0742, P2763, or P2764 is not set.
* Engine speed is 400-7500 RPM for 5 s.
* Ignition voltage is greater than 8 V.
* Transmission fluid temperature is between -6.7 to +130°C (20-266°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 2.67-3.07.
- 3rd gear ratio is between 1.71-1.97.
- 4th gear ratio is between 1.32-1.51.
- 5th gear is between 0.93-1.07.
- 6th gear is between 0.69-0.79.
P0742
* DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0401, P042E, P0716, P0717, P0722, P0723, P0741, P2763, or P2764 is not set.
* Commanded range is 2nd gear or higher.
* Ignition voltage is 8.6 V or greater.
* Transmission fluid temperature is between 18-130°C (64-266°F).
* Throttle position is 5 % or greater.
* Engine torque is 80 Nm (59 lb ft) or greater.
* Engine speed is 400-7500 RPM for 5 s.
* Vehicle speed is 1 km/h (0.6 mph) or greater.
* Engine speed is 500 RPM or greater
* Engine torque signal is valid.
* Throttle position signal is valid.
* TCC is commanded OFF.
Conditions for Setting the DTC
P0741
* TCC Pressure command is 800 kPa (116 psi) or greater for 2 s.
* TCM detects TCC slip of 50 RPM or greater for 5 s.
* The above conditions must occur 3 times.
P0742
TCM detects the TCC slip between -50 and +13 RPM for 2.5 s when the TCC is commanded OFF. This condition must occur 6 times.
Action Taken When the DTC Sets
P0741
* DTC P0741 is a Type B DTC.
* TCM inhibits 6th gear.
* TCM commands TCC OFF.
* TCM forces hot mode shift pattern.
P0742
* DTC P0742 is a Type A DTC.
* TCM freezes transmission adaptive functions.
* TCM forces hot mode shift pattern.
* TCM commands the TCC ON.
Conditions for Clearing the DTC
P0741
DTC P0741 is a Type B DTC.
P0742
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 A/C Compressor Clutch
* 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
Note: If other DTCs are set, diagnose those DTCs first.
1. Engine idling, transmission in the Park, parking brake applied, and drive wheels chocked.
2. Verify the transmission fluid level and condition is correct. Refer to Transmission Fluid Level and Condition Check Transmission Fluid Level and Condition Check.
• If the transmission fluid level and condition is not correct
Repair as necessary.
• If the transmission fluid level and condition is correct
3. Ignition ON, clear the TCM DTCs with a scan tool.
4. 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 did not set
5. 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.
6. Verify the DTC does not set.
• If the DTC sets
Refer to Circuit/System Testing.
• If the DTC does not set
7. 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 Solenoid Valve Pressure.
• 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 - 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 - Transmission Case Cover
* 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 repairs.
* Perform the Reset Transmission Adapts Reset Procedure following all transmission repairs.
* Torque Converter Removal Torque Converter Removal
* Torque Converter and Differential Housing, Front Differential Transfer Drive Gear, and Front Differential Carrier Removal Torque Converter and Differential Housing, Front Differential Transfer Drive Gear, and Front Differential Carrier Removal and Torque Converter and Differential Housing Installation Torque Converter and Differential Housing Installation
* Torque Converter Installation Torque Converter Installation
* Control Valve Lower Body and Upper Body Replacement Control Valve Lower Body and Upper Body Replacement
* Control Module References Control Module References for Control Solenoid Valve Assembly replacement, programming, and setup.