DTC P0741 Sets After Extended Drive Time Or During High Ambient Temps - keywords AF335 clutch converter DTC engage M09 M45 MIL no P0741 SES slip speed TCC torque

This PI was superseded to update keywords and correct Document ID for eSI. Please discard PIP4235.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

DTC P0741 is set when:

1. Torque Converter Clutch (TCC) is commanded "ON"
2. Automatic Transmission Fluid (ATF) temperature is greater than 212°F (100°C)
3. TCC slip speed is greater than 100 rpm for a cumulative time of 12 seconds during the current Key-Cycle

Engineering investigation shows that the root cause to this condition is due to a mechanical concern internal to the TCC assembly (Asm). This mechanical concern can cause residual ATF to become trapped between the front cover and the friction / clutch apply plate internal to the TCC Assembly thus not allowing the friction plate to fully engage / apply intermittently. This intermittent condition is decreased as the ATF temperature increases above 212°F (100°C)

To help ensure that proper diagnosis and to verify / duplicate the DTC, perform the following road test procedure:

1. Using a Tech II, review and record / capture the stored Freeze Frame Failure records
2. If DTC P0741 set with an ATF temperature less than 212°F (100°C), refer to SI document ID #1572225
3. If freeze frame records indicate that the DTC set with an ATF temperature is equal or greater than 212°F (100°C) continue to step #4
4. Clear all prior DTCs and Freeze Frame Failure Records stored in the TCM & ECM
5. Monitor the ATF temperature until the actual temperature is at or greater than 212°F (100°C)

Note: It may be necessary to perform a Stall Test in order to increase the ATF to the required testing temperature. Refer to the Stall Test procedure in SI.

6. With the ATF temperature at the testing specification, begin to road test the vehicle observing the following testing conditions:

•	Accelerate under normal driving conditions until the transmission current gear is fifth and the TCC command is "ON"

Note: Most cases highway conditions are most favorable to achieve testing conditions

•	Release the throttle pedal for approximately 3 seconds

•	Reapply the throttle pedal to achieve a throttle angle reading of 15% and hold this value for approximately 5 seconds

•	Continue steps b & c above while ensuring that the ATF temperature stays above 212°F (100°C) during testing for approximately 5 minutes or until DTC P0741 resets

Note: In most cases, DTC P0741 will set within 1-2 minutes using the above testing procedure

7. Service stock of P/N 24227730 has been supplied of "known good" componets.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.