Code P0741

Tiny
WJMITCH56
  • MEMBER
  • 2002 CADILLAC SEVILLE
  • AUTOMATIC
On a 2002 Seville a P0741 code Torque Converter CKT stuck off. What is the fix?
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Tuesday, January 18th, 2011 AT 6:27 AM

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Tiny
KHLOW2008
  • EXPERT
This problem seems to be quite common for Cadillacs and it usually is a melted TCC solenoid in valve body.

Here are the diagnostic procedures if you wish to start from the beginning.

DTC P0741: TCC SYSTEM STUCK OFF

Circuit Description
The PCM controls the Torque Converter Clutch Pulse Width Modulation (TCC PWM) solenoid valve. The solenoid controls the hydraulic fluid for TCC apply and release. When the TCC is applied, the engine is coupled directly to the transaxle through the TCC. The TCC slip speed should be near zero.

If the PCM detects high torque converter slip when the TCC is commanded on, then DTC P0741 sets. DTC P0741 is a type "B" DTC.

Conditions For Running DTC P0741
DTC will run under the following conditions:

No TP sensor DTCs P0121, P0122 or P0123.
No VSS DTCs P0502 or P0503.
No ISS DTCs P0716 or P0717.
No TCC stuck on DTC P0742.
No internal mode switch DTCs P1820, P1822, P1823 or P1825.
No TCC PWM solenoid valve DTC P1860.
The engine run time is greater than 5 seconds.
The time since the gearshift lever change is greater than 6 seconds.
The internal mode switch indicates "D2", "D3" or "D4".
The transaxle gear ratio indicates 2nd, 3rd or 4th gear.
The transmission fluid temperature is 68-271 F (20-133 C).
The throttle angle is 10-50 percent.
The engine torque is 32-159 ft. Lbs. (43-215 N.M).
The TCC solenoid valve is commanded on.

Conditions For Setting DTC P0741
DTC will set under the following condition:

TCC slip speed exceeds its limit for a given torque for 5 seconds. See TCC SLIP SPECIFICATIONS table.

Action Taken By PCM

PCM performs the following if DTC is set:
The PCM illuminates the MIL during the second consecutive trip in which the conditions for setting the DTC are met.
The PCM inhibits 4th gear if the transaxle is in hot mode.
The PCM records the operating conditions when the conditions for setting the DTC are met. The PCM stores this information as freeze frame and failure records.
The PCM stores DTC P0741 in PCM history during the second consecutive trip in which the conditions for setting the DTC are met.

Conditions For Clearing DTC P0741
DTC will clear under the following conditions:

The PCM turns off the MIL during the third consecutive trip in which the diagnostic test runs and passes.
A scan tool can clear the DTC.
The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
The PCM cancels the DTC default actions when the ignition is off long enough to power down the PCM.

Test Description
The numbers listed below refer to step numbers in the diagnostic procedure:

2
This step inspects the transmission fluid to ensure that it is at the proper level.

3
This step verifies that the TCC engages when commanded on by the scan tool.

Diagnostic Procedure

1. Did you perform the diagnostic system check? If so, go to next step.

2. Did you perform the transmission fluid checking procedure? If so, go to next step. If not, perform the transmission fluid checking procedure.

3. Install a scan tool. Turn ignition on, engine off. Before clearing the DTC, use the scan tool to record the freeze frame and failure records. Using the CLEAR INFO function erases the freeze frame and failure records from the PCM. Record the DTC freeze frame and failure records. Clear the DTC. Drive the vehicle at 45 MPH. Using the scan tool, command the TCC PWM solenoid valve on. Monitor the TCC slip speed. Is the slip speed -20 to 100 RPM? If so, see DIAGNOSTIC AIDS. If not, go to next step.

4. Inspect for the following conditions:

The TCC control valve is stuck off due to sediment or binding.
The TCC regulator valve is stuck off due to sediment or binding.
The TCC feed valve is stuck off due to sediment or binding.
The oil pressure screen is clogged.
The TCC PWM solenoid valve "O" ring is leaking or cut.
The turbine shaft seals are worn or cut.

Repair any of the above items as necessary. See appropriate OVERHAUL article. Did you complete the repair? If so, go to next step.

5. Perform the following procedure to verify the repair:

Select DTC.
Select CLEAR INFO.
Operate the vehicle.
The transmission fluid temperature is 68-271 F (20-133 C).
The engine torque is 32-159 ft. Lbs. (43-215 N.M).
Drive the vehicle in "D4" with a throttle angle of 10-50 percent.
Ensure that the TCC applies and the slip speed is -20 to 100 RPM for 4 seconds.
Select SPECIFIC DTC.
Enter DTC P0741.

Has the test run and passed? If so, system is okay. If not, go to step
1.

Diagnostic Aids
Inspect the transmission fluid level. The transaxle may be in hot mode. Inspect the transmission fluid lines to the radiator. The lines may be pinched, plugged or twisted.
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Tuesday, January 18th, 2011 AT 3:02 PM

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