Cause of Failure

WARNING: This page is about a different car, the 2004 Suzuki Swift + and 2004 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.

Lockup solenoid
Inside automatic transmission (A/T)
Inside valve body
TCM

DTC P0742 (Non Europe or N. American Emissions)

Step	Action	Yes	No
1	Turn OFF the ignition. Install the scan tool. With the engine OFF, turn the ignition switch to the ON position. Select Store Freeze Frame/Failure Records from the Diagnostic Trouble Codes Information menu. Store Freeze Frame/Failure Records. Select Clear DTC Information from the Diagnostic Trouble Codes Information menu. Clear DTC Information. Perform 2 vehicle drive cycles. Is the hold lamp ON?	Go to Step 2	Go to Step 6
2	Select Request DTC by Status from the Diagnostic Trouble Codes Information menu. Request DTC by Status. Is DTC P0742 displayed?	Go to Step 3	Go to Step 6
3	Turn OFF the ignition. Replace the master transmission control module (TCM) and perform simulation test again under user condition. Is DTC P0742 displayed?	Go to Step 4	Go to Step 7
4	Estimate the failure of lockup solenoid, lockup clutch or internal valve body. Inspect the lockup solenoid. Refer to Shift Solenoid (1, 2), Timing Solenoid, Lock-Up Solenoid Inspection . Is the condition of lockup solenoid OK?	Go to Step 5	Go to Step 8
5	Estimate the failure of lockup clutch or internal valve body. Is a problem found?	Go to Step 9	System OK
6	Repair the temporary connection failure of the connector. Refer to Wiring Harness and Connector Inspection Diagnosis . Did you complete the repair?	System OK	-
7	Replace the TCM. Refer to Transmission Control Module (TCM) Replacement . Did you complete the replacement?	System OK	-
8	Replace the lock-up solenoid. Refer to Shift Solenoid (1, 2), Timing Solenoid, Lock-Up Solenoid Inspection . Did you complete the replacement?	System OK	-
9	Replace the valve body assembly. Refer to Control Valve Body Disassemble . Did you complete the replacement?	System OK	-