Will not drive or reverse

Asked by Mar 19, 2017 at 09:39 AM about the 1997 Jeep Wrangler Sport

Question type: Maintenance & Repair

Check engine lite came on. Coded P0740.  Then
while I was driving it would not go into gear. It was
is a 6 cyl auto

1 Answer

75,525

By the sounds of this it can be repaired. Should take it to a good transmission shop for repair... P0740 JEEP - Torque Converter Clutch Circuit...Possible causes; Low transmission fluid level, Dirty transmission fluid, Faulty torque converter clutch solenoid valve, Torque converter clutch solenoid valve harness is open or shorted, Torque converter clutch solenoid valve circuit poor electrical connection...Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop. Possible symptoms, Engine Light ON (or Service Engine Soon Warning Light) Transmission shift shock Vehicle may not shift into the highest gear... P0740 JEEP Description; The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter. Lock-up operation, however, is prohibited when A/T fluid temperature is too low. When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

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