Need advice

Just bought a 2011 jeep wrangler about 3 months ago about 2 months after buying it the check engine light came on said it was the torque converter clutch so I did a flush and a filter change (recommended by my mechanic) when he opened up the transmission there were no flakes in the pan it looked great he said now a month later same code comes back on doesn't shift hard or slip or anything before I take this whole damn thing apart any suggestions on what to check next?

 

I'm no expert by any stretch. A bad sensor?? If your not experiencing any extreme differences in the shifting , leaks, overheating.and what not. That would be my first thought...

 

knowing the code numbers would help.

I suggest you DIAGNOSE before disassembling the unit.

I know of no code that would only say "converter clutch'?

FYI This transmission 42RLE uses ATF4 fluid - not universial or 1 type fits all just ATF4.

 

I'll post the whole code when I get it scanned

 

That's the code that's coming up

 

Had a PO700 generic code that required a pro-level scanner to determine the issue affecting my vehicle which turned out to be the shift solenoid. YMMV so check this out:

"Diagnostic Steps for P0740 DTC

Wiring harness - Check transmission wiring harness for damage or loose connections. Use a factory wiring diagram to locate the appropriate power source and all connection points between circuits. The transmission may be powered by a fuse or relay, and triggered by the TCM. Disconnect the transmission harness at the transmission connector, power source and TCM. Check for continuity inside the transmission internal wiring harness by locating the appropriate + and - pins for the torque converter clutch solenoid. Using a digital volt ohm meter (DVOM), set to ohms scale, check for resistance in the circuit with the positive and negative leads on the appropriate pins. If resistance is extremely high or over limit (OL), suspect a fault with the internal harness or the TCC solenoid - removing the transmission oil pan may be necessary to further diagnose the TCC solenoid. Test the wiring between the TCM and the wiring harness connector at the transmission case using the DVOM set to ohms. Check for a possible short to ground by moving the negative lead on the DVOM to a known good ground, resistance should be very high or over limit (OL).

Torque converter clutch (TCC) solenoid - Check the resistance in the TCC solenoid and internal transmission wiring at the transmission case after removing the transmission harness plug (if applicable, some makes/models use a TCM bolted directly to the transmission case). Some makes/models use a transmission wire harness with the TCC solenoid and internal harness as a single unit. The DVOM should be set to ohms scale with the positive lead and negative lead on the pins for the TCC power and control circuit. Resistance should be within manufacturers specifications, if it is very high or over limit (OL), remove the transmission oil pan to inspect the solenoid inside the transmission if possible. Check for voltage on the power side circuit of the TCC solenoid or at the wire harness connector at the TCM with the DVOM set to volts scale, positive lead at the wire being tested and the negative to a known good ground with the vehicles key on/engine off, battery voltage should be present.

Transmission control module (TCM) - Since the torque converter clutch is only activated during certain driving conditions, it will be necessary to monitor the TCM with an advanced scan tool to determine if the TCM is commanding the TCC solenoid and what the actual feedback reading is at the TCM. The TCC solenoid is normally controlled by a duty cycle to engage a more comfortable torque converter cluch engagement. To test if the TCM is actually sending the signal, a graphing multimeter set to duty cycle or a digital storage oscilloscope will be required as well. The positive lead is probed into the wiring harness plugged into the TCM and the negative lead to a known good ground. The duty cycle shold be the same as being commanded by the TCM in the advanced scan tool reading. If the cycle stays at 0% or 100% or is intermittent, re-check connections and if all wiring / solenoid is OK, the TCM may be at fault"

 

Holy crap....

 

lets not panic -
have you been off road- deep water, mud, or any towing ?
Your jeep is STOCK? no BS as in chips, programs, add on's modifications?

See if your scanner will read 'freeze frame' - post info if yes.
Did you confirm ATF4 was used?
I am not familiar with that scanner - will it show ALL codes?

 

My jeep is stock no off road yet and ATF4 was used no other modifications that I know of just put simple stuff on it like head lights not sure how to use the scanner that well got it when I bought the other jeep same make model and year but I can have my mechanic check the codes