wilkenms

So, i bought my first cherokee a week ago, a 2000 Xj Sport with 201,xxx miles. after driving it about 200 miles, the check engine light came on, i ran OBD II diagnostics and the fault code is P0740...Torque Converter Clutch circuit malfunction... other than the light, the jeep seems to be running great. Any thoughts?

also, i had the oil changed and now my oil pressure is all over the map (according to the stock gauge, which for the first 250 miles or so was very consistent) can using "high mileage" oil affect this reading??

Any help would be greatly appreciated!

tjwalker

Here is some information on DTC P0740.

SYMPTOM:
P0740-TORQUE CONVERTER CLUTCH CONTROL CIRCUIT

WHEN MONITORED:
During Electronically Modulated Converter Clutch (EMCC) Operation.

SET CONDITION:
Transmission must be in EMCC, with input speed > than 1750 RPM . TCC-L/R Solenoid achieves the maximum duty cycle and can not pull engine speed within 60 RPM of input speed. Also when the transmission is in FEMCC and the engine slips TCC > than 100 RPM for 10 seconds.

POSSIBLE CAUSES:
Check for misfire codes
Intermittent TCC solenoid
Check the TRANS fluid level and condition
Input shaft seals
Internal problem or TCC solenoid
Oil pump/shaft/seals
Torque converter
Valve body

wilkenms

tj, thanks so much. i currently live in an apartment and dont havea spot ro work on my cars, so i ended up taking my jeep to a transmission shop, they diagnosed bad TCC solenoid and need for a trans fluid flush, fill and filter. should have my new toy back just in time for the snow tonight!

tjwalker

Easy fix, and the repairs shouldn't have broke the bank.

Another happy Jeep Cherokee Forum ending!

wilkenms

soooo, the problem is back...it was gone for about 500 miles and then the CEL came back on, and now my engine RPM are a good bit higher than normal when cruising at highway speeds. any additional thoughts...my transmission shop doesn't want to work on my jeep anymore, unless i just replace the transmission with one of their used or remanufactured units.