I have an 05 Montego w/6 speed AT/trans. At 54K miles it has recently develped a transmission shudder when slowing at 35mph and 25mph. I have also noticed the shudder when accelerating at highway speeds climbing a hill when I hit passing gear. The shudder appears worse as the vehicle heats up.
I took it to the dealer and after $288 (diagnostic, computer upgrade, and transmission fluid change) the problem has not been fixed. Their recommendation now is to "replace the module" which costs $1000 plus $400 for labor. (Interesting the diagnostic check does not check the module??) By the time I'm done, I could easily have invested $2K and still not have the problem fixed. There are some TSB posts on harsh shifting ~ though I don't know exactly what the complete post is. (Could be related to any of those listed below.)
MFG Bulletin Date: 20050124 Component: POWER TRAIN / Bulletin Summary: HARSH OR ERRATIC UPSHIFTS/DOWNSHIFTS - WRENCH LAMP ILLUMINATED WITH DIAGNOSTIC TROUBLE CODE (DTC) P2544 - VEHICLES BUILT BEFORE 1/7/2005 AND EQUIPPED WITH THE (AWF21) 6 SPEED TRANSAXLE. *TT
Harsh or erratic upshift or downshift and wrench lamp with P2544. PCM and TCM flash (Reprogram of software).
MFG Bulletin Date: 20050905 / Component: POWER TRAIN:AUTOMATIC TRANSMISSION Bulletin Summary: HARSH/ERRATIC/SLOW DOWNSHIFTS OR TIP-IN HESITATION -- 6 SPEED AUTOMATIC TRANSAXLE -- VEHICLES BUILT BEFORE 10/17/2005. *TT
Vehicles built before 10/17/2005, harsh/erratic/slow downshifts or tip-in hesitation. Involves PCM and TCM flash.
TSB 07-26-9- Supercedes TSB 06-24-5MFG Bulletin Date: 20071224- 20061115 previous TSB / Component: POWER TRAIN:AUTOMATIC TRANSMISSION / Bulletin Summary: TRANSMISSION HARSH SHIFTING - NO DTC'S - MILEAGE OVER 20,000 MILES. *KB
Vehicles built before 3/31/2006, Trans. temperature higher than 212*F, during 5-3 downshift at 35 MPH or 4-3 downshift at 20 MPH with throttle open 50% or greater a hard shift and/or clunk noise, Delayed shift and/or perceived slip/engine flare. Depending on mileage and wether or not DTC's are present, could be a TCM flash, a TCM flash a fluid change and valve body if fluid is clean, if fluid is very contaminated a TCM flash and a transaxle replacement.
MFG Bulletin Date: 20041213 / Component: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM) / Bulletin Summary: GENERAL POWER TRAIN CONTROL MODULE (PCM) PROGRAMMING PROCEDURES. *TT
Only deals with procedure for flashing PCM.
If it wasn't paid off ~ I would have already traded it in on something else. Any other suggestions??
The newest TSB is 07-26-9 is the latest TSB on AllData (aftermarket service info site) The software for this TSB would cover all previous TSBs you listed. I'd seriously doubt it's a controller, unless they found a specific code that led to module replacement.