TRANS FAULT. Sluggish accel, no OD. Codes p0700 and p0605

SC RIGGR · **Posted:** Sun Oct 28, 2012 10:03 am

Our '05 Sport has decided it doesn't have OD now. It came to us with the F37 already done. I recently accomplished the TB and water pump procedure, many thanx to the contributors on that subject. I feel the OD problem is likely electrical. I have tried the key cycling while driving, but no tricking into overdrive. I also tried to clean and reseat the TCM connector, and I am starting to check the harness.
The sluggish start feels as though the brakes are applied, but no excess heat at the hubs. RPMs go to 1900 before it begins to move. Could this be TCM failure or the Torque converter? After searching this forum, only one other had both codes. He said he replaced the TCM and most problems went away, Does a TCM need to be programmed or are they generic? Any thoughts would be greatly appreciated. Norman

I have checked trans and diff fluids, and connectors on trans., all appears ok. Also the Cruise light comes on, but no workie, the same with OD button.

Goglio704 · **Posted:** Sun Oct 28, 2012 11:14 am

The TCM is not programmed specifically for your VIN number like the ECM is. It does "learn" or adapt to both your driving and the shift characteristics of the transmission.

papaindigo · **Posted:** Sun Oct 28, 2012 12:01 pm

Get a copy of the 06 FSM for code translation (05 FSM lacks that). P0700 just tells you that there is a tranny code stored which might go away after 3 clean runs. P0605 is a "memory" type code that per the FSM might trace back to the PCM and bad contacts which might match up with your cruise problem.

I'm not quite sure what you mean by an OD problem. The OD button doesn't engage OD it disengages it (second press rengages and IIRC so does a key cycle). With the engine running at idle and the tranny in Drive if you press the OD button you should see an OD off light on the left side of the instrument cluster; press again and the light should go off. If OD is working and you have the F-37 TCM program then the final shift point (5th in OD) should be about 63-64mph and at a "real" (GPS checked) 62 mph the tach should read about 1800rpm if significantly higher then OD is not working. That said you imply a lack of power which could be lose of boost due to leak in the turbo to intake circuit (hoses, intercooler, FCM, etc); bad boost pressure solenoid; bad vacuum lines to turbo vacuum reservoir; gummed up turbo vanes; or lack of fuel (air in fuel, clogged filter, leaky injector, etc).

A bit more information might be helpful.

SC RIGGR · **Posted:** Sun Oct 28, 2012 12:21 pm

The Trans seems to be in limp mode. It does not shift up past 3rd. The OD light and switch work correctly with no change in upshift. The engine is turning 2700 at 55 mph. The lack of power is driveline related,the engine revs and pulls hard. pulling it on the ramps was difficult. I could hear the turbo spooling up, and the Jeep would hardly move. I just swapped the TCM relay with the (unused) Fuel pump relay( nice to know there is a factory-supplied spare relay). about to do another test drive. N

result = no change. Codes reappear after clearing. Now checking harness for power to TCM

SC RIGGR · **Posted:** Sun Oct 28, 2012 3:01 pm

Ok I've traced the wiring from the relay to the corresponding pins on TCM connector. I have continuity from the TCM relay to connector. However with the key on ,the trans relay is not getting a control signal. The only place I can see in the FSM diagrams for the relay signal is the TCM on pin 15. If there is no signal, does this indicate bad TCM? There is B+ power on pin 56 @ TCM.
dare I jumper the relay connector?

SC RIGGR · **Posted:** Sun Oct 28, 2012 8:31 pm

Does anyone know how test a TCM?

SC RIGGR · **Posted:** Tue Oct 30, 2012 3:29 pm

I have checked grounds and power to TCM. It all checks OK. Today I took the Jeep to two transmission places. The first said the TCM is bad after checking his computer network of similar problems, But he only talked to me and did not even test drive! The second place said they found debris in the pan and wanted to tear it down, but found nothing specific. It is now at a Hendrix Dealership, I told them of my EGR mods. Not the SEGR,but the EHM and my FCV disconnected. The Jeep already has the F37 done so I am not too worried about a reflash. wish me luck. N

SC RIGGR · **Posted:** Wed Oct 31, 2012 9:11 am

The stealer called back and said it is the TCM.. It has to be shipped from ATL. It should be here tomorrow. If I had one to reflash it would have been cheaper to get the GDE eco-tune.

SC RIGGR · **Posted:** Mon Nov 19, 2012 11:37 am

We have the Jeep back. While it was there I called and had them add a Trans flush and filter change. When I picked it up, the "Service Advisor" told me the original quote was off since he did not realize the Libby has 2 trans filters. He was nice enough to discount the part from the final bill.

The module came to 515 with a 125 core= 390
labor 1.4 hours = 182
12 qts of ATF @ 7.95! = 95.40
trans filters and sundries = 201
labor = 95
Grand total = 905.
Ouch. I probly would have done all this at a local shop if the Libby was mine. Alas it is driven by my wife and usually has my 2 yr old daughter. It seems to be shifting a lot smoother but the same shift points as before. The first tankful was only 22 mpg. hopefully that will rise again as the TCM "learns".

Joe Romas · **Posted:** Mon Nov 19, 2012 7:59 pm

SC RIGGR wrote:

The first tankful was only 22 mpg. hopefully that will rise again as the TCM "learns".

I don't know your (her) driving style but 22 MPG of all city driving with the possibly of winterized fuel where you are 22 is good :BANANA:

With summer (non winterized fuel) I average 22-24 under those conditions.

TRANS FAULT. Sluggish accel, no OD. Codes p0700 and p0605

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