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Have 06 lincon zephyr ! some times shifts hard prematurely at low speeds! dealer says needs new trans and that updating pcm/tcm software would not help! seems crazy that o6 with only 80k on it can not

Have 06 lincon zephyr ! some times shifts hard prematurely at low speeds! dealer says needs new trans and that updating pcm/tcm software would not help! seems crazy that o6 with only 80k on it can not be fixed any ideas?

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Crazy as it sounds a hard shift is a good sign that you have a good transmission. i don't know this particular transmission but weather it is controled buy manual valves or a computer i believe the problem will be with that part of its control, a restrictive valve or stopped up modular.

Posted on Nov 22, 2014

Testimonial: "thanks tom. yeah it runs shifts fine under hard acceleration! does not leak or heat up but once in a while under normal driving at lower speeds it makes a nasty bang! not at shift points!"


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Posted on Jan 02, 2017

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SOURCE: 2002 Dodge Caravan, Tranny would shift, DTC P0700, P0725

replace the input speed sensor to transmission and the wiring pigtail all are available at your chrysler dealer take your vehicle registration in to the parts counter so they have your vin # to get the right part and it is the front of trans by fluid linres to radiator.

Posted on Mar 08, 2009

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SOURCE: the car stalls intermittently displays codes


Posted on Oct 03, 2009

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SOURCE: where is the tcm for 2002 dodge intrepid

I too have a 2002 dodge Intrepid, after 10 minutes of driving the car, when i make a stop it won't shift properly, in order to make it shift, i have to turn the ignition off and back up again!
If anyone can help me locate the TCM that would be great.
I'm ready to drive it off a cliff
Thanks in advance!

Posted on Apr 26, 2010

  • 104 Answers

SOURCE: 06 mazda 6 battery was

Sounds like you may have fried the tcm I would go to and get a good used one. You could check and see if there is any fuses that you blew out that control the tcm if you have a manual for the car you can look at a wiring diagram and find out what fuses are associated with the tcm if not check them all.

Posted on Nov 30, 2010

  • 749 Answers

SOURCE: 1999 Chrysler Concorde LXI 3.2

This sounds as if the input and output speed sensors may be having an issue. If you are putting a used tcm in it will have been powered down and basically reset to it's defaults.Would completely disconnect the battery and hold the cable ends together this will force a hard reset of the tcm and ecm which will return all adaptives to the factory presets.When started it may run very poorly for a few minutes until it relearns. You then should be able to drive it and it will continue it's adaptive learning curve.

Posted on Dec 01, 2010

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2002 Jeep Cherokee does it have a modulator valve on it to keep it from shifting into 3rd

Jeeps have an ECM ( Electronic Control Module) on the transmissions as well as the engine.

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2010 suzuki swift glx ez07 update. is the body control module in this model interchangeable between an automatic and manual transmission

welcome to USA forum.
is your car in USA, seems not, right? where are you on the planet earth, (not ur address) a COUNTRY , matters....
we dont know what trans or engine is in your car.
so how could we guess?
why not ask suzuki this complex question, it might only need reprogramming, as is so common now.

The BCM does not shift automatics, why are you looking in there.
the TCM does that, and is part of the PCM on all modern cars.

did you scan the PCM first. that be first
to see if the TCM portion is barfing out DTC errors for the 4speed.
auto. that be first after checking fuses and connectors to trans.
and AFT levels correct, not guessing method.

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wow no year stated, its 1996 and never but how new
its a KK or KJ jeep 2002 to now. 14 years of jeep.
as is what transmission used, and if 2wd or 4wd.????
first the p0700 code
ONLY, means
1: SCAN TOO you using is junk, and old,
2: means the TCM needs to be scanned by self. to see all codes in the TCM.

my guess is you need a real scantool..

700 means, trans has errors, stored, ASK IT NOW.

1: fuses good,
2: is TCM plugged, in? some Liberties have seperate PCM and TCM.
3: the TCM most see all sensors working (where ever it hides)
if not , it will not ever upshift.
speed sensors dead, or not plugged in?
PCM cant talk to TCM.// oops....
and more.
the problem is your tools, (missing a real jeep scan too)
my INNOVA 3160 can see those errors, but ive never done a liberty, in fact i don't consider it a real jeep.

The TCM is JUST a computer (a simple microprocessor)
it has inputs and outputs (shift solenoids)
if the inputs lie, it can not shift or shifts wrong, or goes to limp home and skips gears.
all TCM work like that, and not scanning it is a FAIL.

you must scan it fully. to get all CODES.

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1 Answer

New 30rh transmission was installed in my 97 4.0l jeep wrangler and it shifts in all gears except for 3rd! even when it downshifts it goes through all gears but 3rd? please help

why not ask installer that.
btw , the TCM can fail and do that.
that is either a separate module or part of the PCM.

The TCM does all shifting. electronic, shifting it is.
the TCM has scan code errors, did you scan it and the PCM for errors.
if not , why not.????
2>3 shift failure.

even a loose or corroded , trans wired connector can fail.
or the tranny ground strap is missing.
saw a guy replace a tranny 3 times. and all 3 times failed.
he never knew the trans must be grounded perfectly .
his was missing, others simply broken, others rotted away.

what we do is make sure the TCM is sending the correct
voltage single 0v.12v, etc. to the transmission solenoids.
if not, the TCM is bad, or is in limphome. or inputs wrong.

TCM have what is called limphome that can skip gears.
my 4speed skips 2nd , in limp, by DESIGN !
all this is covered in the FSM, why not read it.
or look at it's there too.

i also have a switch box, i made., that attaches to the tranny
allowing me to make a manual transmission,
if that works the tranny is good.

the TCM will in fact mess up if its inputs are wrong
just like all computers do.
inputs are, TPS, VSS1 , VSS2, engine heat. shift selector switch PRNDL , and others.
The TCM shifts by the state of inputs. period

one cool thing, some cars pre 98, or so
the TCM is separate box. and with it unplugged
the shifter is now a manual transmission car. (for test or?)
have friends driving like this for 3 years.

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2002 Dodge Grand Caravan I just put a master computer on. Is there a way that I can reset it? The engine runs fine so I know it works but it wont shift properly.

Hope you put a PCM in. TCM is in side the PCM. The TCM sometimes needs a brake in period. 200 miles. If not call the dealer to have then flash the PCM with the updates. Around $80 at the dealer. Tell them you want to FLASH to PCM for bump shifting. Any Chrysler, Jeep or Dodge dealer can do this in 1 hour. Thers a Chrysler TSB #2101807 Dated 10-27-07 about Transmission Reprogramming. If the dealer put the PCM take it back tell them about the TSB

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I cant find the transmision dipstick and my

well you cant find the dipstick for the simple reason there is no dipstick,,,you have a VTI or CVT transmission,,with operates like a snowmobile transmission,,anyhow it takes special transmission fluid,,very expensive,,,,Saturn had alot of problems with these transmissions,,,,what i would try is take your car to the dealer and have them change the trans fluid and do the latest TCM update for the trans,,this can do wonders for these trans,,,,,and if that dont work youre gonna need a new trans,,,,,which is alot like $5000-$7000 installed,,,,there was a factory exteneded warranty to 150k miles but when GM went thru bankruptcy they ditched it,,so you will now have to incure costs to fix it,,,thanks GM..,the trans fluid change and tcm update ,, TCM trans control module,,will cost about $350,,hope this helps

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I had the fluid in my transmission changed and they did not use type 4. They also left it 1 1/2 qts low. this caused shifting issues that have not corrected after putting in the correct fluid. I wa

I am a chrysler tech. when flashing your vehicle I beleive you update the pcm. It is a two step flash that also programs the Tcm region of the controller. This can fix some issues with coast down shifts or harsh shifts but rarely fix a trans. shudder.

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2005 Mazda6 tranny ****

1. some mazdas had a PCM/TCM update to resolve 1st to 2nd shift shock. the only one who can update the is the dealer. maybe covered under 5 year 100,000kms powertrain warranty.

2, have you ever had the transmission fluid replaced? it could be dirty, burnt, etc.
if it was replaced, maybe it was replace with fluid other than M5 fluid. different fluids have different properties (thickness etc) which could cause serious problems if left.

I would recommend taking it to the dealer for the update and a transmission flush (not a drain and fill) using a flush machine.

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