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2003 2.7 grand Cherokee holds in low gear when cold it's an auto box

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2.7? diesel, the engine we dont have,, in USA.
Turbo diesel;?
so what up, ELABORATE please.
WJ JEEP is a USA jeep, in Europe its a WG, jeep, and runs different engines and trans,
yet another post with no country, like most here, and FAILED.
what does holds in low gear mean.?
try to know that engine power and a/t shift points are complex.
means, tell what works and not, pretend the helper is blind
and has no hands nor legs. bingo.?

now my wild guess, based off 2 words.
hold and lowgear.
i guess you are saying the engine runs perfectly with full power.
but the transmission will not auto up shift from 1st gear to 2nd,
is this correct?
if yes,

  1. check transmission fluid levels. do not overfill it, or guess.
  2. check fuses, we test them.
  3. if the trans , fails, now, the Diesel has a special version of the transmission, not petrol box. and most have an external TCM controller, unlike ours, totally. but it must be SCANNED.
  4. or you will never know why failing !
  5. The scans will show errors, telling you why the TCM tranny brain, can not shift, (sensors errors? comm errors/ many...)
  6. there you go, there is more, but illl stop here, the service manual tells you in clear English , all on car checks for tranny. if read.

my WG book, shows even Diesel shift'er module, is unique
and can not communicate, and fail.
and the TCM is controlling all this.

Learn to scan all modern cars first (means 96'+)
and save time, and money.
guessing will not work. sorry.

if you had scanned it and posted errors we could wax 10x more savvy, for sure.
  1. buy a scanner use it. (save big money for life of car)
  2. Get it scanned. (all shops can)
  3. call mobile car service, and they scan it?
  4. tow car to any shop they scan it.
our cars show P07xx codes. for trans or P17xx.
in Europe they have EOBD, (simular to our OBD2, we invented)
so that is your tool, that works. (wild guessing country I am)

here is one example
P27xx , are all trans errors, lots

this means the PCm can not talk to the TCM box.
if it cant, the the PCm can not send engine load data to it.
or worse.
service manual, WG , chapter 21, covers all this.

Posted on Dec 30, 2016


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