Question about 1999 Dodge Durango
Transmission will operate correctly 1, 2, and 3 but will not go into 4th or overdrive the computer is sending the instruction but the trans is not acknowledging it.
The overdrive button on the column is not reaponsive when engaged and disengaged as if the switch is intermittently nonoperational, signaling the light to come on the dash.
The light comes on suggesting the overdrive is off but it still will not shift to 4th.
When the light is off and the overdrive is supposed to be engaged on the trans again it will not shift into 4th or overdrive.
I am trying to make this vehicle correct for a friend that has little or no money so any help would be greatly appreciated.
4th gear is shifted electrically. If you have a 4.7 engine the following advise does not apply(different trans) but most likely culprit it the output speed sensor
in tail end of the trans.The PCM uses TPS, vehicle speed, output speed sensor and OD switch to know when to shift to 4th. 4.7 engine uses a 45rfe trans and would require a scanner to diag.
Posted on Oct 18, 2008
Sounds like a stuck valve. I'm still new to transmission stuff so I could be wrong. he could probably get a transmission rebuild book and maybe just do it himself. it would be the cheapest unless you knows someone
Posted on Oct 14, 2008
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following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem.
engine and the automatic transmission (transmission control is only
for automatics, engine is still computer controlled no matter the
transmission type) in this vehicle are computer controlled and in
most cases when a fault occurs a fault code is stored in the memory
of the computer control module. There are exception to this, such as
the Mass Airflow Meter and fuel pressure problems. What must be done
is to have all the basic testing done such as a scan of the system
for fault codes as well as a check with a live data scanner tool for
engine functions that are not within range of normal, a trained
technician is required to know what is correct and what isn't, then
based on careful diagnostics done from a factory repair manual the
correct part is replaced or the wiring repaired or the computer
replaced (known as the PCM), which is very rarely the problem. Other
basic checks must be done as well such as mechanical problems with
the engine as well as engine state of tune and mileage on the engine.
The transmission can have mechanical issues as well such as no gear
engagement at all or a failed pump or other pressure related
problems. Also engine mechanical problems ca cause many
drive-ability related problem such as rough idle and other symptoms
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