Question about Chrysler Voyager

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Hi, Got a Chrysler Voyager 3.3 on a 2002. Car in limp mode and speedo not operating. Fault code (P1698 no canbus message) Changed two speed sensors on side of transmission, all fuses ok and re soldered connection behind dash or dials (a forum suggested this could be couse). Please advise next step and or location of TCU (Transmission Contron Unit)so that this could be tested. If possible please also email response to salim_mangera@hotmail.co.uk

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  • bentvalves May 15, 2009

    the QUESTION was, WHERE is the TCU????????

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How is your transmission shifting?
the reason I ask is because your code is a communication loss code between the TCM and the other module(s). It's not uncommon for the wiring problems to develop in the harness that runs from the PCM in front of the battery to the TCM on the Pass side inner fender. Look around where the harness is tie strapped to the transmission pan. it's common for the wires to break or be full of water especially after somebody has had the pan off or the transmission has been removed for repair. Can also be a wiring problem right at the PCM or TCM connector or the TCM itself TCM is transmission control module)
although not as likely as a wiring issue.
when communication is lost the transmission will go into limp mode which is 2nd gear and stay there. Sometimes it will come back every time the van is shut off. Not an easy fix but on the plus side not an overly expensive one if you're gonna tackle it yourself. You'll need a scanner that will give you input and output speed sensor readings and a wiring diagram. TCM's should be reasonably cheap used or even new, not sure haven't priced one in forever and the wrecking yard are full of them and even the connector(s) should they be required

Posted on Aug 04, 2008

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How can you tell if a new gearbox is needed other than a Ecu which has been replaced


have the fault codes read first
if the car is moving in limp mode with no obvious noises or problems , replacement of the box is a total last resort
light on the dash and limp mode can be transmission or engine or both but the fault codes will show the problem area
The ECU -- engine control unit or ECM --engine control module gets messages from the transmission control module ---TCM--and that TCM controls solenoids and servos , vss and other items that if faulty will put the car in limp mode
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It sounds like your transmission is going into the limp mode. The transmission goes into limp mode to protect the transmission from major damage. You either need to take it to the dealer or to a transmission shop to have a diagnostic test done.

Jul 13, 2009 | Chrysler Voyager Cars & Trucks

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Have u checked w/ scan tool for codes? If not, have garage, dealer, or parts store (free service at most parts stores) check for stored codes, and as u know, Chrysler is known for their c_rappy trannys,. I just had mine rebuilt at 125k (I changed the fluid and filter every 30k, but still failure). Limp mode is to protect from further damage, so something is going on. If no stored codes, drop the trans pan, check for metal in pan and on magnet, color of fluid, burnt odor? Let me know what u find. good luck

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