Mechanics

CHRYSLER NEW YORKER LIMP MODE PROBLEM

1990 Chrysler New Yorker • 180,000 miles

My transmission won't change to top gear, I have checked the fluid level and is at full level.
It was working fine than started to have intermittent fault where it wouldn't change to top gear. If I stopped the car and switched the motor off for a few minutes and with the motor off I selected all the gears a couple of times. Than re started the motor it would work fine.
I did that for a month with daily normal city driving, but now though I can drive the car it just doesen't change to top gear.
Can you please help?
Can you also tell me if the Chrysler voyager transmission is the same as the New Yorker. I believe mine is "A604" model
AD
Avatar
Guest
October 28, 2012.




That is indeed an A604. It goes by a different designation today but the design is the same.

Staying in second gear is "limp mode". That allows you to drive slowly to a repair shop without needing a tow truck. You already learned that you have to turn the ignition switch off to get it out of limp mode. Once it defaulted to limp mode, there will be a diagnostic fault code stored in the Transmission Computer. Having that code read will identify the circuit or system that needs further diagnosis. In general, if it starts out right away in second gear, it is usually a sensor or electrical problem. If it goes back to second gear during or right after a shift, typically an up-shift, it is usually due to slippage in a clutch pack.

The problem with slippage is years ago that caused sloppy or mushy shifts that gradually got worse over 100,000 miles and we got used to it, then we'd marvel at how crisply the transmission shifted after it was rebuilt. With Chrysler's design, the computer detects how much fluid it takes to apply each clutch pack so it knows how much wear has taken place in each one. Every up-shift has the timing modified to overcome that normal wear and make it undetectable to the driver. That means it might engage third gear a little sooner before it releases second gear. The problem is you have no way of feeling that sloppiness or knowing it's occurring, ... Until the day it can't update any further. Then slippage occurs which sends it into limp mode.

Caradiodoc
Oct 28, 2012.


AD