cruise control malfunction

[gatorbaitor]

I went thru the process of 'resetting' the transmission shifting points by following the procedure in the service manual (ie n..d..n..r..n..etc.) It made no difference to the slight hesitation at about 1200 rpm. But now the cruise control malfunction light came on and I cannot figure out what I screwed up.

 

[Gunkk]

Rough shifting on older cars is typically the solenoids going bad. Trying the reset procedure will not break the cruise control system. So either you have a problem with both systems (wiring, etc.) or it's just a random coincidence. If the problem is a TCU glitch, removing the negative battery connection for 1 hour to reset it may help.

 

[G-985552]

Rough shifting on older cars is typically the solenoids going bad. Trying the reset procedure will not break the cruise control system. So either you have a problem with both systems (wiring, etc.) or it's just a random coincidence. If the problem is a TCU glitch, removing the negative battery connection for 1 hour to reset it may help.

Thanks. I can remove the CC malfunction light by doing what you suggest but it comes back after driving for more than 30 minutes.
The car has only 25k miles on it and worked perfectly until I screwed with the transmission. Seems more than coincidence imo.
Cheers.

 

[Gunkk]

CC malfunction can be caused by a number of things: wheel rotation sensors, the SCC radar unit and it's control computer, or pretty much anything in the ABS system.

Back in 2017 during evacuation from Hurricane Irma, my 2012's red SCC failure light came on. The HECU failed (one of 4 ABS actuators failed in the pump), resulting in no brakes in one of my front wheels. They fail open, causing zero brake line pressure. An improvement from the 2009 in which the pedal would go to the floor since all 4 wheels were controlled by a single valve (a single point of failure). Anyway, heavy yawing in stop and go traffic on I-75 for 12 hours on the road to Atlanta with a car full of family, luggage, and a pair of 5 gal jerry cans full of gas in the trunk: not good. Fortunately for me it was covered under extended warranty ($2500). But that trip was not fun.

Moral of the story: Don't ignore that red light. Get it checked.