derfernerf
Member
130,000 miles. auto trans. I'm having a problem, the transmission sometimes downshifts over a bump between 20MPH and 50MPH. It hasn't happened on the highway, but it is a "violent" downshift, and then goes back to the gear I was in, so the car "jolts". Not sure if it has anything to do with it or not, but my speedo also seems to stop working over bumps for a quick second. Say at 70 MPH, I hit a bump and it will drop to 50ish, then go back up to normal. This is preventing me from using cruise control.
The only CEL code I have was P0421- Warm Up Catalyst Efficiency Below Threshold (Bank 1). No flashing O/D light
I also did a trans flush yesterday, if that makes a difference or not...
The only CEL code I have was P0421- Warm Up Catalyst Efficiency Below Threshold (Bank 1). No flashing O/D light
I also did a trans flush yesterday, if that makes a difference or not...
