Q: Many issues with the car. Can a clogged catalytic converter cause transmission issues?

asked by on

I got this car in June, for free, it was passed from my great grandmother who very rarely drove it, to my uncle, then my parents, then to me. Which meant, I got to deal with all the problems nobody fixed before. I just recently replaced the alternator, belt tensioner, and terminals. The car drove fine for a couple weeks, and out of nowhere decided it didn't want to accelerate past 10/mph after stopping. Figured it was the brakes, went easier on them when coming to a stop, it drove fine for about 3 days. Then all of a sudden my car is extremely loud, and shakes alot while driving, not just when stopped. My dad said my catalytic converter is clogged. Tonight, my o/d off light came on, I noticed it after my car started jolting forward when it would shift into the next gear. I knew automatically it was the transmission messing up. Can a clogged catalytic converter cause these issues with the transmission? I didn't have these issues until this happened all together recently.

My car has 169000 miles.
My car has an automatic transmission.

The catalytic converter has very very little to do with the transmission. The catalytic converter will keep the engine from being able to "exhale" and can cause engine problems and damage if faulty, but it wont cause direct transmission issues. All it does it turn exhaust fumes to other elements that are safer for the environment. The very first step is to get the vehicle scanned for diagnostic troubleshooting codes. Since warning lights have illuminated, the computer may have detected an issue which will help with this diagnosis. The transmission will need to be inspected. The first step is to remove the fluid pan and filter. Here you can check the condition of the oil and filter. You can also check the pan for metal shavings which could be a sign of bigger issues. The transmission fluid may have never been changed or serviced and you will want to make sure its clean. If you would like to have these symptoms addressed, a certified technician from YourMechanic can come to your location to diagnose the loss of power and shaking issues in person so that the correct repairs can be done.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Many issues with the car. Can a clogged catalytic converter cause transmission issues?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Im not sure if its the tie rods that are bad or if its the cv axle... it doesnt click or anything

Typically, if you feel "slack" in the steering, the rack and pinion (or other "steering gear") unit is worn but the tie rod ends (inner and/or outer) could be implicated as well. Vibration or shuddering on application of the brakes...

Q: The code came up crank shaft sensor and replaced it and now won't start

You may have got a bad sensor if the engine was running before the sensor was replaced. Also check connection and installation of sensor for problems. If it still does not start then you will need to have further testing...

Q: Where is the cam shaft position sensor located on a 2000 ford contour 2.0

Codes do not conclusively identify faulty parts. Any part referred to in a code that is suspected of being faulty must be separately tested, that is diagnosed, in order to determine if in fact there is anything wrong with the...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.