My p0420 on dodge 1500 ram 2002 with 91,559 miles came on. I checked and it was my catalytic converter 1 of 1. i went and bought a new eastern catalytic converter on sale for 300.00 it retails for over 800.00 drict fit replacement. It ran like new for around 45 miles and bang now the lights back on same code same mining a little slow on shift and i have a five year old flowmaster 40 series on it it at least sounds better

SOURCE: 2002 dodge ram 2500 diesel

I'm no expert, but I am on my second Dodge. I have a 2004 Ram 2500, 125k miles on it. I traded in my 2001 1500 with 99k on it.
Your problem sounds like one of two things that happened to me. At 110k mi's it was not accelerating properly, particularly between 40 and 50 mph. It turned out my torque converter was going bad and I ignored it for too long and it's disintegrated pieces ruined my transmission. I recommend getting over to Aamco right away or to the dealer if you are still in warranty and have the TC checked out. The diesel is just too much torque for a torque converter on the automatic transmission, but manuals are too much of a pain these days. $2300 at Aamco to have the TC replaced and the tranny rebuilt.

The new problem I have now is when it acted like it was out of fuel and then wouldn't turn over after it died. My fuel lift pump (diesels have two of everything and the expensive one is always what goes) has gone bad and is currently being replaced, $700 part, plus another few hundred in labor.
Hope this helps.
B

SOURCE: 1997 Dodge Ram 1500 Transmission Shifts Slow

Have you changed the fluid and filter every 2 yrs or 36k miles?
Are you using atf+4 only?
If all the above are a yes then check the throttle cable to the transmission as it should be adjusted to move at exactly the same as the throttle and it they are out of adjustment the transmission will not shift at the correct time and wil eventually cause early failure,also after a rebuild the tranny has to be reflashed by a dealer

Jerry Koski

• 443 Answers
• Posted on Apr 27, 2009

SOURCE: intermitent no bus problem on 2003 dodge 1500

check all relays .. relays after getting hot will shut off what ever they run.. so check them closely .. they are in your power distribution box under the hood and the lid usually has a diagram of which is which.. Relays are good at cooling off and working right a while too so look these over . or change the ones you think are the right one.. thanks Jerry

SOURCE: 2004 dodge ram 1500 rear brake light out how to replace?

Well once the tail gate is open and you take out the 2 screws on the light fixture . the light assembly shall pivot towards the outside of the box. some manipulating but the assembly shall come out.
The bulb needs a simple twist and pull .... Plug and play..

SOURCE: check engine light on code

This trouble code is Evap Purge System Performance fault. 1) Check for a loose or missing fuel cap. 2) Check for a damaged or missing fuel cap seal. Recheck for other trouble codes. This fault wont cause the stumblering problem. It turns on the MIL lamp to say there leak in the EVAP system.