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Dodge Repair/01 Dodge Durango: rpm rises/code 0420

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QUESTION: I have an 01 Dodge Durango and for the past 2 days I have noticed that when I'm driving and get up between 60 and 65mph my SUV hesitates and revs up till about 300rpm's for couple of seconds but when I'm over or below those mph's it runs fine.

ANSWER: Hi Gene,
I assume this has an electronic automatic transmission. If that is the case then the best approach is to use the self-diagnostic capability to find if there is a fault code that the transmission control module had logged into its memory which will give an indication of the problem and then based on the manual what are the possible fixes. Try the ignition key to get the code: turn it "on-off-on-off-on and leave on" doing that in 5 seconds or less elapsed time. Then watch the odometer window on the cluster to see if the mileage reading is replaced by a 4-digit number preceded by a P. Let me know what shows up and we'll go from there.
Please see the PS below and respond to it.
Thanks,
Roland

---------- FOLLOW-UP ----------

QUESTION: I did the diagnostic testing you said and got the code P0420 where odometer window is.

Answer
Hi Gene,
That 0420 code relates to the engine, not the transmission. It says that the efficiency of the oxygen sensor on the right side cylinder bank is either degraded, or there is an exhaust leak on that pathway. or the catalytic converter is damaged/worn out, or something is wrong with the cylinder function of the right side.
With no code for the transmission having a fault it is difficult to know what to make of the rpm situation you described. Does it seem to be downshifting when that happens, or is it slipping in gear? I would keep checking for a new code in the 700's or 1700's which are where the transcodes are located. Then let me know.
Thanks for the rating and nomination.
Roland

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Roland Finston

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Get a Free Fast answer to your repair question about a Chrysler/Dodge/Plymouth car, minivan, SUV, or truck. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty. This free troubleshoot advice forum helps you diagnose faults, minimize repair costs or do-it-yourself.

I answer questions seven days a week and respond to you in about 30 minutes. "Maxed Out" means I am answering another question or asleep overnight so try again later.

I have do-it-yourself experience (50+ years) and a library of 100 1982-2012 Chrysler factory shop manuals and 20 multi-manual Chrysler Corp. CD's.

I was voted "Top expert" from 2010-2015 here at AllExperts, and have answered 20,000+ questions.

Experience

Five decades as a 'do-it-yourselfer' on domestic and imported cars

Organizations
Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)

Education/Credentials
Degrees in Physics/bruised knuckles.

Awards and Honors
"Top expert" of 2010, 2011, 2012, 2013, 2014, and 2015 here at Allexperts. Quickest "average response time" at Allexperts (currently no. 1).

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