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sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 22655
Experience:  ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
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Dodge 4x4 2500: 1998.5 dodge 2500 5.9 Cummings. auto trans.

Customer Question

1998.5 dodge 2500 5.9 Cummings. auto trans. problem with starting jumps in and out when in 3rd and over. I did alternator, batteries and all the grounds. it was cured for awhile and it's starting again. an auto trans. man checked the computer and founded a P1389 code- no automatic shutdown relay output voltage at PCM and; P1692- fault in companion engine control module. what do you recommend...js
Submitted: 2 years ago.
Category: Dodge
Expert:  sprinkles08 replied 2 years ago.
Hello and welcome to JustAnswer!
If it's falling out of gear then an internal issue is likely but it's more likely that the trans is up and downshifting on it's own. This could be caused by quite a few things but is most often caused by an erratic accelerator pedal position sensor signal.
Is it up and downshifting on it's own while driving at a steady speed?

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