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How about the two ground wires for the PCM. They are the black/tan 14gauge wires at PCM terminals C1 #31 and #32. They go to splice S126 before going to the right side battery. Here is a link to w
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Have you seen this in the FSM? NO LOW GEAR (MOVES IN 2ND OR 3RD GEAR ONLY) 1. Governor Circuit Electrical Fault. 1. Test with DRBT scan tool and repair as required. 2. Valve Body Malfuncti
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Looks like I’ve been able to finally find the issue. There is a failure in the OD solenoid/ wiring. Between pins 5 and 6 there should be 28-68 ohms. I have OL. All other resistances are within spec
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Welcome To Mopar1973Man.Com LLC
We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features. Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.
5.9 Cummins
47RE
No previous issues. Went out one morning, started the truck and trans was in 3rd gear limp mode.
No low gear, No OD
So I jumped the gun without diagnosing and just went ahead and Replaced the typical governor pressure sensor and transducer, however issue remained the same.
Started testing wires and found pin#1 on transmission connector does not have 12v with engine running like it should.
Thought problem was PCM. So I sent it out to be rebuilt and they tested it and said it was good and had no issues when testing it. I Re-installed PCM and issue remained the same.
I tried a jumper wire in the distribution box where the trans relay goes. With this installed I of course get the 12v to the trans connector pin#1 and have gears 1,2,3 and TC lockup. But no OD as the PCM isn’t commanding it I presume.
I found testing the trans relay connector side of the distribution box that the powers and ground are all there to actuate the relay without the relay installed. However as soon as the relay is installed, the PCM kills the ground side of the relay. this happens both when the transmission connector is plugged in at the trans or unplugged at the trans. This leads me to believe it is not an internal trans issue. But the PCM is seeing something it doesn’t like and going into limp mode. I just can’t seem to find what?
I haven’t been able to find any obvious wiring defects. Found a couple possible defects but repaired them with no change to the issue.
Tried another known good PCM from a friend’s truck and issue remained the same.
After doing some more reading today, I’m thinking another possible cause of this could be the ess signal coming from the ecm to the pcm. But not sure how to test this?
you fellas have any other ideas?
Edited by Busadave