No fourth gear

MIKEWRIGHT35

MEMBER
1998 DODGE RAM
5.2L
V8
4WD
AUTOMATIC
162,000 MILES

P1391: Loss of Cam or crank and P0783: 3-4 Shift solenoid malfunction. A couple weeks ago it would stall shifting from second to third, go to higher rpm's before hitting third, then would dump into fourth. Now the the day after I pull codes it now shifts fine 1, 2, 3 then no fourth. At about 2800-3000 rpm's at 60.

4 Replies

JONNYB1963

MECHANIC
252 POSTS

Hi Mike,

Thanks for visiting us here. Let me start by asking about the first code you mentioned. Was that a typo? Did you mean a P1391?

Second, regarding the P0783. Please take a look at the diagrams below.

Also let me know about the first code in your post.
Regards
Jon

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Saturday, May 1st, 2021 AT 6:03 PM

MIKEWRIGHT35

MEMBER
3 POSTS

Yes, I apologize I did mean P1391.

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Saturday, May 1st, 2021 AT 6:03 PM

MIKEWRIGHT35

MEMBER
3 POSTS

And what are you suggesting I do with those pictures, seems like I need to preform a TC-50A test? Confused on the information you provided.

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Saturday, May 1st, 2021 AT 6:03 PM

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

If I can jump in here it sounds like the PCM might be bad. Can you clear the codes and then without starting the engine turn the key on then rerun the codes? Here is a guide:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

How does the engine seem to run? Please let me know.

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Saturday, May 1st, 2021 AT 6:03 PM