twister96

Hey i've got a 2001 ram 2500 2wd cummins with an auto trans, That is not shifting into overdrive. It shifts beautifully through all other gears just not overdrive. any suggestions?

Mechanos

1. O/D Switch In OFF Position. 1. Turn control switch to ON position.
2. Overdrive Circuit Fuse Blown. 2. Replace fuse. Determine why fuse failed
and repair as necessary (i.e., shorts or
grounds in circuit).
3. O/D Switch Wire Shorted/Open 3. Check wires/connections with 12V test
Cut. lamp and voltmeter. Repair damaged or
loose wire/connection as necessary.
4. Distance or Coolant Sensor 4. Check with DRB� scan tool and repair or
Malfunction. replace as necessary.
5. TPS Malfunction. 5. Check with DRB� scan tool and replace
if necessary.
6. Neutral Sense to PCM Wire 6. Test switch/sensor as described in
Shorted/Cut. service section and replace if necessary.
Engine no start.
7. PCM Malfunction. 7. Check with DRB� scan tool and replace
if necessary.
8. Overdrive Solenoid Shorted/Open. 8. Replace solenoid if shorted or open and
repair loose or damaged wires (DRB� scan
tool).
9. Solenoid Feed Orifice in Valve 9. Remove, disassemble, and clean valve
Body Blocked. body thoroughly. Check feed orifice.
10. Overdrive Clutch Failed. 10. Disassemble overdrive and repair as
needed.
11. Hydraulic Pressure Low. 11. Pressure test transmission to determine
cause.
12. Valve Body Valve Stuck. 12. Repair stuck 3-4 shift valve, 3-4 timing
valve.
13. O/D Piston Incorrect Spacer. 13. Remove unit, check end play and install
correct spacer.
14. Overdrive Piston Seal Failure. 14. Replace both seals.
15. O/D Check Valve/Orifice Failed. 15. Check for free movement and secure
assembly (in piston retainer). Check ball
bleed orifice.

dozer12216

Does the engine get to normal operating temp?
Does it have any codes, check through odometer.