Question about 2005 Dodge Ram 2500 Truck

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2005 dodge ram 2500 with a hemi the criuse control turns off at 62mph,the ecm and the output speed sensor was replaced.

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  • ryan ross Jul 12, 2010

    2005 dodge ram 2500 gas engine cruise turns off at 62 mph

  • ryan ross Jul 12, 2010

    05 dodge ram 2500 gas engine the cruise turns off at 62mph

  • ryan ross Jul 12, 2010

    i am finding out that there are other people with this concern just at different speeds

  • ryan ross Jul 12, 2010

    i am finding out that there are other people with this concern just at different speeds

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4 Answers

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  • Master
  • 1,857 Answers

You will need to put a diagnostic scanner on the car to see all the wheel sensors. If any one has a glitch at a given speed the cruise will shut off. Also if you have a vacuum leak somewhere on the engine or under the dash for the vent controls this could cause this, Without a scanner all anyone can do is guess. Its possible you have a computer issue but one would have to eliminate all the other possibilites first.

Posted on Jul 12, 2010

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Posted on Jul 12, 2010

  • ryan ross Jul 12, 2010

    this vehicle has not been modified it has original tire size and the speedo is accuarte.

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  • Dodge Master
  • 6,826 Answers

Accel, resume, decel switches in order?
Is the cruise control actuator ok?
When it shuts off, is it just coasting down or does it actually maintain that speed?

Posted on Jul 12, 2010

  • 4 more comments 
  • ryan ross Jul 12, 2010

    when i turn the cruise on the light comes on,on the dash then i will drive up to 62mph and the cruise light will turn off by itself and i can not turn it back on until i slow down to under 62 then it will turn on also i will set the cruise at say 60 and it operates fine then i will push accel and as soon as it gets to 62 the cruise light turns off and the cruise will be inop until i slow down,my understanding is there is only the ecm and the cruise switches,there is no vaccum no servo no cables its all controlled by the ecm.

  • Duane Wong
    Duane Wong Jul 12, 2010

    You're right,



    When I looked at the schematic the accel, resume, and decel switches were in order and the ecm was part of the circuit as well.



    And, the cruise light tells you when it shuts off.



    And, it shouldn't behave that way, unfortunately.



    And, you already replaced the ecm.



    That's about all you can replace except the wiring harness between the ecm and the actuator for the cruise control.



  • Duane Wong
    Duane Wong Jul 12, 2010

    I've never heard of this occurring on a Dodge Ram 2500 where you change main parts and it doesn't work.



    Do you have any aftermarket security systems or lights on it?

  • ryan ross Jul 12, 2010

    what do you mean by the actuator,and there are no lights on at all,no codes its as if you reach down and manually turn it off the weird thing is its speed related i cant figure out why it would be a electrical problem when it only happens at 62mph and faster,are you talking about the throttle body assembly being the actuator

  • Duane Wong
    Duane Wong Jul 12, 2010

    Yes, I may be using the incorrect terminology.



    I wasn't saying that there is a vacuum operated cruise control.

    It seems like it's all electronic or electric.



    And, you've pretty much, according to what you said, replaced everything

    except the wiring harness.



    That's why I think it could be located there.



    You see, when wires are thin or close to ground or have exposed wiring inside the

    harness, things can act like they have gremlins in them, so to speak.



  • Duane Wong
    Duane Wong Jul 12, 2010

    It is a weird problem. Glad it didn't happen to my car. I'd be mad.

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  • Master
  • 2,272 Answers

It's common for the cruise control system to operate on vacuum, so check the vacuum hoses for the cruise control system. Check that the brake light and clutch pedal position switch (if equipped) are adjusted properly and operating properly. Checking for power to the cruise control unit would be the first thing, then checking to see if the brake and clutch switch (if equipped) are within adjustment. If the cruise control thinks you have your foot on the brake or clutch, it won't work. If these things are okay, then you can check the switch to see if it's working. cruise control works when the main switch is turned on and the road speed is more than 25 to 27mph. Then press "set" , the car will accelerate or decelerate and stay at that speed. If you apply the brake pedal, clutch pedal, or turn the main switch to off the cruise control will cancel. If you maintain speed in access of 25 mph (approximately) you can press the resume button and it will reset back to the speed you had set. Remove the Air Bag from the steering wheel and reinspect the wiring connectors to the Cruise Control switches. One is likely not connected or is getting short. The Cruise Control switch inputs go to the Powertrain Control Module (PCM). The PCM actuates the Cruise Control Servo. If the Cruise Control stops after certain mph then check this switch. check fuses, vacuum hoses to the servo, brake switch, cable to the throttle body and all associated wiring connectors. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Jul 12, 2010

  • ryan ross Jul 12, 2010

    this vehicle is not equipped with a vaccum controled cruise,its all ecm controlled,there is no cruise control module no servo and no cable to the throtle body,its all controlled by wires,also the cruise operated normal under 62mph,my understanding the only components are the switches in the steering wheel and the ecm

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