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Dodge Ram Warning Lights and Trouble Codes



  • paul122paul122 Posts: 1
    any ideas on how to trace it down
  • corkscrewcorkscrew Posts: 254
    P0138 is high voltage in oxygen sensor 2 located rear of catalytic convertor. Possible causes:
    1 Faulty oxygen sensor
    2 Short in sensor circuit
    3 High fuel pressure (not very likely but keep this in mind)
    Check O2 sensor and look for short in signal circuit.
  • bobwinnerbobwinner Posts: 47
    kcram, thank you. I had the 04 cummins 3500 with no rpm above idle, I had some sickness, and am late answering you. My fan WAS turning. I switched the throttle position sensor (AFT??) with an identical truck, and now BOTH are fine. Thank you.
  • bobwinnerbobwinner Posts: 47
    On a recent trip, I drove my 2004 Ram 3500 Diesel (Auto tranny, 95,000 miles) about 400 miles, no problem. I ate lunch and resumed my trip. 2 miles later, truck would not pull away from traffic light. Added 2 qts tranny fluid, which ran out below truck. Hauled truck home, replaced front tranny seal. At engine start, place in drive, after 3-5 seconds Truck has strong first or reverse, but what should be a shift to second is instead neutral. Kill and restart, and again I have a strong first or reverse for 50 ft, then neutral . Especially welcome comments from kcram and dustyk. bobwinner
  • tiger38tiger38 Posts: 6
  • KCRamKCRam Mt. Arlington NJPosts: 3,516
    Depends on how long that seal had been leaking (or if that's not the only issue). You also want to look at the lines to the radiator/cooler - if those have failed, they can take the trans with it if not addressed in time.

    With only first and reverse (and for just a short time each time you try to run), it sounds fried. When the fluid you added came straight through to the ground, that was likely a sign that you were dry and the major damage was done.

    I have the same powertrain (Cummins and 47RE) in my 05 3500, and so far, my trans has been just fine [knocking on wood]

    kcram - Pickups/Wagons Host
  • KCRamKCRam Mt. Arlington NJPosts: 3,516
    typo there... 48RE, of course.

    kcram - Pickups/Wagons Host
  • 800bomber800bomber Posts: 1
    how do i test the leak detection pump on a 02 ram with a 4.7 a/t 4wd , there are no evap leaks
  • henr001yhenr001y Posts: 1
    Year Make Model: 2000 DODGE RAM VAN Wagon B2500
    Engine: 5.2L V8 SFI OHV 16V

    leaking AC gasket won't hold freon
    Some lights on dash remain on at all times
    Doesn't chime when headlights are left on while van isn't running

    How do I change the gasket?
  • frukfruk Posts: 1
    I had a engine light come on about 2 years ago and it was a o2 sensor problem. The engine light has come on again, how do you check for a code without having to go to the dealer? I tried the ignition swith to on,off,on,off,on. to no avail. Pep boys?

    Dodge Ram 1500 quad Cab
    2004 5.7 ltr hemi
  • I have a 99 dodge extended cab with 160000 miles, this past week the ABS light and Brake light indicator lamps came on at startup as always, however the lights will not go off. Brakes and everything is working fine, I am sure it is a sensor, but the parts houses are telling me that the abs is a different system that the check engine light. They want to sell me an ABS computer to check the issue.. I find it hard to believe that all of this is not monitored through the same computer.... Is this true or not, and does anyone know what sensor is the likely culprit...The Speedo is working fine, so I know its not that one
  • ebroadyebroady Posts: 3
    Go to any auto parts store Advance, Auto Zone, Napa or Pep boys and they can check for the code.
  • Located to the right of the brake light is a TRIANGLE SHAPE LIGHT. What does it mean when the triangle light is on? Is it a service light, if not then what is it?
  • wesbrillwesbrill Posts: 1
    The engine light came on,I took it to Advanced Auto parts,they told me the code was EGR fault.i know this is a dealer part.Can I put this on myself?May this code clear itself up?i put fuel injector cleaner in.
  • admireadmire Posts: 3
    Can anyone help me with what this is or how to fix it. I have tried things like the gas cap, but the code comes back after a few days.
  • stanoskistanoski Posts: 76
    Same thing happened to me, not the gas cap, some sort of canister. Is covered under warrantee if you have one.

    Ski in TX
  • corkscrewcorkscrew Posts: 254
    Egr position sensor performance.Since it's part of 5/50 government emission warranty you may be able to have the dealer do the repair. If not, it is located behind the alternator attached to the front of the right cylinder head:
  • admireadmire Posts: 3
    Thank you for your help
  • admireadmire Posts: 3
    Thank you I have ordered the EGR valve and will try that.
  • Got a '99 Dodge Ram 1500 and had massive sensor problems. Three hundred and plus dollars later I suddenly get a MIL warning. The Scanner pulls up a P0740 Code.
    Anyone got a solution to this problem? Never had a torque converter clutch circuit malfunction before...
  • boogs1boogs1 Posts: 2
    I have a dodge 2007 1500 ram 4.7 v8 all of a sudden if wont get out of 2nd gear. Took it to a zone it read out The trans input rpm does not match the out put rpm. What is this? My son put super chip on it for gas saver, but put it back to stock could this have anything to do with it? :sick:
  • rerobirerobi Posts: 2
    I've got a 2004 RAM 2500 4X4. Auto Zone was kind enought to plug in and let me know why my Brake Light, ABS and Check Engine light was on. In addition, my AC button light will not illuminate, nor will my mirror defrosters. His little gadget told me I had a P0501 code and after he checked his system for a part, he indicated he didn't have the one called out for a vehicle Speed Sensor - and that I need to get it from the dealer. However, he did have the Transmission speed sensor for like $16, but not the "vehicle speed sensor". Does this make sense that there are two different speed sensors? Anyone else run into this? Where would the vehicle speed sensor be located? Thanks for any help!
  • I'm a new member. I have 2001 Dodge Ram 2500 w/ the Cummins diesel. A few days ago, I got a "no bus" message on my odometer, and none all of my gauges/instruments stopped working. The low fuel, ABS, check engine, and airbag lights also came on. On the overhead display, all readings showed "CCd", except for the elapsed time. The truck still started and ran fine, but the warning lights listed above would come back on shortly after starting each time.

    Yesterday, all but the check engine light went off and the gauges started working again. Then, today, the check engine light went off. All seems fine now, but I'm wondering if the symptoms described lead anyone to conclude what the problem is/was (Gremlins!).

  • Did you find out what this was? My husband has a 2002 Dodge Ram as well and had the exact same thing happen this morning to him. Thanks!!
  • Haven't had any replies yet, but what I gather from reading other posts in this forum is that the "no bus" message means that the instrument cluster or the part of the system that communicates with it isn't getting getting a signal to the instruments. What may have fixed my problem (besides prayer) is that I checked all the wiring connections from the fuse module under the hood to the ones under the dash. When I got under the dash, the main connection (located toward the outside of the dash or door side, and fairly obvious due to its size) had come loose from its bracket. I made sure the wiring connection itself was securely connected and then placed it back in the steel bracket. I don't know if there is some kind of grounding connection required that is established by the bracket or not (I doubt it), but it was the next day that things started to work. I also recall reading somewhere in the posts in this thread that it takes a few starts and shut-offs or a few trips over a certain speed to clear some of the warning codes and lights, so perhaps the jiggling and re-bracketing the main plug like I did fixed the issue(s) and the lights just took 1-2 days to clear.

    Hope that helps. Hopefully, one of the gurus like Dusty or Kcram will get on and give you some help. You might also consider taking it to a reputable shop (if you know of one) and having them just run a diagnostic (hooking it up to their computer) to get a start on the diagnosis. I think prices for that run the gamut, but it shouldn't cost you more than an hour of labor just to rn the computer check.

  • rerobi,

    Try this post - #833 of 1168 Re: no speedomiter [orman] by dustyk, in the "Dodge Ram Transmission Problems" thread. It's on page 43 of 59 I believe. It may help. They may be referring to the rear wheel speed sensor.

  • I'm a new member. I have 2001 Dodge Ram 2500 w/ the Cummins diesel. A couple weeks ago, I got a "no bus" message on my odometer, and all my instruments stopped working. The low fuel, ABS, check engine, and airbag lights also came on. On the overhead display, all readings showed "CCd", except for the elapsed time. The truck still started and ran fine, but the warning lights listed above would come back on shortly after starting each time.

    Last week, I checked all the wiring connections in the fuse box under the hood, and the wiring connections between there and under the dash. The only thing I found was that the largest of the plugs, toward the drivers door under the dash, had come loose from its "mounting bracket", so I put it back in the bracket.

    The next day, all but the check engine light went off and the gauges started working again. Then, the day after that, the check engine light went off. All seemed fine until yesterday, when a couple of hours into a trip, all the lights came on again and all the gauges went to zero.

    The truck still runs fine and the cruise control even still works, but I'm getting no "data" from the truck. I've read through several other posts, including the one on Engine codes and transmission problems, but can find very little info on the "no bus" message. Anyone have any ideas? DustyK are you still out there?


  • KCRamKCRam Mt. Arlington NJPosts: 3,516
    "No bus" means your dashboard has lost connection with the computer. The truck will continue to run because it doesn't require the dashboard to do so, and the computer is maintaining info such as mph and odometer in its memory.

    This was a common occurrence on Rams of that timeframe... a trip to the dealer will cure it.

    kcram - Pickups/Wagons Host
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