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944AMMO
Dodge Dakota
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5/13/2004
00:34:38

Subject: "no bus" electrical problem
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I've got "no bus" showing where my odometer mileage is supposed to be, erratic gauges, no stereo, no compass, and every warning light in the info center is on, including the airbag light. Is my computer going bye-bye? It seems to be running fine though. ( 4.7 L ). Help!!



BeachNutt
Dodge Dakota
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5/13/2004
06:36:37

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I have no personal experience with your problem but from what I've seen in here your computer is on its way out. Although I seem to recall others having that show up on their odometer saying their trucks wouldn't even start much less run good. Best of luck to you.



ticats
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5/13/2004
08:04:25

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Just working through a checklist. Any of the following symptoms?

Remote Keyless Entry Malfunction
Interior Lights Will Not Come On
Intermittent Wipers Will Not Function
Chime Malfunction
Power Door Lock Malfunction
Remote Radio Switch Malfunction (if equipped)



944AMMO
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5/14/2004
03:50:30

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None of those seem to be a problem. Interesting note...I pulled the positive battery cable to do some fuse checks, and when I put it back on about 20 minutes later, everything was almost ( repeat almost ) back to normal. Now only the airbag light stays on during driving, the passenger airbag "off" light wont come on when it's switched off, and the stereo seems to power up for a minute or two every now and then go completely dead. The guy I got the truck from said he recently pulled the stereo to replace it, but put it back when he decided to sell the truck. Could he have screwed something up in that process??? Thanks for the help!!!!



ticats
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5/14/2004
06:41:43

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A good possibility. I put down that checklist because sometimes there is electromagnetic interference (e.g. from an aftermarket stereo, a hipo cb, etc.) with a certain bandwidth that will cause the Central Timer Module to malfunction. The CTM send the signals to the dash pod unit via the CCD bus that are needed for the gauges to operate. It sounds like the problem may still be stereo related. When you disconnected the positive cable it unlock the CTM. Interestingly I had read that disconnecting the negative cable might or might not unlock the CTM. Glad to hear it's almost back to norm :-)



Izzy
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5/14/2004
08:22:16

pulled this off another forum, hope it helps
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gators
I have a '99 durango with ~45000 miles. Recently it has been breaking down on me. I feel it lose power until it dies all together. After about 20 minutes it will start again. This has happened 5 times. When it happened today, I was going about 30 mph, when I felt it lose power. The speedometer went to '0" - the 'check engine light came on', the 'fuel pump' light came on (like it does when you run out of gas), then I had this odd message on the odometer that said "NO BUS". This time I had it towed to Pep boys w/o trying to crank it with the hopes they can get a code. I told them about the "no bus" message but they did not seem to know anything about it. I have found this metioned on a few bulletins boards but not with much info. I think perhaps a Service Bulletin from Dodge said something about this. Does anyone have any ideas as to what "no Bus' means and perhaps if this is the cause of me breaking down. What can I do to get it fixed ? Please help. .Thanks!

Yesterday, Pep Boys said they were not able to get any codes from it. They are at a loss. Somewhere I read it was a loose wire harness somewhere..........but where? Where do I begin. Please help.

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CDunk24
Take it to a Dodge Dealer and have them check the PCM (Power Control Module). Mine started going out at 30,000 with the same symptoms. PCM's are covered under the 8yr/80,000 mile drivetrain warranty which is a good thing because the part runs about $700 but only takes 20-30 min to replace. Keep in mind, PCM's are very difficult to diagnose. The only way my mechanic could get it tested was to run it idle for 30 minutes and wiggle on the PCM for it to do the exact same thing with losing power and NO BUS in the odometer. Some might say something about voltage from the battery to the PCM which is erroneous because of the alternator passthrough, if voltage were an issue you'd be losing electric windows, radio and trip console electrical as well, which mine never did.

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PARTSMAN88
i also had the same problem ..Very had to find...What we did find was that the circuit board in the pcm was getting hot and warping and breaking a circuit causeng the vehicle to shut down...didn't care how fast or how big of a hurry ( my broke going to lunch with my wife on our 20th anniversary) as a temp. fix I learned that I could wiggle the connections at the pcm and hear the fuel pump click back on..

good luck

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uberboo
I had the same issues with my 99 Durango (52K miles, purchased April 03) - truck died at stops and stop lights, especially when it was over 90 degrees and the A/C was on. Took it in to the Dodge dealership (thinking my purchased extended warranty would cover me). $650 dollars later....I had a cracked PDM (covered by 8/80K emission warranty) and a dead BCM (not covered by any warranty).

Good luck.

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durango1
I also have a '99 Durango with 50000 miles. Recently it has been breaking down on me. I feel it lose power until it dies all together. After about 2 to 20 minutes it will start again. This has happened 25 times. I have taken this vehicle to two shops one being Tom Madsen Dodge in Auburn Washington who claims to be a "five star dealership" They assured me they would take care of this problem so I left it there only for them to tell me that they could not fix a problem that does not exist. I realize that intermittent problem are hard to fid however given all the information pertaining to the problem how is it that they have never heard of such a thing?? Today I was traveling at about 60 MPH and I lost all power. Tach and Speedo went to zero. When I tried to restart I noticed that there were no reading on any gage and the "no Bus" message appeared an this time I cant restart so I open the hood and gently wiggle the connections at the PCM and I hear relays kick on and then my vehicle runs again. This is a serious problem and I am not amused by this situation. I had it towed to my office w/o trying to crank it. When I got there it was like nothing was wrong. Does anyone have any input as to what’s next .Thanks?



944AMMO
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5/14/2004
14:21:10

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Thanks for the responses...I've got an appointment with the dealer ( echhhh!!! ) on Monday to see about righting things. Fortunatly, it's still driveable. Till then I'll be checking other threads and forums for more info and post what I find.



Kowalski
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5/15/2004
08:16:21

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"No bus" usually means the computer is having trouble getting info from something; it could be a problem with PCM, or just a connection or sensor. You might get more info pulling up some codes. Is that the only code you pulled up, or did it just come up on its own ?



944AMMO
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5/15/2004
12:26:09

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That's pretty much all I've got so far. I hope to get more information when they hook it up to the machine at the dealer. The gauge snafu hasn't happened for a while, but the airbag light is still on. I'm still hoping it's just something simple that happened when the stereo was interchanged. I'm hearing from other sources that there are different degrees of " no bus " malfuntions- everything from a totally dead vehicle to just some irritatingly intermittant gauges. Hope my problem doesn't cost a fortune. Thanks for the response.



944AMMO
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5/17/2004
20:13:50

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Just got off the phone with the dealer...they said my problem was the passenger airbag switch. That doesn't quite sit right with me. Guess I'll see when I go get it and drive it around awhile.



Izzy
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5/19/2004
09:25:19

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Theres no telling what the problem is.

I had a Sh!tsuzu....I mean Isuzu truck a few years back that lost all computer function.

It turned out to be a blown fuse for the reverse lights and the PCM was on that curcuit. The fuse block only read Reverse Lights, nothing at all about it being a PCM circuit.

It cost me almost $350 to replace a stinking fuse.



944AMMO
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5/21/2004
09:46:12

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It looks like the switch really was the problem. Amazing. It's been 200 miles or so and no more malfunction.



Tom Christoph
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7/11/2009
21:08:52

RE: 2002 dodge Dakota
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I have a 2002 Dodge Dakota and just had a complete trans overhaul and I left drove about 5 miles and it turned off and would not start again.any suggestions?



chuck
Dodge Dakota
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8/13/2009
21:32:12

RE:no bus on a 2002 dakota
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thanks for all the info I was driving home today doing about 55 plus a few got off my exit from I-95 my water temp and battery guage went to zero and my rpm's & mph were maxed out my truck shut down and the odometer said no bus I checked out some of the info on line and tried some of the things and this is what worked for me with the key on I moved the wires on the ECM heard the relays click and tried to start the truck it ran long enough to get home going to try to repair tomorrow hope I can fix it



Derek
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11/17/2009
02:38:11

RE: 99 Dakota with the "no Bus" issue
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like im reading, this seems to be a common issue. ive read what info has been offfered here and have kinda looked things over but have not come up with a solution. it starts and runs for a minute or so then dies. i cant even scan it when it says "no Bus". any further help??



robert
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12/13/2009
22:51:22

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does the pcm have anything to do with the fuel pump not working im geeting a no bus sign on a 2oo dodge dak. v6 motor please help got to get to work so i can feed my family




Forseti
Dodge Dakota
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12/14/2009
10:19:47

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The "NO BUS" points to PCM communication failure. If a code scanner cant communicate with the PCM then you have a fault with either the harness connecting the PCM to the truck or the PCM is fried. Disconnect the battery unplug the PCM harness connectors and make sure the connection is clean and dry then plug them back in .. reconnect the battery and see if that worked. IF you haven't modded your engine too much the PCM is covered under the emissions warranty which I believe is 8 years 80,000 miles so it should be replaced for FREE. Some dealers will flash the PCM with an update to get it working again then tell you it was a switch so they don't have to deal with it and get you past your warranty before it fails again so your SOL.



Kevin
Dodge Dakota
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9/04/2010
13:40:03

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I have 2008 Dodge Dakota V8 and it has shut off on me three times at random times, then started back up like nothing was wrong. The first dealer could not diagnose the problem, but found codes for the pcm, the ignition, and the airbag. Dealer said they couldnt fix it without being sure what the source of the problem was. So now I am at a loss with a new vehicle because Dodge is incompetent in diagnosing their own vehicles!. Anyway, it sounds very similar to what 944ammo was experiencing and maybe it is an airbag switch that is somehow throwing everything else off. Weird... Just to add to the problems, this time I went to the dealership they told me they didnt have any qualified to run a diagnostic there on Saturday although the service department was open. Hell, my grandmother can plug in a diagnostic tool and read the codes! Anyone else have any info?



2000blk4dr
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2/06/2011
20:32:47

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I have a 2000 and recently replaced the front right fender (unbolted pcm(i think) and 2 ground wires) when done the truck started right up ran for 30 seconds and shut off. Now it won't start, odometer reading flashes i think 4 times and then reads "no bus" Turns over fine and i hear the fuel pump running. I tried disconnecting t neg terminal twice with no luck.. Any ideas?




gman
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2/18/2011
20:42:53

RE: pcm
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a component or components inside the pcm get hot and become intermitant and as time goes on the failures occur more often. underhood heat and outside air temps will affect operation or the components inside the pcm adversly... basically you have a bad pcm. it is ntermittant and will eventually sooner than later crap out.



2000blk4dr
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2/19/2011
00:51:22

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solved my problem. It was a bad ground on the new fender.... too much paint i guess. So guys if you are having bus problems be sure to she the 2 ground cables running to studs on the front right fender. I just jumped to the battery and the problem was gone.....pretty cheap fix. A bad ground will do funny things.



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