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How do i repair the dreaded NO BUS message on my 1999dodge…

Customer Question
how do i repair...
how do i repair the dreaded NO BUS message on my 1999dodge ram 3500 dually with a 5.9l diesel automatic transmission?
Submitted: 2 years ago.Category: Dodge
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Answered in 15 minutes by:
2/25/2016
Dodge Mechanic: Don - Mo Lurch, Aftermarket & Factory Electronics replied 2 years ago
Don - Mo Lurch
Don - Mo Lurch, Aftermarket & Factory Electronics
Category: Dodge
Satisfied Customers: 21,468
Experience: Cert. Dodge & Chrysler Warnty, Heavy Line Mech, Mobile Electronics. Sales, Installation & Repair for 30 years
Verified

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sorry for the delay............
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Greetings...... “Hi, I’m Don (aka MOLurch) and I look forward to helping you!”
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NO BUS means there is NO Communication between the Instrument Cluster & the ECM
You will need to Connect DRB III Scan Tool (or equal) to Test Communication between both the Cluster & the ECM.
Typically it is the Cluster, as they are known for bad solder joints
You will need to know how to go over the Circuit Board with a soldering Pen
Otherwise, have a Shop connect to the vehicle & Test the Components to help "pinpoint the cause"
There are Shops that you can send the Cluster or ECM to for Repair

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Customer reply replied 2 years ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Dodge Mechanic: Don - Mo Lurch, Aftermarket & Factory Electronics replied 2 years ago

sorry.....not able to call..........

Please respond here
Without the use of Scan Tool, this will just be guessing

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Customer reply replied 2 years ago
ok thanks I do have a shop with a snap on scanner so I will wait till morning to see what they say after it is checked out. it done this after the temp gauge started to fall back to a cold engine situation and check engine light flashing when gauge would drop out then come back oup to normal range if that helps.
Dodge Mechanic: Don - Mo Lurch, Aftermarket & Factory Electronics replied 2 years ago

still can be Cluster or ECM
I lean toward Cluster
Remove & take the Cluster apart to check the Circuit Board.
In some cases, the Cluster can short the ECM, so even after repairing Cluster, the ECM may show bad
Be sure to check ALL Connections at the Cluster & ECM
Clear Trouble Codes
Disconnect Battery & touch battery cables together
Reconnect & have a look

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Customer reply replied 2 years ago
Thanks I think there would be a better answer to this issue as I am a DIY type of person. I will seed what my shop people have to say in he morning . So you say it may need both the ecm and cluster replaced before it is over with.
Dodge Mechanic: Don - Mo Lurch, Aftermarket & Factory Electronics replied 2 years ago

There is no better answer, until you know what the cause is.
You won't know the cause until you isolate the problem
Either the Cluster, ECM or wiring
sorry you expected a "simple answer", but you are at the vehicle with hands on......I am at the computer with no hands on
Let me know what you find

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Customer reply replied 2 years ago
I did not expect a simple answer I just was looking or so direction as to look for in this matter I know it is frustrating and will get it figured out I hope. Thanks
Dodge Mechanic: Don - Mo Lurch, Aftermarket & Factory Electronics replied 2 years ago

Hope you do to........
As stated......Cluster, ECM or wiring is the cause with Cluster being #1
We usually pull the Cluster first & go over the complete Circuit Board, soldering ALL points with spy glass
IF that does not work, we send it out for reman
Next is the ECM....we just send those out
Good luck & let me know if you need further

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