Question about 2002 Jeep Grand Cherokee

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Bus communications stop only when running - 2002 Jeep Grand Cherokee

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"No Bus" is a very common message on chrysler vehicles. The first thing to try is a complete computer rest. This can be accomplished by disconnecting the negative battery cable, followed by the positive cable. Then Take the two cable ends and clamp them together for about 3 minutes. Reconnect in the reverse order and start the vehicle.
I have had a high rate of succes with this solution. Sometimes, the "no Bus" message is actually caused by a loss of communication between computer modules due to a true failure, but in MOST cases, it is simply a glitch in the system that confuses the cluster and requires a complete reboot such as this

Posted on Jul 14, 2010

  • Brian Zulu
    Brian Zulu Oct 31, 2013

    Steve Hart, you have proved to have the best solution to this "no bus' problem

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How turn off no bus in my pt cruiser 2001


Hello, it means that the instrument cluster is not seeing messages from the PCI bus, which is how it communicates with the other modules on the vehicle, if you're not having any other problems it's unlikely that the communication bus has failed. You most likely have either a broken bus wire going to the instrument cluster or a failed instrument cluster itself. If you are having other related problems you're either going to have a failed module corrupting the communications bus, or a grounded or shorted bus wire, which will also cause the bus to fail. These are probably the hardest to diagnose problems we see on these vehicles.

The first thing you'd need to do is using a DRB3 scan tool do a module scan to determine if the pci bus is operational. If it is you can then focus on the instrument cluster. If it's not you'll then need to check for shorts to ground and voltage on the pci bus wire, if either is present you'll need to find the cause of the fault.
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What and where is the can c bus on a 2007 dodge ram 1500 5.7. Code u0001?


Can bus C is a serial data communication network that certain modules talk ,share information on ! There can be two or even three different bus networks - A , B , C . One being faster in speed of data transfer then the other ! There are two wire data bus's an single wire ones ! CAN- Controller Area Network is a two wire bus an the wires are twisted together to shield from noise interference . You code U0001 is a communication problem on the bus , a module isn't communicating ! How to Diagnose Controller Area Network CAN This is something best left to a trained technician !

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The Bus communication wiring is either open or shorted some where you will need to diagnose Bus voltages to each module. A Chrysler dealer should be able to do a module scan and see which module is not communicating on the bus or diagnose Bus communication.

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1 Answer

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Vehicles with more then one module , PCM - engine control module , BCM - body control module , EBCM -anti lock brakes , SRS - air bag module etc... all communicate on a serial data communication network .
"NO BUS" means that the communication system between the computers has stopped. How to Diagnose Controller Area Network CAN If the shop can't find a problem your not going to , very complex . There have scan tools and lab scopes to test .

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1 Answer

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What you are seeing is NO BUS. The bus is the vehicle data communication line that runs from all the computers on the vehicle. either you have a corroded or broken wire somwhere on the vehicle or one of the computers has stoped talking to the others. If one stops working it can pull all the rest off line . need a scan tool to try and communicate with each controller. usually it will help steer you in right direction

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1 Answer

There is a drain on the battery somewhere and then all gauges stop working and get code bu5


No bus refers to the communication bus between all the computers. These are the wires the computers share information on.
When you cluster says no bus it means the cluster can't communicate on the bus.
The whole bus network could be down or the cluster could be defective. Any module on the bus could fail and bring down the bus too

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1 Answer

What does that code mean for the 2002 dodge durango "no bus"


The various computer and electronic modules on your vehicle communicate over a "communication bus". This network or bus, is what allows them to send electronic messages back and forth so that they can "talk" to each other. When you get the "no bus" indication is means that this communication network has failed and the modules can no longer "talk" to other. At the same time this occurs all kinds of weird electrical issues are likely occur and this is all due to the bus going down.

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p169 is "no ccd bus mesages recieved" that means the engine OR trans computer has not seen any communication (called a BUS) from the other modules on the communication bus if the instrument cluster is not working then it is the source of the code if the car wont shift then there is a communication issue with the trans computer if it wont start then there is a problem with the engine computer communication this is usually set by a bad instrument cluster

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2 Answers

1999 jeep cherokee


a bad crank or cam sensor can cause this as well as a bad computer...find a reputable dealer or garage to check it out for you

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