Question about 2005 Dodge Ram 1500

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Instrument panel guages quit. Getting 'No Bus' error in odometer.

Hi, I've recently encounted some issues with my 05 dodge ram truck. I'm not sure if this is instrument cluster or raido related or not, but I've found evidence online that it could be. The problem was while driving, I suddenly lost my instrument panel guages. They stopped working, all lighting came on and a 'No Bus' error was dislayed, although the truck still ran fine. Long story short, ive done some research, and the error means the instrument cluster is not receiving messages from all PCM modules or something like that. I've read that the problem could be b/c or a faulter instrument cluster and also because there is a white/violet striped wire connecting all vehicle modules including cluster, radio, amp, ABS controller, A/C controller, and more. A problem with this wire somewhere could cause the issue. I recently swapped out my stock headunit for an aftermarket panasonic and wired it up myself using a wiring diagram I found online. One of the wires is a white/violet wire. The diagram did not list its use, and without it everything seemed to work fine so I left it disconnected. Whats weird is that everything worked fine for a few months until this happened yesterday. Does this wire need to be connected to the headunit via ACC, or ground or something?? Or can I just leave it as it is (plastic cap over cut end). Ive not found any info anywhere that mentions what should be done with this wire when installing an aftermarket unit. Any help is apprecated. Thanks -Keith

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  • Dodge Master
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That wire needs to be hooked to the factory radio , part of the PCI bus - serial data communication network . I know on GM vehicles if the radio isn't hooked to the bus the vehicle will not start an run . Don't know if Dodge vehicles are that complex . http://www.dodgeintrepid.net/31-car-audio-video/58412-why-pci-bus-connection-radio.html http://www.carsondemand.com/IDLdocuments/Learning%20Guide/4450-t9r0k5io6vxazm80x5ire9zj4.pdf

You mite call a aftermarket installer an ask or the dodge dealer

Posted on Feb 28, 2017

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Have 1999 Dodge stratus all the gauges stopped working and odometer reads -no bus- a/c compressor stop working to, they all stopped at the same time.


I'd have to check voltage and ground for the instrument cluster. I noticed one of the fuses for your instrument cluster goes hot with the key on, same thing for ac compressor. I'd have to voltage feed to and from ignition switch for applicable fuse. Check the ignition switch wiring connector. I can't rule out ignition switch itself, at the moment.
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Ignition switch faults are common on some makes and models.
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Some instrument clusters may do a self test, don't know about yours?
Press and hold odometer reset button, turn key to run position release odometer reset button, watch the odometer. Your indicator lamps may turn on and off, the gages may cycle in small increments. The cluster will exit self test on its own.
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