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No bus on 99 dakota slt 2wd 5.2l

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Old May 26, 2025 | 02:31 PM
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Default No bus on 99 dakota slt 2wd 5.2l

Im getting crank no start. Fuel pump works. asd works getting 5v supply to crank cam map and tps sensors. New crank and cam sensor are new. Don't know what it is...getting codes 920 921 and 999 on odometer only other thing I see is gas and battery gauge not moving
 
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Old May 26, 2025 | 03:09 PM
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Those are cluster codes, and essentially meaningless as far as your problem goes.

The message is telling you the cluster can't communicate with the PCM, that's where it gets all its info of what to display with the gauges. Pretty much anything on the 5 volt bus can take down the comm network. Usually its a bad/shorted O2 sensor. Keep in mind though, these problems can be fun to troubleshoot..... start by unplugging sensors one at a time, and see if the bus comes back.
 
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Old May 26, 2025 | 03:28 PM
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Originally Posted by HeyYou
Those are cluster codes, and essentially meaningless as far as your problem goes.

The message is telling you the cluster can't communicate with the PCM, that's where it gets all its info of what to display with the gauges. Pretty much anything on the 5 volt bus can take down the comm network. Usually its a bad/shorted O2 sensor. Keep in mind though, these problems can be fun to troubleshoot..... start by unplugging sensors one at a time, and see if the bus comes back.
okay I'll give the o2 sensor a try
edit: tried them still no bus
 

Last edited by Roofer92; May 26, 2025 at 03:45 PM.
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Old May 26, 2025 | 03:46 PM
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What other systems are on the 5v supply
 
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Old May 26, 2025 | 07:21 PM
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Every engine sensor. And some in the trans as well.
 
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Old May 26, 2025 | 07:49 PM
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Originally Posted by HeyYou
Every engine sensor. And some in the trans as well.
Lol damn I was afraid u would say that 🤣
 
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