Question about 1999 Jeep Cherokee

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Motor turns over does not start ,lcd read out says ( NO BUS)

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No bus means the computer is not talking it has lost commnication with other computers and sensors, the first thing to do is check all your fuses if they are all good then check the battery connection and also the postive cable from battery to fuse/ relay box in engine compartment, make sure they are tight and clean if all is good then you may have a bad computer but i would have a tech diagnose this before just replace the ecm.

Posted on Jul 10, 2010

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Posted on Jan 02, 2017

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No Bus Error


All the modules are connected together to communicate with each other via the PCI bus. It is possible that one of the modules is pulling the bus down.Since the vehicle won't start it could be any one of the modules. It will be a process of elimination to find the faulty one by disconnecting them one at a time. Here are a few, powertrain control module (the one you replaced) Instrument cluster, overhead console, anti-lock brakes, airbag. Since the cluster unplugged wont read anymore, just try to start the vehicle to see if that was the one. Otherwise see if the odometer message of "no bus" goes away after each one is unplugged.

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