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Fault code "no bus" Vehicle

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The "NO BUS" points to PCM communication failure. Disconnect the battery negative then unplug and plug back in the PCM connectors. Reconnect battery and run engine. Try pulling DTCs with a code scanner. If the PCM won't communicate, it's probably fried.

Posted on Mar 20, 2011

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Try looking for a blowed 10amp fuse behind the door on the driverside. Mine did this today and I was able to replace the fuse and now the code is gone. Worked for me

Posted on Apr 29, 2013

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Posted on Jan 02, 2017

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2005 volvo xc90 will not stay running, it is giving a code of U0073 generic control module communication bus"a" off. .we have put in new crank sensor. the maf sensor is not the problem


Do you know what a serial data communication network is ? All the control modules on your vehicle share info on it . It stead of hard wiring all the componets on the vehicle they use control modules and a data network . U codes are problem codes assoicated with these networks . U0073 generic control module communication bus"a"OFF Has nothing to do with engine sensors ! Condition
The control modules transmit and receive information via a standardized serial communication method - CAN (Control Area Network).
The diagnostic trouble code (DTC) is stored if the control module detects that:
  • The control module does not have contact with the controller area network (CAN).
  • Incorrect value runs longer than 10 seconds.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
  • Starting the control module's CAN communication.
Note!The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met. In the event of system communication problems, it is not possible to communicate with the control module. Therefore it will only be possible to read off the fault if it is intermittent. Substitute value
  • None.
Possible source
  • Open-circuit in terminals.
  • Damaged Parking Assistance Module (PAM).
Fault symptom[s]
  • Parking Assistance System, malfunction
  • Information lamp is on
  • Message in information display

A shorted module will cause the data bus to short and cause no start condition . You best bet , take it to a qualified repair shop . How to Diagnose Controller Area Network CAN

Jan 06, 2017 | 2005 Volvo XC90

1 Answer

It won't crank anymore. The starter was replaced but still nothing. It says to engage the parking brake but when engaged the screen says parking brake fault. What needs to happen to make it crank?


You don't give enough info to give you any direction . would need to know make , model an year vehicle for starters ! What screen says parking brake fault ? There is probably a fault code stored in one of the computers on the vehicle . If this is a new vehicle the electronics are unbelievable , all modules on vehicles are on a serial data communication bus. An I'm sure you don't have the tools or knowledge to diagnose these type problems. Everything is interconnected. Check out this on C.A.N. data bus network . How to Diagnose Controller Area Network CAN Not to be little you or anyone else on here , but if you don't know it's best that you take your vehicle to a qualified repair shop .

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2 Answers

It blinks nobus on my milage when I try to start it what does that mean


That message means that there is no communication on your "Bus" line which is the Serial Data Bus ckt of which all of the computers in your vehicle communicate on. I recommend taking the vehicle to the dealer. They have the most recent information on your vehicle and a tech there will be able to diagnose and repair it the quickest and most effectivly.

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You need to have the dealer scan the vehicle anti theft system for fault codes, there is nothing you can do for this fault at home.

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Hi, If you are trying scan a VW group car, you need a VAGCOM software and interface VAGCOM, with easyobd2 is no compatible protocol, best regards

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Hi, Check fuel filter and replace. Check and replace sparkplugs. Check ignition components. coil, wires, distributor for cracks. and then check for codes. Good luck.

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2000 jeep grand cherokee laredo showing code p1686, p1687, p1688, geuges go down, all warning lights come on, with time, the geuges comes on, and the warning lights come off, all but the security key...


Diagnostic Fault Code (DTC) P1686 has a generic description of "No SKIM Bus Nessage Received".
Diagnostic Fault Code (DTC) P1687 has a generic description of "No Instrument Cluster Bus Message"

P1688 is either not a valid code for your vehicle, or the manufacturer failed to provide specific information for it.
Basically, what is going on here is that you have a problem in your computer network communication bus. Or to put it more simply, the "phone line" is down. Your computers in your vehicle are having problems talking to each other.

"SKIM" stands for Sentury Key Imobilizer Module (AKA security module). The Instrument cluster and the SKIM are not communicating with the Powertrain Control Module (PCM) for sure, and possibly also not communicating with the Body Control Module (BCM). There may also be problems with other modules that share the same data lines.
This MUST be diagnosed with a scan tool that can access the entire computer network. You must find out which modules can communicate with the scanner and which ones cannot. This is necessary to determine the possible location of the fault.

Nov 07, 2011 | 1999 Jeep Cherokee

1 Answer

Code shows "NO BUS". And


Most often this error message and the stalling is caused by a faulty crank sensor on the Durango. It creates a short in the 5 wire harness. I would suggest replacing this before you go any further. It is mounted on the right side of the engine block, above the starter on the 4.7 litre engine.
Good luck, i hope this helps.

Aug 08, 2011 | 2002 Dodge Durango

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