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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 .

May 05, 2016 | Cars & Trucks

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.

Jan 07, 2015 | Dodge Cars & Trucks

1 Answer

What is the most likely cause an error code u1900 in a 2008 ford explorer xlt 4wd


Do you know what a serial data network is ? With all the computers car makers put on thier cars these day's they need a communication network for them to talk ,share info. on etc. U codes are codes for the network . A module could be down ,could be a wiring problem . A shorted module or bus wire can bring down the whole vehicle. Could cause the vehicle not to start ,systems not to function . How did you pull this code ,with what scan tool or code reader ? Did it come from the PCM - engine computer ? Need a up scale professional scan tool to check all module's on the vehicle , need to pin point the module that is causing the problem .
U1900 CAN Communication Bus Fault - Receive Error 4WD Control Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error ABS Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error DSM REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error Instrument Cluster REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error Occupant Classification Sensor Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error Parking Aid Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error RCM REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error Retractable Running Board Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 .
016 CAN Communications

SECTION 418-00: Module Communications Network 2007 Explorer/Mountaineer/Explorer Sport Trac Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 08/02/2006 Communications Network Vehicle communication utilizes both medium and high speed controller area network (CAN) communications. CAN is used for many modules to communicate with each other on a common network. CAN in-vehicle networking, is a method for transferring data among distributed electronic modules via a serial data bus. Without serial networking, intermodule communication requires dedicated, point to point wiring resulting in bulky, expensive, complex, and difficult to install wiring harnesses. Applying a serial data network reduces the number of wires combining the signals on a single network. Information is sent to the individual control modules that control each function.
The vehicle has 2 module communication networks:
  • Medium speed (MS) CAN
  • High speed (HS) CAN
Both networks are connected to the data link connector (DLC). This makes diagnosis and testing of these systems easier by allowing one scan tool to be able to diagnose and control any module on both networks from one connector. The DLC can be found under the instrument panel between the steering column and the audio unit.
Network Topology

Module Name Network Type Termination Module Anti-lock brake system (ABS) module HS-CAN No Audio control module (ACM) MS-CAN No Digital versatile disc (DVD) player (if equipped) MS-CAN No Driver seat module (DSM) (if equipped) MS-CAN No Electronic automatic temperature control (EATC) module (if equipped) MS-CAN No Four wheel drive (4WD) control module (if equipped) HS-CAN No Instrument cluster (IC) (gateway module) HS-CAN
MS-CAN Yes
Yes Occupant classification sensor (OCS) module HS-CAN No Parking aid module (PAM) (if equipped) MS-CAN No Powertrain control module (PCM) HS-CAN Yes Power running board (PRB) module (if equipped) MS-CAN No Restraints control module (RCM) HS-CAN No Satellite digital audio radio system (SDARS) (if equipped) MS-CAN No Smart junction box (SJB) MS-CAN Yes Transmission control module (TCM) (if equipped) HS-CAN No
MS-CAN Network Operation
The MS-CAN network communicates using bussed messages. The MS-CAN has an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, this network allows sharing of information between all modules on the network.
The MS-CAN is a medium speed communication network used for the following modules:
  • SJB
  • Audio unit
  • Instrument cluster
  • DSM (if equipped)
  • DVD player (if equipped)
  • EATC module (if equipped)
  • Parking aid module (if equipped)
  • Satellite audio receiver (if equipped)
  • Power running board module (if equipped)
HS-CAN Network Operation
The HS-CAN network communicates using bussed messages. The HS-CAN network uses an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, this network allows sharing of information between all modules on the network.
The HS-CAN is a high speed communication network used for the following modules:
  • PCM
  • TCM (if equipped)
  • RCM
  • ABS module
  • Instrument cluster
  • Occupant classification sensor module
  • 4WD control module (if equipped)
Network Termination
The CAN network uses a network termination circuit to improve communication reliability. The network termination of the CAN bus takes place inside the termination modules by termination resistors. Termination modules are located at either end of the bus network. As network messages are broadcast in the form of voltage signals, the network voltage signals are stabilized by the termination resistors. Each termination module has a 120 ohm resistor across the positive and negative bus connection in the termination module. With 2 termination modules on each network, and the 120 ohm resistors located in a parallel circuit configuration, the total network impedance, or total resistance is 60 ohms.
Network termination improves bus message reliability by:
  • stabilizing bus voltage.
  • eliminating electrical interference.
Gateway Module
The instrument cluster is the gateway module, translating HS-CAN to MS-CAN and vice versa. This information allows a message to be distributed throughout both networks. The instrument cluster is the only module on this vehicle that has this ability.

Aug 30, 2017 | 2008 Ford Explorer 2WD

1 Answer

Won,t crank says no bus fuel gage wont work.there was a loose wire in steering column hooked this back up bus light went off cranked said p done .went to town yesterday shut off coming home cranked back,...


What color wire was loose ? VI/YL - Violet with yellow trace . A no bus message means the instrument cluster lost communication with the serial data network . Do you know what that is ? Gauge info. comes from other computers on the vehicle through the data bus. If a module (computer ) looes connection some how , faultly module , wiring problem etc... this message will show an more then likely a DTC - diagnostic trouble code will set in one of the modules on the vehicle . Don't know how much you know about this stuff , but you can not go to a auto part's store an have it check for code's . The tool they use doesn't check all the computers on the vehicle . The data bus on your vehicle is the PCI bus. 006 Chrysler PCI Communications
http://www.atraonline.com/gears/2010/2010-05/2010_5_60.pdf
Reading as much as you can about this an finding wiring diagrams to test the bus wiring plus having the modules checked for communication network code's is the way to find a fix . Most of the time it is a loose connection that causes this problem .

Nov 18, 2017 | 2001 Dodge Dakota

1 Answer

Chevy Uplander Codes


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.

Jun 14, 2012 | Cars & Trucks

1 Answer

EasyOBD II fault indication


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

Jan 17, 2012 | 2004 Citroen C2 VTS

1 Answer

Rover 75 vehicle starts but will not have acceleration


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.

Dec 22, 2011 | Cars & Trucks

1 Answer

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

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