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U0138 Lost Communication with All Terrain Control Module
This is a generic communication system diagnostic trouble code that applies to most vehicle makes and models. This code means that the All Terrain Control …
Source: www.obd-codes.com
Date Published: 1/13/2022
View: 2957
U0138 Lost Communication With Rover Control Module
This is a generic communication system diagnostic trouble code that applies to most makes and models of vehicles. This code means that the All …
Source: avtotachki.com
Date Published: 11/14/2021
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U0138 Code Lost Communication With All Terrain Control …
|U0138 code possible causes · Faulty All-Terrain Control Module · All-Terrain Control Module harness is open or shorted · All-Terrain Control Module circuit poor …
Source: www.autocodes.com
Date Published: 6/3/2022
View: 1319
U0138 Lost Communication With All Terrain Control Module
In addition to receiving inputs from switches and commanding relay operation, the BCM can also communicate with the ECM or PCM. For example, in some vehicles …
Source: easysiteaussie815.weebly.com
Date Published: 8/22/2021
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View topic – Lost communication with all terrain module…help?!
U0138-00 (2F) Lost communication with all terrain control module … 1971 Range Rover Hybr – Sold to a braver man than I
Source: www.disco3.co.uk
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U0138 FORD: Code Meaning, Causes, Symptoms, & Tech …
The Powertrain Control Module (PCM) continuously monitors the Controller Area Network (CAN) for messages from the All-Terrain Control Module (ATCM). This …
Source: www.engine-codes.com
Date Published: 5/24/2022
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Freelander 2 (LR2) – Diagnostic Code U0138 and others…
LandyZone is the biggest Land Rover forum on the net. … U0138-00 lost comms with all terrain control module
Source: www.landyzone.co.uk
Date Published: 9/1/2021
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U0138 JEEP Lost Communication With All Terrain Control …
U0138 JEEP Lost Communication With All Terrain Control Module … KTM, Karma, Kia, Kleemann, Koenigsegg, LCC, Lada, Lamborghini, Lancia, Land Rover, Larte, …
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Date Published: 2/6/2021
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주제에 대한 기사 평가 u0138 land rover
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- Date Published: 2021. 5. 3.
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U0138 Lost Communication with All Terrain Control Module
U0138 Lost Communication with All Terrain Control Module
OBD-II Trouble Code Technical Description
Randy Worner
ASE Certified Master Technician Article byASE Certified Master Technician
Lost Communication with All Terrain Control Module
What does that mean?
This is a generic communication system diagnostic trouble code that applies to most vehicle makes and models.
This code means that the All Terrain Control Module (ATCM) and other control modules on the vehicle are not talking to each other. The circuit most often used to communicate with is known as Controller Area Network bus communications, or simply put, CAN bus.
Without this CAN bus, control modules cannot exchange information, and your scan tool may not be able to get information from the vehicle, depending on which circuit is affected.
The ATCM receives input from a variety of sensors, some hardwired directly to it, some are sent over the bus communications system. These inputs allow the module to control both the height of the vehicle and the drive line application, possibly whether it is a two-wheel drive or four-wheel drive application. It also has the ability to change the gear ratio applied to the drive axles and the amount of torque applied to the drive line.
Troubleshooting steps may vary depending upon manufacturer, type of communications system, number of wires and wire colors in the communication system.
Severity & Symptoms
Severity in this case depends upon the system. Because this suspension/drivetrain control system provides safety during hard steering and braking maneuvers, safety is a concern when diagnosing these systems. Also, safety is a concern during servicing of these systems as well. ALWAYS consult service information prior to disassembly/diagnosing these systems.
Symptoms of a U0138 engine code may include:
Red Brake Warning Light On
Amber Antilock Light On
Traction Control Light On or Flashing, depending on system
Check Suspension Light On, depending on system
Causes
Typically the causes for this code to set are:
Open in the CAN bus + circuit
Open in the CAN bus – circuit
Short to power in either CAN bus circuit
Short to ground in either CAN bus circuit
Open power or ground to ATCM module – most common
Rarely – faulty control module
Diagnostic and Repair Procedures
A good starting point is always to check for technical service bulletins (TSB) for your particular vehicle. Your issue may be a known issue with a known fix put out by the manufacturer and can save you time and money during diagnosis.
If your scan tool can access fault codes and the only one you retrieve from other modules is the U0138, try to access the all terrain control module. If you can access codes from the ATCM module, then the U0138 code is either intermittent or a memory code. If unable to access codes for the ATCM module, then the U0138 code that the other modules are setting is active, and the problem is there now.
The most common failure is loss of power or ground to the ATCM module.
Check all fuses that power up the ATCM module on this vehicle. Check all grounds for the ATCM. Locate where the ground attaching points are on the vehicle and make sure that these connections are clean and tight. If you have to, take them off, get a small wire bristle brush and baking soda/water solution and clean each one, both the connector and where it connects.
If any repairs were made, clear the diagnostic trouble codes from memory, and see if the U0138 code returns or if you are able to communicate with the ATCM module. If the code does not return or communication is re-established, then the fuses/connections were most likely your problem.
If the code returns, locate the CAN C bus communication connections on your particular vehicle, most importantly the ATCM module connector. Disconnect the negative battery cable before unplugging the connector at the ATCM control module. Once located, visually inspect the connectors and wiring. Look for scraping, rubbing, bare wires, burn spots or melted plastic. Pull the connectors apart and carefully inspect the terminals (the metal parts) inside the connectors. See if they look burned or have a green tint indicating corrosion. Use electrical contact cleaner and a plastic bristle brush if cleaning of the terminals is needed. Let dry and apply electrical grease where the terminals contact.
Before connecting the connectors back to the ATCM module, make these few voltage checks. You will need to have access to a digital volt-ohmmeter (DVOM). Verify that you have power and ground at the ATCM module. Gain access to a wiring diagram and determine where the main powers and grounds come into the ATCM module. Reconnect the battery before continuing, with the ATCM module still disconnected. Connect the red lead of your voltmeter to each B+ (battery voltage) supply coming into the ATCM module connector and the black lead of your voltmeter to a good ground (if not sure, battery negative always works). You see a reading of battery voltage. Verify that you have good grounds as well. Hook the red lead of your voltmeter to battery positive (B+) and the black lead to each ground circuit. Once again you should see battery voltage at each connection. If not, repair the power or ground circuit problem.
Next, check the two communication circuits. Locate the CAN C+ (or HSCAN + circuit) and CAN C- (or HSCAN – circuit). With the black lead of your voltmeter connected to a good ground, connect the red lead to CAN C+. With the Key On, Engine Off, you should see about 2.6 volts and fluctuating slightly. Next, connect the red voltmeter lead to the CAN C- circuit. You should see approximately 2.4 volts and fluctuating slightly. Other manufacturers show CAN C- at approximately .5 volts and fluctuating Key On Engine Off. Check the specifications for your manufacturer.
If all tests have passed and communication is still not possible, or you were unable to clear the U0138 fault code, the only thing left that can be done is to seek assistance from a trained automotive diagnostician, as this would indicate a failed ATCM module. Most of these ATCM modules must be programmed, or calibrated to the vehicle in order to be installed correctly.
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U0138 Lost Communication With ATV Control Module
U0138 Lost Communication With Rover Control Module
OBD-II DTC Datasheet
Lost Communication With All Terrain Control Module
What does this mean?
This is a generic communication system diagnostic trouble code that applies to most makes and models of vehicles.
This code means that the All Terrain Control Module (ATCM) and other control modules on the vehicle are not communicating with each other. The circuitry most commonly used for communication is known as Controller Area Bus communication, or simply the CAN bus.
Without this CAN bus, control modules cannot communicate and your scan tool may not receive information from the vehicle, depending on which circuit is involved.
The ATCM receives input data from various sensors, some of which are directly connected to it, and some are transmitted over a bus communication system. These inputs allow the module to control both the vehicle height and the powertrain application, possibly whether it is a two or four wheel drive application. It can also change the gear ratio applied to the drive axles and the amount of torque applied to the transmission.
Troubleshooting steps may vary depending on the manufacturer, the type of communication system, the number of wires, and the colors of the wires in the communication system.
Severity and symptoms
The severity in this case depends on the system. Because this suspension / transmission control system provides safety during tough steering and braking maneuvers, safety is a concern when diagnosing these systems. In addition, safety is important when servicing these systems. ALWAYS refer to the service information before disassembling / diagnosing these systems.
Symptoms of a U0138 engine code may include:
Red brake warning light is on
Amber anti-lock indicator included
The traction control indicator light is on or flashing, depending on the system
Check if the suspension light is on, depending on the system.
reasons
Usually the reason for installing this code is:
Open in CAN + bus circuit
Open in the CAN bus – electrical circuit
Short circuit to power in any CAN bus circuit
Short to ground in any CAN bus circuit
A power or ground interruption to the ATCM is the most common
Rarely – faulty control module
Diagnostic and repair procedures
A good starting point is always to check the Technical Service Bulletins (TSB) for your particular vehicle. Your problem may be a known issue with a known manufacturer-released fix and could save you time and money while troubleshooting.
If your scan tool can access DTCs and the only code you retrieve from other modules is U0138, try accessing the ATV control module. If you can access the codes from the ATCM, then the U0138 code is either intermittent or memory code. If the codes for the ATCM cannot be accessed, then the code U0138 set by other modules is active and the problem already exists.
The most common failure is loss of power or ground to the ATCM.
Check all fuses supplying the ATCM on this vehicle. Check all grounds for the ATCM. Locate grounding attachment points on the vehicle and make sure these connections are clean and secure. If necessary, remove them, take a small wire bristle brush and baking soda / water solution and clean each one, both the connector and the place where it connects.
If any repairs have been made, clear the DTCs from memory and see if U0138 returns or you can contact the ATCM. If no code is returned or communication is restored, the problem is most likely a fuse / connection issue.
If the code returns, look for the CAN C bus connections on your specific vehicle, especially the ATCM connector. Disconnect the negative battery cable before disconnecting the connector on the ATCM control module. Once detected, visually inspect the connectors and wiring. Look for scratches, scuffs, exposed wires, burn marks, or molten plastic. Disconnect the connectors and carefully inspect the terminals (metal parts) inside the connectors. See if they look burnt or have a green tint indicating corrosion. If you need to clean the terminals, use an electrical contact cleaner and a plastic bristle brush. Allow to dry and apply electrical grease where the terminals touch.
Perform these few voltage checks before plugging the connectors back into the ATCM. You will need access to a digital volt ohm meter (DVOM). Make sure the ATCM has power and ground. Access the wiring diagram and determine where the primary power and ground supplies go into the ATCM. Connect the battery before proceeding with the ATCM disconnected. Connect the red wire of your voltmeter to each B + (battery voltage) power supply going into the ATCM connector, and the black wire of your voltmeter to a good ground (if unsure, the negative pole of the battery always works). You can see the battery voltage reading. Make sure you have a good reason. Connect the red wire from the voltmeter to battery positive (B +) and the black wire to each ground. Once again, you should see the battery voltage every time you plug it in. If not, troubleshoot the power or ground circuit.
Then check the two communication circuits. Find CAN C + (or HSCAN +) and CAN C- (or HSCAN – chain) circuit. After connecting the black wire of the voltmeter to a reliable ground, connect the red wire to CAN C +. With the key on and the engine off, you should see about 2.6 volts with slight fluctuations. Then connect the red wire of the voltmeter to the CAN C- circuit. You should see about 2.4 volts with slight fluctuations. Other manufacturers show CAN C- at about 5V and a flapping key when the engine is off. Check out your manufacturer’s specifications.
If all tests pass and communication is still not possible, or you were unable to reset DTC U0138, the only thing that can be done is to seek help from a trained automotive diagnostician, as this will indicate a failed ATCM module. Most of these ATCMs must be programmed or calibrated for the vehicle in order to be installed correctly.
Related DTC discussions
There are currently no related topics in our forums. Post a new topic on the forum now.
Need more help with code u0138?
If you still need help with DTC U0138, post a question in the comments below this article.
NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.
U0138 Code Lost Communication With All Terrain Control Module
What does this mean? | U0138 code possible causes Faulty All-Terrain Control Module
All-Terrain Control Module harness is open or shorted
All-Terrain Control Module circuit poor electrical connection
| How do I fix code U0138 code? Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Safety Recalls? → Check here Does your car have
| Cost of diagnosing U0138 code Labor: 1.0 The cost of diagnosing the U0138 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
| What are U0138 code possible symptoms? Engine Light ON (or Service Engine Soon Warning Light)
| U0138 code description A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the All-Terrain Control Module has not been received. U0138 Code – Lost Communication With All Terrain Control Module
| Need more information with the U0138 code? Need more information on how to fix the U0138 code? Get Access to Factory Service Manuals
| Information for specific makes U0138 FORD Lost Communication With All Terrain Control Module
U0138 LINCOLN Lost Communication With All Terrain Control Module
U0138 MERCURY Lost Communication With All Terrain Control Module
| Need help with a U0138 code? Get the u0138 code diagnosed by a professional: Find a repair shop in your area
U0138 FORD: Code Meaning, Causes, Symptoms, & Tech Notes
What does this mean? | What are the Possible Causes of the U0138 FORD Code? Faulty All-Terrain Control Module
All-Terrain Control Module harness is open or shorted
All-Terrain Control Module circuit poor electrical connection
| How to Fix the U0138 FORD Code? Start by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
| What is the cost to diagnose the U0138 FORD code? Labor: 1.0 The cost to diagnose the U0138 FORD code is 1.0 hour of labor. The auto repair’s diagnosis time and labor rates vary by location, vehicle’s make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
Safety Recalls? → Check here Does your car have
| What are U0138 FORD code possible symptoms? Engine Light ON (or Service Engine Soon Warning Light)
| What Does the U0138 FORD Code Mean? The Powertrain Control Module (PCM) continuously monitors the Controller Area Network (CAN) for messages from the All-Terrain Control Module (ATCM). This Diagnostic Trouble Code (DTC) sets when the PCM does not receive the ATCM message within the defined amount of time. Lost Communication With All Terrain Control Module
| Need more information with the U0138 FORD code? Need more information on how to fix the U0138 FORD code?
Get Access to Factory Service Manuals
Freelander 2 (LR2) – Diagnostic Code U0138 and others…
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U0138 JEEP Lost Communication With All Terrain Control Module – CarObdCode.Com
OBD Code:
System:
Subsystem: U0138 JEEP – (ASE)
Network Communication
Fuel and Air Metering Trouble Code Description: Lost Communication With All Terrain Control Module
Location:
Analysis:
Possible Causes:
Tech description:
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