U0122 Lost Communication With Vehicle Dynamic Control (VDC) Module
OBD-II DTC Datasheet
Lost Communication With Vehicle Dynamics Control (VDC) 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 Vehicle Dynamics Control (VDC) module 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 VDC module is responsible for preventing the tires from locking up when the ABS stops or losing traction when accelerating, not to mention preventing the vehicle from losing control when cornering on wet asphalt or during aggressive driving.
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.
symptoms
Symptoms of a U0122 engine code may include:
- Malfunction Indicator Lamp (MIL) illuminated
- ABS indicator is on
- TRAC indicator is on (depending on the manufacturer)
- ESP / ESC indicator is on (depending on the manufacturer)
reasons
Usually the reason for installing this code is:
- Loss of power or ground to engine / transmission control module ECM / PCM — most common
- 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
- 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 U0122, try accessing the VDC module. If you can access the codes from the VDC module, then the U0122 code is either intermittent or memory code. If the codes for the VDC module cannot be accessed, then the code U0122 set by other modules is active and the problem already exists.
The most common failure is loss of power or ground.
Check all fuses supplying the VDC module on this vehicle. Check all grounds for the VDC module. Locate ground anchorage 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 U0122 returns or you can contact the VDC module. If no code returns or connectivity 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 VDC module connector. Disconnect the negative battery cable before disconnecting the connector on the DC voltage 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 VDC module. You will need access to a digital volt ohmmeter (DVOM). Make sure you have power and ground at the VDC module. Access the wiring diagram and determine where the main power and ground supplies enter the VDC module. Connect the battery before proceeding with the VDC module still disconnected. Connect the red wire of your voltmeter to each B + (battery voltage) power source going into the VDC module 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 U0122, the only thing that can be done is to seek help from a trained automotive diagnostician as this will indicate a faulty VDC module. Most of these VDC modules must be programmed or calibrated for the vehicle in order to install correctly.
Related DTC discussions
- 2016 Lexus LX570 new ECU now U0122After trying to install the tracker, the car would not start. During the installation of the tracker, the ECU burned out. Ordered a new one, installed autostart, but shows U0122 and power steering, traction control, abs, yellow triangle lights. What should I do? This is on Lx2016 570 model year …
- I got error code u0122 and 27-15 for steering angle sensorPlease, help. I’m new here. I bought a car from someone and I noticed that something was wrong with it, so I take to the store a guy from the store told me that the abs sensor needs to be replaced, so I put the sensor in and installed it. the light is burning away. but when I test it and my speed is over 10 mph, the traction light comes on …
- DTCs Range Rover U0073, U0102, U0122, U0132, U0155, U0159, U0184, U0401, U0416 B1B02, B1C57, B1D12, B1D13, B1D14,Hi. I need help explaining to me what each DTC is: U0073, U0102, U0122, U0132, U0155, U0159, U0184, U0401, U0416 B1b02, B1C57, B1D12, B1D13, B1D14 and how to fix it. My car Range Rover Sport 2005- 4.2 is supercharged, I have a new battery ready, MAF, air filter, engine oil….
- 2013 Lexus lx570 pcs lamp U0122 U1101the vehicle is on, I have checked the DTCs: U0122 Lost Communication With Vehicle Dynamics Control Module and U1101 Lost communication with the remote control ECU. CURRENTLY I DO NOT HAVE A CORRECT CHECK …
- 2007 Hyundai Santa Fe U0001 & U0122 Lost Communication With Vehicle Dynamics Control (VDC) ModuleGood day, everyone. Need help with Hyundai Santa Fe 2007. Problem with the car: 1) At idle, the ABS light flickers 2) When driving and pressing the brake, the car starts to move. Sometimes the car jerks, the ABS flickers, and the car is unable to accelerate when trying to increase speed. …
- 2006 Range Rover Sport HSE Transmission Problems U2023 U0122Hi, I have a 2006 Range Rover sport with a transmission problem. The car does not have good torque when driving in first gear. That is, you turn on the gear selector, but it starts up very slowly. However, when reversing, it moves at a good speed. Again, he doesn’t make it to the last gear despite h …
Need more help with code u0122?
If you still need help with DTC U0122, 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.
U0122 Lost Communication With Vehicle Dynamic Control (VDC) Module
OBD-II DTC Datasheet
Lost Communication With Vehicle Dynamics Control (VDC) 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 Vehicle Dynamics Control (VDC) module 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 VDC module is responsible for preventing the tires from locking up when the ABS stops or losing traction when accelerating, not to mention preventing the vehicle from losing control when cornering on wet asphalt or during aggressive driving.
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.
symptoms
Symptoms of a U0122 engine code may include:
- Malfunction Indicator Lamp (MIL) illuminated
- ABS indicator is on
- TRAC indicator is on (depending on the manufacturer)
- ESP / ESC indicator is on (depending on the manufacturer)
reasons
Usually the reason for installing this code is:
- Loss of power or ground to engine / transmission control module ECM / PCM — most common
- 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
- 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 U0122, try accessing the VDC module. If you can access the codes from the VDC module, then the U0122 code is either intermittent or memory code. If the codes for the VDC module cannot be accessed, then the code U0122 set by other modules is active and the problem already exists.
The most common failure is loss of power or ground.
Check all fuses supplying the VDC module on this vehicle. Check all grounds for the VDC module. Locate ground anchorage 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 U0122 returns or you can contact the VDC module. If no code returns or connectivity 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 VDC module connector. Disconnect the negative battery cable before disconnecting the connector on the DC voltage 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 VDC module. You will need access to a digital volt ohmmeter (DVOM). Make sure you have power and ground at the VDC module. Access the wiring diagram and determine where the main power and ground supplies enter the VDC module. Connect the battery before proceeding with the VDC module still disconnected. Connect the red wire of your voltmeter to each B + (battery voltage) power source going into the VDC module 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 U0122, the only thing that can be done is to seek help from a trained automotive diagnostician as this will indicate a faulty VDC module. Most of these VDC modules must be programmed or calibrated for the vehicle in order to install correctly.
Related DTC discussions
- 2016 Lexus LX570 new ECU now U0122After trying to install the tracker, the car would not start. During the installation of the tracker, the ECU burned out. Ordered a new one, installed autostart, but shows U0122 and power steering, traction control, abs, yellow triangle lights. What should I do? This is on Lx2016 570 model year …
- I got error code u0122 and 27-15 for steering angle sensorPlease, help. I’m new here. I bought a car from someone and I noticed that something was wrong with it, so I take to the store a guy from the store told me that the abs sensor needs to be replaced, so I put the sensor in and installed it. the light is burning away. but when I test it and my speed is over 10 mph, the traction light comes on …
- DTCs Range Rover U0073, U0102, U0122, U0132, U0155, U0159, U0184, U0401, U0416 B1B02, B1C57, B1D12, B1D13, B1D14,Hi. I need help explaining to me what each DTC is: U0073, U0102, U0122, U0132, U0155, U0159, U0184, U0401, U0416 B1b02, B1C57, B1D12, B1D13, B1D14 and how to fix it. My car Range Rover Sport 2005- 4.2 is supercharged, I have a new battery ready, MAF, air filter, engine oil….
- 2013 Lexus lx570 pcs lamp U0122 U1101the vehicle is on, I have checked the DTCs: U0122 Lost Communication With Vehicle Dynamics Control Module and U1101 Lost communication with the remote control ECU. CURRENTLY I DO NOT HAVE A CORRECT CHECK …
- 2007 Hyundai Santa Fe U0001 & U0122 Lost Communication With Vehicle Dynamics Control (VDC) ModuleGood day, everyone. Need help with Hyundai Santa Fe 2007. Problem with the car: 1) At idle, the ABS light flickers 2) When driving and pressing the brake, the car starts to move. Sometimes the car jerks, the ABS flickers, and the car is unable to accelerate when trying to increase speed. …
- 2006 Range Rover Sport HSE Transmission Problems U2023 U0122Hi, I have a 2006 Range Rover sport with a transmission problem. The car does not have good torque when driving in first gear. That is, you turn on the gear selector, but it starts up very slowly. However, when reversing, it moves at a good speed. Again, he doesn’t make it to the last gear despite h …
Need more help with code u0122?
If you still need help with DTC U0122, 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.
В один из прекрасных тёплых зимних дней, когда дороги покрыты кашей приправленной реагентом, моя супруга пожаловалась на отвалившуюся abs и vsa. По возвращению машины мне, я сел за руль и о чудо! Ни ошибок, ни проблем не обнаружил (эффект присутствия мастера). Спустя три дня косяк проявился вновь и теперь уже почти не пропадал. Пора покопаться в гараже…
Помыв авто полез читать ошибки, u0122 свидетельствовала о потери связи с блоком abs/vsa. Найдя мануал (xonda-civic.ru/R00/HTML/3…3AK721000U0122FART00.HTML) и вооружившись мультиметром полез прозванивать 37 pin разъём блока abs.
Полный размер
37p разъём из мануала.
Все оказалось в норме кроме чуть-чуть завышенного сопротивления между 1 и 15 клеммой разъёма (~85-100 Ом вместо 65). Пока лазил под капотом ковыряя все места где может быть косяк и снимая ЭБУ стало понятно, что с линией canl, соединяющей мозги с блоком abs, не все в порядке. Её сопротивление плавало от 4 до 50 Ом, прозванивал сняв ЭБУ (ecm/pcm). После долгих поисков нашёл стыковочный разъём под правой аркой который больше похож на не используемую «фишку».
Полный размер
Клемма соединения can шины расположена в правой арке 🤬
При осмотре проводов разъёма было обнаружено нарушение изоляции одного из них, и как следствие, отгнивание. После переобжатия все работает как надо.
Цена вопроса: 3 ₽
Пробег: 278 000 км
Описание U0122 ошибки автомобиля Mercedes. В нашем справочнике имеется следующая информация:
На русском языке:
Шина данных, блок управления системой курсовой устойчивости — нет связи
На английском языке:
Lost Communication With Vehicle Dynamics Control Module
Выберите модель для возможности более детального просмотра информации по этой ошибке:
Найти причину >>>
Принимая во внимание тот факт, что OBD2 ошибки работы электронных систем автомобиля не всегда на прямую указывают на неработающий элемент, а чаще дают всего лишь общую информацию о неисправности, мы пришли к следующему выводу:
В разных марках и моделях автомобилей одна и также ошибка может возникать как следствие неисправности абсолютно разных элементов.
Стало понятно, что просто необходим ресурс в котором можно найти не только общую информацию об OBD2 ошибке, а практические данные по конкретному автомобилю.
Опыт автоэлектриков показал, что если рассматривать определенную марка-модель автомобиля, то в подавляющем большинстве случаев причина возникновения какой либо ошибки одна и также.
Мы создаем, не без вашей помощи, справочник причинно-следственной связи возникновения той или иной OBD2 ошибки у конкретного автомобиля (марка и модель). Если на Ваш автомобиль не найдено описание (причинно-следственной связи) ошибки, то не стесняйтесь задавайте вопрос.
Если у вас есть опыт в устранении той или иной ошибки — делитесь опытом с другими пользователями. Так мы сможем сформировать полезный ресурс. По капле от каждого и всем будет полезно.
Возможно будет интересно:
Если ошибка указывает на неверные параметры (высокие или низкие значения) какого нибудь из датчиков или анализаторов, то вероятней всего этот элемент исправен, а проблему надо искать так сказать «выше по течению», в элементах работу которых анализирует датчик или зонд.
Если ошибка указывает на постоянно открытый или закрытый клапан, то тут надо подойти к решению вопроса с умом, а не менять бездумно этот элемент. Причин может быть несколько: клапан засорен, клапан заклинил, на клапан приходит неверный сигнал от других неисправных узлов.
Автомобили с каждым днем становятся все более сложными, но и более диагностируемыми. Наш форум создан для всех, от простых автолюбителей до профессиональных автоэлектриков.
Описание ошибки U0122
На автомобилях с электронным управлением устанавливаются несколько блоков управления. Эти блоки осуществляют все операции управления на основании данных, получаемых от различных датчиков. Поскольку данные датчиков требуются разным блокам, для управления силовой передачей (БУТ, ЭБУД, комбинация приборов, ESP, 4WD, SAS, EPS) используется скоростной и помехоустойчивый интерфейс CAN. Шина CAN состоит из линии CAN LOW, линии CAN HIGH и двух 120 Ом резисторов в цепи. Если ЭБУ 4WD не получает сигналы от системы TCS, он устанавливает код неисправности U0122.
Возможная причина ошибки U0122
Плохой контакт
Обрыв или КЗ в линии связи CAN
Неисправность системы TCS
Неисправность датчика частоты вращения колеса
Примеры работ по Киа Хендай:
Замена: антифриза, бензобака, бензонасоса, втулок и стоек стабилизатора, гидрокомпенсаторов, гофры и глушителя, датчиков, жидкости ГУР, компрессора кондиционера, масла, маслосъемных колпачков, насоса ГУР, подушки двигателя, подшипников, помпы, приводного ремня, прокладки ГБЦ и КК, пружин и амортизаторов, пыльника и ШРУСа, радиаторов двигателя, кондиционера и печки, рулевых тяг и наконечников, рычагов, сайлентблоков, сальников, свечей зажигания, стекла, сцепления, тормозных колодок и дисков, цепи и ремня ГРМ, шаровых, фильтров…
Замена и ремонт: генератора, двигателя, КПП, рулевой рейки, стартера,
А так же: заправка кондиционера, регулировка зазоров клапанов, шиномонтаж, сход-развал, ремонт электрооборудования, удаление катализатора, промывка — инжектора, радиаторов и форсунок…
Все эти и другие виды работ можно сделать в техцентрах АвтоМиг.