Category: U0121 jeep

U0121 jeep

I have a Jeep Liberty. Check engine light is on as well as Brake light, ABS light, seat belt light, air bag light and speedometer is not working. Went to Autozone and they hooked it up and got the following codes U, U and U I have looked these up but not sure where I should start to fix the problem. My husband and I are both disabled and don't have money to take it to the local dealership.

Can you please tell me what to look for first?

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Lost communication has alot to do with loss power. When the airbag light is on, this means the airbag system may or may not deploy if ever involved in a accident where airbag system is needed. Play Now. Questions Hot! Unanswered Tags Users Ask a Question. Ask a Question. Jeep Liberty codes U,U,U Vehicle: Jeep Liberty. Please log in or register to add a comment. Please log in or register to answer this question. U Lost wheel distance message U Lost vehicle speed message U Lost communication with anti-lock brake module Lost communication has alot to do with loss power.

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Related questions. U Chevrolet - just had a transmission rebuild, could anything be related to this? U Chevrolet - Impala that does not have abs. U code on Dodge Ram. Need A Repair Shop? How much do you know about cars? Take the AutoCodes.

Send feedback Jobs. Powered by Question2Answer.Post a Comment. When monitored U Code With the ignition on. Battery voltage between 10 and 16 volts. Bus messages not received from the ABS for approximately two to five seconds. Possible causes:. CAN C Bus - circuit shorted to ground. ABS power and ground. Antilock Brake System. Module that set this DTC. Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

Jeep U0121 Lost Communication With Anti-Lock Brake System (ABS) Control Module

With the scan tool, read active DTC. Turn the ignition on, with the scan tool, view all modules. Verify the ABS is active on the Bus. No, go to step 5. Step 5. Is this DTC still active? Perform the appropriate verification test for the module being replaced.

u0121 jeep

If there is no verification test for the associated module perform the Body Verification Test. No, go to step 6. Step 6. Does this DTC become active? Yes, go to step 7.Play Now. 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. The auto repair labor rates vary widely across the country, and even within the same city.

How much do you know about cars? Take the AutoCodes.

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The Controller Area Network CAN data bus allows all electronic modules connected to the bus to share information with each other. All modules transmit and receive messages over one of these buses. Data exchange between the modules is achieved by serial transmission of encoded data messages a form of transmission in which data bits are sent sequentially, one at a time, over a single line.

Each module can both send and receive serial data simultaneously. Each data bit of a CAN Bus message is carried over the bus as a voltage differential between the two bus circuits which, when strung together, form a message. Each module uses arbitration to sort the message priority if two competing messages are attempting to be broadcast at the same time.

Corruption of a single bit within a message will corrupt the entire message.

u0121 jeep

If the message detected conflicts with the CRC the ECU receiving it will determine the message to be an error and consider that communication has not been possible. Diagnosis of this condition using a lab scope may reveal activity that appears to be Bus data messages even if no actual communication is possible. Communication problems that affect the whole bus, as a result of opens and terminal push outs are more likely to occur on data busses that operate at a high speed than a data bus that operates at a lower speed.

When an open circuit or terminal push out occurs one or more modules can become isolated from the remainder of the bus. The isolated module will attempt to communicate, but will not be able to receive messages or determine arbitration from other modules.

Each time the isolated module attempts to communicate it alters the bus voltage on the intact bus circuit. Without functioning arbitration the isolated module alters the bus voltage while other bus messages are being sent thereby corrupting the messages on the remainder of the bus. The CAN bus modules are connected in parallel to the two-wire bus using a twisted pair, where the wires are wrapped around each other to provide shielding from unwanted electromagnetic induction, thus preventing interference with the relatively low voltage signals being carried through them.

u0121 jeep

Get Access to Factory Service Manuals. Need more help? Get the U Jeep code diagnosed by a professional: Find a repair shop in your area. Why is the Engine Light ON? Repair Importance Level: 3.Play Now. Check the "Possible Causes" listed above.

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Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins. How much do you know about cars? Take the AutoCodes.

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The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. The Controller Area Network CAN data bus allows all electronic modules connected to the bus to share information with each other. All modules transmit and receive messages over one of these buses.

Data exchange between the modules is achieved by serial transmission of encoded data messages a form of transmission in which data bits are sent sequentially, one at a time, over a single line. Each module can both send and receive serial data simultaneously. Each data bit of a CAN Bus message is carried over the bus as a voltage differential between the two bus circuits which, when strung together, form a message.

Each module uses arbitration to sort the message priority if two competing messages are attempting to be broadcast at the same time. Corruption of a single bit within a message will corrupt the entire message. If the message detected conflicts with the CRC the ECU receiving it will determine the message to be an error and consider that communication has not been possible.

Diagnosis of this condition using a lab scope may reveal activity that appears to be Bus data messages even if no actual communication is possible. Communication problems that affect the whole bus, as a result of opens and terminal push outs are more likely to occur on data busses that operate at a high speed than a data bus that operates at a lower speed.

When an open circuit or terminal push out occurs one or more modules can become isolated from the remainder of the bus. The isolated module will attempt to communicate, but will not be able to receive messages or determine arbitration from other modules. Each time the isolated module attempts to communicate it alters the bus voltage on the intact bus circuit. Without functioning arbitration the isolated module alters the bus voltage while other bus messages are being sent thereby corrupting the messages on the remainder of the bus.

The CAN bus modules are connected in parallel to the two-wire bus using a twisted pair, where the wires are wrapped around each other to provide shielding from unwanted electromagnetic induction, thus preventing interference with the relatively low voltage signals being carried through them.

Get Access to Factory Service Manuals. Need more help? Get the U Chrysler code diagnosed by a professional: Find a repair shop in your area. Why is the Engine Light ON? Comments Help us improve AutoCodes. Leave a comment below or tell us if the information above help you fix the code.When your car's 'Jeep Compass U Check Engine' light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap.

But in many cases, it means at minimum that you'll be visiting the car dealer to locate the malfunction and get the light turned off.

SOLVED!!! ECU ECM No Communication FREE fix!!

So you should chech it on our car models. The crankshaft sensor signals the fuel injection computer or the ignition control when the cylinders are firing. This causes the ignition coil to provide a spark and the injector to inject fuel into each cylinder at the right time. If either sensor isn't working correctly, the car will run rough and the engine will be less efficient.

In later car models, the car's computer can usually keep the vehicle running, but the engine warning light on the dashboard goes on to warn the driver. Parts or components should not be replaced with reference to only a U DTC.

The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.

Code Search Please fill the "Code Box" to find engine fault code. Ways to read engine trouble codes. Ways to clear check engine light on car panel. Check Engine Light Dictionary Ways to clear check engine light on car panel. Main engine trouble code archive on Web. Copyright EngineTroubleCode.

U0121 CHRYSLER - Lost Communication With Anti-Lock Brake System Module

Check engine light comes on Engine stalling or misfiring Engine performance issues Car not starting. If one of these reasons for U code is occuring now you should check U repair processes.

Now don't ask yourself; What should you do with U code? The solution is here :. Operating information and comm U code.Jenna, United States The Golden Triangle of Scandinavia, August 2016 Irja was wonderful. Lise, United States Iceland Full Circle, August 2016 I booked this trip within 3 weeks of our arrival during the height of the summer season in Iceland. Mark, Canada Express Iceland, August 2016 Very well organized.

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