Jeep Code U1120 is an error code that is displayed when the Powertrain Control Module (PCM) fails to receive wheel speed and wheel distance CAN C bus messages from the Anti-lock Brake (ABS) module. This error code is commonly found in Jeep vehicles, hence Jeep Code U1120. The cause of this issue can vary, ranging from a CAN C BUS CIRCUIT being open or shorted to an ABS module or PCM malfunction. To address the issue properly, knowing the potential causes and solutions is important. To provide further information and help, related services bulletins are also available. The following table outlines the causes and solutions for Jeep Code U1120.
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Causes and Solutions for Jeep Code U1120
| Cause | Solution |
|---|---|
| CAN C BUS CIRCUIT OPEN OR SHORTED | Inspect the wiring and connectors of the CAN C BUS system for any signs of damage or corrosion. |
| ANTI-LOCK BRAKE SYSTEM (ABS) MODULE | Check the ABS module for any loose wiring or faulty components. |
| POWERTRAIN CONTROL MODULE (PCM) | Replace the PCM if it is malfunctioning. |
| Related Service Bulletins | Refer to S2208000085 for further information. |
CAN C BUS CIRCUIT OPEN OR SHORTED
Jeep Code U1120 is triggered when the CAN C BUS CIRCUIT is open or shorted. Various things, including faulty wiring, damaged components, or corrosion, can cause this. It is important to inspect the wiring and connectors of the CAN C BUS system for any signs of damage or corrosion. If there are any issues, they should be addressed immediately.
ANTI-LOCK BRAKE SYSTEM (ABS) MODULE
If the CAN C BUS CIRCUIT functions properly, the issue may be with the ABS module. It is important to check the ABS module for any loose wiring or faulty components. If the ABS module is malfunctioning, it can cause the Jeep Code U1120 to be triggered.
POWERTRAIN CONTROL MODULE (PCM)
The Powertrain Control Module (PCM) receives wheel speed and wheel distance CAN C bus messages from the Anti-lock Brake (ABS) module. If the PCM malfunctions, the Jeep Code U1120 will be triggered. In this case, the PCM should be replaced.
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Jeep Code U1120 may also be related to service bulletins regarding the CAN C BUS CIRCUIT, ABS module, and PCM. For further information, it is recommended to refer to Service Bulletin S2208000085.
Conclusion: Troubleshooting Jeep Code U1120
Various issues, including faulty wiring, damaged components, or an ABS module or PCM malfunction, can cause Jeep Code U1120. Inspecting the CAN C BUS CIRCUIT and related components is important to address the issue properly. Additionally, service bulletins can provide further information and help.
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