Jeep U0140 Code is a diagnostic trouble code that indicates a communication error between the body control module (BCM) and the powertrain control module (PCM). This means that the BCM is not receiving any messages from the PCM within 20 seconds of engine running and battery voltage being more than 10 volts. This code can pop up due to a variety of problems, ranging from a faulty communication link with the BCM to an open PCI Bus circuit and a failed PCM. Thankfully, there are a number of related service bulletins available to help diagnose and repair this issue.
Causes and Solutions for Jeep U0140 Code
| Cause | Solution |
| ————- |:————-:|
| Communication link with BCM has failed | Replace the BCM |
| PCI Bus circuit open | Check the wiring and connections |
| PCM has failed | Replace the PCM |
| Battery voltage is too low | Charge the battery |
Failed Communication Link With BCM
The most common cause of Jeep U0140 Code is a failed communication link between the body control module (BCM) and the powertrain control module (PCM). This means that the BCM is not receiving any messages from the PCM within 20 seconds of engine running and battery voltage being more than 10 volts. If this issue is left unchecked, it can cause the vehicle to run erratically or even shut down entirely. The best way to resolve this issue is to replace the BCM.
Open PCI Bus Circuit
Another potential cause of Jeep U0140 Code is an open PCI bus circuit. This is when the wiring or connections between the PCM and BCM are not working correctly. To fix this issue, the technician needs to examine the wiring and connections to ensure that they are all in working order. If any of the wiring or connections are faulty, they must be replaced.
Failed PCM
In some cases, the PCM may be the root cause of the Jeep U0140 Code. If the PCM has failed, it will not be able to communicate with the BCM, resulting in the code appearing. The only way to fix this issue is to replace the PCM.
Low Battery Voltage
Finally, one potential cause of Jeep U0140 Code is a low battery voltage. This is when the battery voltage is too low for the PCM and BCM to communicate properly. To fix this issue, the technician needs to charge the battery.
Conclusion
Jeep U0140 Code is an indication of a communication error between the body control module and the powertrain control module. This code can be caused by a variety of problems, such as a failed communication link with the BCM, an open PCI Bus circuit, a failed PCM, or a low battery voltage. Thankfully, there are a number of related service bulletins available to help diagnose and repair this issue. If you are experiencing this issue, it is important to have it looked at by a qualified professional as soon as possible. Jeep U0140 Code should not be ignored, as it can have serious repercussions if left unresolved.
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