How to Troubleshoot & Fix U1110 Jeep DTC Code? (Detailed Guide)

As a Jeep owner, it’s essential to know the various DTC or error codes your vehicle may display. One such error code that you may come across is the U1110 code. 

It indicates a communication failure between the powertrain control module (PCM) and the other control modules in the vehicle. 

In this article, we’ll provide you with a complete guide on how to troubleshoot and fix the U1110 Jeep code.

What Does the U1110 Jeep Code Mean?

The U1110 Jeep code is a generic powertrain code defined as Lost Vehicle Speed Message. It typically indicates a communication error between the vehicle’s PCM and other control modules. 

Your car’s Powertrain Control Module (PCM) is informed of the vehicle’s speed through an electrical signal received from the Controller Area Network (CAN) C bus in the ABS (Anti-Lock Brake Module). 

The PCM/ECM may not have successfully received data if DTC U1110 OBD2 is stored.

It’s important to note that the code doesn’t specify which module is at fault. Rather, it’s an indication of a communication failure.

Here’s a breakdown of U1110 code.

• U = Network and communication unit
• 1 = Generic manufacturer-specific code; applies to OBD-II-equipped vehicles
• 1 = Fuel and air metering
• 10 = Specific fault index; here, it indicates a lost communication message between the PCM and other control modules

U1110 Code: What Causes the Lost Vehicle Speed Message Error on Jeep?

Knowing the potential causes of the U1110 code is key for identifying and diagnosing your Jeep’s lost vehicle speed message issue. 

To get the right fix, it’s important to be aware of all possible causes. The most likely causes of the U1110 Jeep code include the following:

• Shorted or open CAN bus circuits
• A damaged or faulty ABS module 
• Faulty wiring harnesses or connectors
• Failed PCM

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How to Troubleshoot & Fix U1110 Jeep Code?

Fixing the U1110 code on your Jeep requires a systematic approach. Since the issue is related to the communication between control modules and doesn’t specify which control module is at fault, it’s important to go through a series of tests and checks. 

Below we outline the steps you can take to troubleshoot and repair this error code.

1. Check for TSBs (Technical Service Bulletins)

Before you start troubleshooting, it’s important to check if any existing TSBs are related to the U1110 code. 

The manufacturer may have shared helpful advice or specific remedy procedures related to your error code, so it’s worth checking them out first.

If any of them are related to communication on the bus system, or battery and ignition, these should be diagnosed first to avoid misdiagnosis. 

Be sure to diagnose the U0110 code after thoroughly investigating and ruling out all other basic codes.

2. Retrieve and Clear the Data

Once you’ve checked for TSBs, it’s time to retrieve and clear all the data stored in the control modules.

To do this, you’ll need an advanced scan tool or diagnostic computer and a technician who knows how to use it. 

If you see the U0110 code only from other modules, but your scan tool can access fault codes, try connecting to the DMC module. This code could be an intermittent or stored error if you can establish a connection. 

However, if communication with the GPCM module fails, it’s likely that the U0110 code is active and causing problems right now.

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3. Inspect for CAN Bus Circuit Shorts and Opens

Once the data has been retrieved and cleared, it’s time to inspect the CAN bus circuits for shorts and opens. Most failures occur due to power loss or ground loss. 

You can use a multimeter to measure the voltage levels across each circuit and ensure they’re within specification. And be sure to check all the fuses and grounds for the DMC module.

To ensure that these connections are clean and tight, remove them and use a small wire-bristle brush with a baking soda/water solution to thoroughly clean each one, both the connector and the point of connection.

Note: It’s essential to take proper safety precautions when working with these high-voltage systems. Failing to do so can be dangerous and cause serious damage to your vehicle or injuries to you. If unsure about any step of the process, get help from a technician.

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4. Test the Module and Check the Connectors

Next, you’ll need to test the module, ensuring that all connections are securely attached and free of damage. 

Look at the wiring to see any evidence of scraping or bare spots. Pay special attention to the terminals inside the connectors – these metal parts might show signs of burning or melted plastic.

They should not have a greenish tint. If necessary, clean them with an electrical contact cleaner and a plastic brush. Once that’s done, dry the terminals and apply dielectric silicone grease where they meet.

After all the connectors have been reattached and codes cleared, you can continue your testing.

5. Replace Any Failed Components

If the above steps don’t solve the U1110 code in your Jeep, then it’s likely that your car has one or more failed components, most likely the ABS or PCM.

However, apart from the visible signs of wear and tear or burn spots, it’s hard to determine if a component needs to be replaced.

This is because U1110 may occur due to an internal issue within these systems, and it doesn’t tell you which one. So it’s best to leave this work to the experts.

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Frequently Asked Questions

If you’ve still got questions about troubleshooting the error code U1110 in your Jeep, here are the answers to some of the most common queries that might help.

Conclusion

The U1110 code can be challenging to diagnose and fix in Jeeps, requiring specialized diagnostic tools to pinpoint the underlying issue.

While the above steps can give you a headstart in diagnosing, keep in mind that they cover just the basics. So don’t hesitate to seek professional assistance if necessary.

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