How to Fix the U010C DTC Code on 6.7L Cummins (Pro Tips)

DTC codes help a mechanic discover the car’s problem efficiently and quickly. These codes indicate the specific issues with the car parts and circuits. Successfully troubleshooting the code means you’ve solved 50% of the problem. Let’s start with the meaning of the code U010C on 6.7L Cummins.

The DTC code U010C means there is a communication issue between the car’s turbocharger and other control modules. Opened CAN C+ circuits, lack of power, and the defective control module are responsible for this code.

The symptoms and remedies are covered in detail in this discourse. Knowing the signs beforehand will make it easier for you to discover and crack the code. If you are unfamiliar with the U010C code, always seek an expert’s advice.

How to Fix the U010C DTC Code on 6.7L Cummins

What Does the Code U010C Mean for 6.7L Cummins?

In Cummins 6.7, the U010C code implies communication problems between the turbocharger or supercharger control module A and other modules in the car. 

Let’s break the U010C code to find out more about this code.

  • U= Electrical network that keeps the electric parts running (in our case, the turbocharger or the supercharger control module A)
  • 0= A generic number according to SAE
  • 1= Air and fuel metering index
  • 0C = Specific fault index (the communication problem between the turbocharger and other modules in the car)

Lack of communication won’t be able to supply enough power to the engine. As a result, the car will operate slowly, affecting its performance.

How Serious Is Code U010C On 6.7L Cummins?

The DTC code U010C on Cummins 6.7 is not a serious case for the car’s engine. This is a communication system trouble code that occurs between the turbocharger and other modules of the vehicle.

This shows a power shortage in the car’s CAN circuit. Long-distance travel becomes a challenge with low engine power. The problem is not severe since the PCM has a backup plan in these scenarios.

Your vehicle won’t operate at its best with a faulty communication system. If the circuits are open and unclean, the situation worsens.

 What Causes U010C Code On 6.7L Cummins?

The U010C code on a Cummins 6.7 has various causes. Most of these causes are visible to the naked eye. These codes appear to be different, but a skilled technician can quickly identify them. Here are some Common reasons the code appear on Cummins

  • An illuminated engine light or the service engine light.
  • An unsecured CAN bus + or circuit.
  • Power shortage.
  • A defective control module.

How To Fix Code U010C On 6.7L Cummins?

You can fix the U010C code yourself if you’ve experience in this field or you’re a certified mechanic. It’s always best to take the car to a mechanic’s shop. 

Here’s a guide on how an accredited mechanic fixes the code on a Cummins 6.7:

Code Confirming

A mechanic will run a diagnosis to confirm the U010C DTC code. They’ll proceed further once scanning is completed.

Accessing TSCM-A

After confirming the U010C code, seek to enter the TSCM-A. It’s a memory code if you can directly access it from the TSCM-A. 

The problem is in other modules if you can’t access them from the TSCM-A. Clear all the codes if any repairs were done before.


Disconnect the battery before detaching the TSCM-A. Check the wiring and connector pins. Look for scrapings, burned wires, and melted plastics. 

Use an electric cleaner to clean the terminals inside the connectors. After cleaning, the mechanic applies grease to prevent corrosion.

Voltage Check

Mechanics generally use a digital voltage meter (DVOM) before joining the connectors. They can check the reading voltage through the wiring diagram. 

The TSCM-a stays disconnected, but the battery stays connected at this stage. There’ll be no reading if there’s an issue with power or the ground circuit.

Inspecting Communication Circuits

Find the CAN C+ and CAN C- circuits to check the communication circuits. Connect the voltmeter’s black lead to the ground and the red one to CAN C+. The mechanic will see 2.6 volts with the engine off and the key on.

Then, attach the red one to the CAN C- and 2.4 volts will show on the voltmeter. These results may vary depending on the producers of the voltmeter.

This is how an experienced mechanic will solve the U010C DTC code on Cummins 6.7

Other Symptoms of Getting the Code U010C On 6.7L Cummins

Look at these warning signs when the U010C code appears on the car’s dashboard.

  • Malfunction indicator light (MIL) ON.
  • The engine won’t get enough power.
  • The car runs fine with a cold engine. But with a warm engine, knocking starts at acceleration.
  • A cold engine is incapable of starting the car.

How Much Does It Cost To Fix U010C On A 6.7L Cummins?

The cost of repairing the Cummins U010C code depends on a few conditions. Depending on their level of competence, different vehicle repair shops charge differently. Some repair shops demand an additional fee for a diagnostic.

The majority of automotive repair shops charge by the hour. The hourly wage ranges from $75 to $150 on average.

If the site changes, the labor costs will also change. The manufacturer and model of your vehicle also impact the final price. Even the cost of repair varies according to the engine type.

If you take your vehicle to a renowned mechanic’s shop, the cost will increase. Because of the vehicle’s complex construction, they charge extra. This makes it challenging for the mechanic to scan codes.

Can You Drive Your 6.7L Cummins with the Code U010C?

Driving your car with the code U010C displayed on the dashboard is not entirely dangerous. But you’ll face specific challenges while driving the car. As you can see, the symptoms are not severe with this code.

The U010C code permits cautious driving. The situation becomes worse when you go faster. Knocking begins as the engine warms up. Because of this, the car’s engine can no longer maintain the desired speed for very long before running out of fuel.

Even if the engine light is slightly off, you may still operate the car. Remember, avoiding driving with the MIL pointing at the DTC U010C code is best. 


The U010C DTC code might not be a severe problem. But it will affect your car’s engine in the long run. You won’t be able to go on a long-distance journey with a flawed communication system.

Hopefully, the discourse on what code U010C means on Cummins 6.7 has provided you with the proper answers you needed. Don’t try to crack the code on your own if you’re new to this issue. 

Take the car to your nearest mechanic shop as soon as you encounter this DTC code. Always perform regular maintenance for maximum output from your vehicle.

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