Fix U010C: Mechanic’s solutions that WORKED

The OBD2 code U010C signifies an issue with the communication link between the vehicle’s Engine Control Module (ECM) and the Turbocharger (or Supercharger) Control Module. This code points to a failure in the exchange of vital operational data, affecting the turbocharger’s ability to adjust boost levels properly.

As a result, drivers may experience reduced engine power, especially noticeable under conditions demanding increased power, such as acceleration or carrying heavy loads.

U010C quick overview

Meaning	U010C: Lost Communication with Turbo/Super Charger Control Module
Is it serious?	Yes, this issue can significantly impact engine performance and efficiency.
Possible causes	– Faulty turbocharger control module – Issues with the wiring or connectors – Problems within the CAN (Controller Area Network) bus communication system – Faulty turbocharger actuator
How to diagnose?	Inspect wiring and connectors: Check for damaged wires or loose connections. Monitor CAN bus signals: Use a scan tool to ensure consistent communication signals. Check turbocharger actuator: Verify its operation and connection integrity. Review vehicle recalls and service bulletins: For potential known issues related to U010C.

How to fix U010C – learn from mechanics

I looked into U010C service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.

Case #1: Ram

Vehicle Information 2014 Ram 2500 SLT 6.7L

Issue + Repair History

• Only experiences lack of power on cold start in the morning
• Starts fine but lacks power when put in gear, code sets
• Replaced turbo without module, which temporarily resolved lack of power issue
• Rebuilt turbo installed with old module due to cost concerns
• Code U010C persists after turbo replacement
• When setting the code, VGT position on scan tool reads 0% while PCM commands it to 90%
• Ordered and replaced turbo module

Other OBD2 Codes + Test Results

• U010C: Loss of communication with turbo control module

Mechanic Suggestions

• Backprobe powers and grounds at turbo module when cold, monitor while driving to ensure stability
• Check CAN lines for consistent signals to turbo module
• Consider replacing turbo actuator if connector, power, and CAN signals are good
• Inform the customer about 7 open recalls on the vehicle
• Perform an all-module scan and check for other stored U-codes, active or historical
• Verify turbo module has good power and ground when the symptom is present

Final Fix

• Replaced the turbo module, resolving the lack of power issue

Case #2: Dodge

Vehicle Information 2014 Ram 2500 Laramie Limited 6.7L

Issue + Repair History

• Vehicle not going into regen
• Communication code points towards the turbo
• Replaced turbocharger actuator
• Full power restored after replacement
• Road tested and all systems functioning properly

Other OBD2 Codes + Test Results

• U010C: Communication error

Mechanic Suggestions

• Consider bypassing one of the exhaust temperature sensors as a potential workaround, as a recall may have caused the issue
• Check NOX sensor 1/1 spliced into the same communication lines as the VGT actuator, as a faulty NOX module can affect communication with the VGT actuator
• Monitor EGT and NOX readings, and perform bidirectional testing with the turbo actuator

Final Fix

• Replaced the turbocharger actuator, restoring full power and resolving the communication error issue

Case #3: Ram

Vehicle Information 2011 Ram 3500 ST 6.7L

Issue + Repair History

• Seeking location of “Smart Power Relay”
• Replaced PCM and both O2 sensors
• Installed Totally Integrated Power Module (TIPM) to address P144E, P144F, P0102, and U010C codes
• Subsequently encountered P268C, P268D, P268E, P268F, P2690, and P2691 codes related to injector data incompatibility

Other OBD2 Codes + Test Results

• P144E: EGR bypass status line circuit low
• P144F: EGR bypass status line circuit high
• P0102: MAF circuit low
• U010C: Lost communication with turbocharger control

Mechanic Suggestions

• Replace the TIPM (under hood fuse box) to address initial codes
• Record calibration numbers from each fuel injector and enter them into the scanner to resolve subsequent injector data incompatibility codes

Final Fix

• Replaced the Totally Integrated Power Module (TIPM), resolving initial codes
• Recorded fuel injector calibration numbers and entered them into the scanner, eliminating subsequent injector data incompatibility codes

Diagnostic Step	Brief Explanation
Inspect wiring and connectors	Look for physical damage that could interrupt module communication.
Monitor CAN bus signals	Ensure there are no disruptions in the data flow to and from the turbo control module.
Check turbocharger actuator	A faulty actuator can prevent proper turbo operation, mimicking communication issues.
Review vehicle recalls and service bulletins	Manufacturer advisories can offer insights into common fixes for U010C.
Backprobe powers and grounds	Verify that the turbo module receives stable power and ground, especially under cold conditions.
Replace turbo module/actuator	As seen in both Ram cases, replacing these components often resolves the issue.
Check for related system errors	Additional codes can hint at broader system issues affecting turbo communication.
Record and input calibration numbers	For vehicles like the 2011 Ram 3500, ensuring correct injector calibration can eliminate related errors.

In the provided service cases, from the 2014 Ram 2500 SLT to the 2011 Ram 3500 ST, the diagnostic steps and final fixes highlight the importance of a thorough approach to resolving U010C. Whether it involved replacing the turbo module or actuator, ensuring proper ECM programming, or addressing issues with the Totally Integrated Power Module (TIPM), each case underscores the necessity of accurate diagnostics and understanding the interconnected nature of modern vehicle systems to effectively address lost communication with the turbocharger control module.