Damaged, corroded, or disconnected wiring or connector at the turbocharger/supercharger control module; Open or shorted CAN bus wiring between the ECM and the turbocharger control module; Failed turbocharger/supercharger control module or its internal CAN transceiver; Poor ground or power supply to the turbocharger control module, causing it to drop offline; Software or calibration issue in the ECM or turbocharger control module that disrupts messaging; Aftermarket electronic accessories or poor previous repairs that disturb the CAN bus; Less commonly, a faulty ECM or another module that corrupts CAN bus communication

DTC codes / U01xx · Lost communication with a control module / U010C

U010CLost Communication With Turbocharger/Supercharger Control Module A

U010C means the engine control module (ECM) or another primary controller has lost the controller area network (CAN) communication link with the turbocharger or supercharger control module, often called module A. The ECM sets this code when it expects regular status messages from that module and receives none within a calibrated time window, indicating a communication failure rather than a direct fault in the turbocharger itself.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaLost communication with a control module

Symptoms you may notice

Illuminated check engine light, often accompanied by a message on the driver information display
Reduced engine power or limp mode, because the ECM cannot trust boost control without module feedback
Rough running or poor acceleration if the turbocharger control module also manages wastegate or variable-geometry actuator position
No noticeable performance change in some vehicles, especially if the module is only used for monitoring and the default actuator position is safe
Other unrelated warning lights or communication codes stored in multiple modules if the CAN bus is disturbed
Intermittent symptoms that appear or disappear with temperature changes, vibration, or moisture

Common causes, most likely first

Damaged, corroded, or disconnected wiring or connector at the turbocharger/supercharger control module
Open or shorted CAN bus wiring between the ECM and the turbocharger control module
Failed turbocharger/supercharger control module or its internal CAN transceiver
Poor ground or power supply to the turbocharger control module, causing it to drop offline
Software or calibration issue in the ECM or turbocharger control module that disrupts messaging
Aftermarket electronic accessories or poor previous repairs that disturb the CAN bus
Less commonly, a faulty ECM or another module that corrupts CAN bus communication

How to diagnose and fix it

Record all stored codes and freeze-frame data from every module before clearing anything, then verify U010C returns after a test drive
Inspect the turbocharger/supercharger control module connector and harness for corrosion, chafing, pushed pins, or loose terminals
Measure CAN bus resistance and check for shorts to ground or power at the module connector with the ignition off
Check the module's power and ground circuits under load using a wiring diagram and a multimeter or test light
Perform a voltage drop test on the module ground circuit while cranking and running to rule out a weak ground
If wiring and power are good, substitute a known-good module of the same part number or perform a module communication test with a factory-level scan tool
After repair, clear codes and complete a drive cycle that includes boost operation to confirm communication is restored

What U010C does not tell you

U010C is a communication code, so it does not confirm the turbocharger or supercharger itself has failed; many vehicles set it from a loose connector or chafed wire that costs little to repair.
A weak or corroded ground at the turbocharger control module can cause intermittent U010C without any visible damage to the CAN wires, so voltage drop testing is essential.
Aftermarket alarms, remote starters, or poorly installed accessories tapped into the CAN bus are a frequent hidden cause of lost communication codes on otherwise healthy vehicles.
Some vehicles will run with a default boost strategy when U010C is stored, so the driver may notice only the warning light and no performance change, leading to misdiagnosis as a harmless glitch.
Clearing U010C without checking freeze-frame data can erase the exact conditions that triggered the fault, making an intermittent wiring issue much harder to find later.

Can I keep driving with U010C?

You can usually drive the vehicle to a repair shop, but avoid heavy acceleration or towing because the ECM may be limiting boost and the engine can enter limp mode without warning. If the check engine light flashes or the engine runs poorly, stop driving and have the vehicle towed.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.