U010C

Universal

Lost Communication With Turbocharger/Supercharger Control Module A

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Medium Severity

The vehicle's network has detected that it cannot communicate with Turbocharger/Supercharger Control Module A. Depending on the vehicle, that module helps manage forced-induction operation, so communication loss may limit boost or engine power. This code identifies a communication problem; it does not by itself prove the turbocharger, supercharger, or control module has failed.

Report an error with this code

⚠️ Before You Begin (Safety First)

If the vehicle loses power, enters a reduced-power mode, or behaves unpredictably, pull over safely and arrange assistance if continuing would be unsafe. Avoid demanding driving until the cause is diagnosed. If the vehicle otherwise operates normally, arrange prompt diagnosis and watch for worsening symptoms.

Common Symptoms

  • The check-engine or another warning light may come on because a module has recorded a communication fault.
  • Reduced engine power or limited boost may occur if the vehicle's control strategy restricts forced-induction operation when communication is lost.
  • The vehicle may enter a reduced-power or protective operating mode, depending on its design.
  • There may be no noticeable symptoms if the communication loss is intermittent or the vehicle can continue operating without the missing module data.

Common Causes

  • A loose, damaged, corroded, or poorly connected harness or connector may interrupt communication with Module A.
  • A fault in the module's power supply or ground may prevent it from communicating.
  • A fault in the vehicle network wiring or another network component may disrupt messages to or from Module A.
  • Low or unstable vehicle voltage may interfere with module operation or network communication.
  • Module A itself may have an internal fault, but this should be considered only after its power, ground, connectors, and network circuits are checked.

Diagnostic Steps

  1. Note warning lights and any change in engine power or drivability; this helps determine whether the issue is affecting vehicle operation.
  2. With the vehicle safely parked and switched off, visually check accessible wiring and connectors related to the turbocharger/supercharger control system for looseness or visible damage. Do not disconnect components unless the vehicle-specific service information says it is safe.
  3. Check the battery terminals for looseness or visible corrosion, since unstable electrical supply can contribute to communication problems.
  4. If you have a suitable scan tool, record codes from all modules before clearing anything. Other communication codes can help show whether the fault is isolated or part of a wider network issue.
  5. Have a qualified technician perform vehicle-specific power, ground, and network-circuit tests if the fault persists; avoid probing circuits without the correct information and equipment.

When to Call a Professional

Use a scan tool capable of communicating with all vehicle modules. Check which modules report communication faults and whether Module A responds, then use vehicle-specific service information to inspect its power, ground, connectors, and network circuits. Confirm network integrity before considering module replacement; a communication code alone does not identify the failed part.

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Commonly Asked Questions

Does U010C mean the turbocharger or supercharger has failed?

No. It indicates lost communication with Turbocharger/Supercharger Control Module A. The cause may be a wiring, power, ground, network, or module problem; the code alone does not confirm a mechanical forced-induction failure.

Can I drive with U010C?

It depends on how the vehicle behaves. If power is reduced or operation is unpredictable, stop somewhere safe and seek assistance if needed. If it drives normally, arrange diagnosis promptly and avoid demanding driving until the fault is understood.

Why should other modules be scanned too?

Other modules may record related communication faults. Their codes and whether Module A responds can help distinguish an issue isolated to that module from a broader network or electrical problem.

Should Module A be replaced as soon as this code appears?

No. Check its power, ground, connectors, and network circuits using vehicle-specific service information before considering replacement. Exact diagnostic steps depend on the vehicle's model, year, and engine.

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