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DTC codes / U01xx · Lost communication with a control module / U010D

U010DLost Communication With Turbocharger/Supercharger Control Module B

U010D means the engine control module (ECM) has lost the controller area network (CAN) communication link with the turbocharger or supercharger control module B, which is the second forced-induction control module on the network. The ECM sets this code when it stops receiving the periodic status messages that module is programmed to broadcast, not when it detects a mechanical boost fault.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaLost communication with a control module

Symptoms you may notice

  • Illuminated check engine light, often with no other noticeable symptoms
  • Reduced engine power or a limp-home mode because boost control is disabled
  • Poor acceleration and sluggish throttle response from a forced-induction engine
  • Rough running or stalling if the module also shares a ground or power circuit with other components
  • Other communication-related warning lights or modules dropping offline intermittently
  • No start in rare cases where the failed module corrupts the entire CAN bus

Common causes, most likely first

  1. Open, shorted, or corroded wiring in the CAN bus circuit between the ECM and turbocharger/supercharger control module B
  2. Failed turbocharger/supercharger control module B itself, often due to internal circuit board damage or water intrusion
  3. Blown fuse or poor ground connection feeding the module, causing it to power down intermittently
  4. Loose or damaged connector pins at either the ECM or the module, especially after prior service work
  5. CAN bus voltage disturbance from another module on the same network pulling the bus low
  6. Aftermarket electrical accessories or poor previous repairs tapping into the CAN wiring
  7. Battery or charging system problems causing low voltage that drops the module offline

How to diagnose and fix it

  1. Scan all modules for communication codes and record which modules are online to confirm the scope of the bus fault
  2. Inspect the turbocharger/supercharger control module B connectors and the ECM connectors for corrosion, pushed pins, or water intrusion
  3. Check the module's power and ground circuits with a multimeter and verify the fuse is intact and not intermittently open
  4. Measure CAN bus resistance and voltage at the module connector to confirm the bus is intact and not shorted
  5. Perform a wiggle test on the harness while watching live communication status to catch intermittent opens
  6. If wiring and power checks pass, substitute a known-good module or perform a module communication test to confirm the module has failed
  7. After repair, clear codes and verify the module stays online through a full drive cycle with boost commanded

What a U010D really tells you

  • This code is a communication fault, not a boost fault, so replacing the turbocharger or supercharger itself based on U010D alone is a costly misdiagnosis.
  • A weak or failing battery can drop the module offline long enough to set U010D without leaving any other low-voltage codes, so always load-test the battery first.
  • Water intrusion into the module connector or housing is a common hidden cause on vehicles where the module is mounted low in the engine bay.
  • Other modules on the same CAN bus can pull the network down and make the turbocharger control module appear dead, so check for additional communication codes before condemning the module.
  • A module that communicates fine when cold but drops out when hot points to an internal solder joint failure rather than a wiring problem.

Can I keep driving with U010D?

You can usually drive the vehicle to a repair shop, but expect reduced power and avoid heavy acceleration or towing until the fault is repaired. If the engine runs poorly or stalls, stop driving and have the vehicle towed.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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