Lost Communication with Turbo/Supercharger 'B' Control Module
Diagnostic trouble code U010D indicates that the engine control module (ECM/PCM) has lost communication with the turbocharger or supercharger 'B' control module over the vehicle's data bus, typically the CAN bus. This module manages a second turbo or supercharger in multi-boost or complex forced induction systems. Without this communication, the ECM cannot receive critical data on the position, speed, or status of the boost device, leading to reduced performance, limp mode activation, or potential mechanical damage from uncontrolled boost pressure.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Faulty turbocharger/supercharger 'B' control module
- Open or short circuit in the CAN bus wiring to the module
- Corroded, loose, or damaged connector at the turbo/supercharger control module
- Failed CAN bus termination resistor
- Low voltage or power supply failure to the turbo/supercharger control module
- Faulty ECM/PCM preventing communication
- Electromagnetic interference on the data bus wiring
3. Symptoms You Will Notice
- Reduced engine power or acceleration
- Limp mode activated with check engine light on
- Abnormal boost pressure or turbocharger operation
- Possible engine stalling or rough idle
4. Step-by-Step Diagnosis
Scan for all stored codes and freeze frame data
Inspect the turbo/supercharger 'B' control module connector for corrosion, damage, or looseness
Check CAN bus wiring for opens, shorts, or high resistance between the ECM and the module
Verify power and ground at the turbo/supercharger control module
Test CAN bus termination resistance at the module or ECM
If wiring and power are good, suspect a failed module or ECM
5. Frequently Asked Questions
Is it safe to drive?▼
No, driving with this code is not recommended. The loss of communication can lead to uncontrolled boost pressure, potentially causing engine damage or sudden power loss. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs vary widely, typically ranging from $200 to $1,200 depending on the root cause. A simple wiring repair may cost $200-$400, while replacing a turbo control module can run $500-$1,200 including labor.