U010D: Lost Communication With Turbocharger/Supercharger Control Module B

What it means

A control module has lost communication with turbocharger/supercharger control module B. Boost control may be affected on vehicles that use this module.

How it works

Turbocharger/supercharger control module B manages or coordinates boost-related functions on vehicles equipped with a second designated module. Other modules expect it to send network messages; U010D sets when messages from module B are missing long enough to count as a communication loss. The code does not establish whether module B or its power, wiring, or network path is at fault.

Common causes

Most likely first.

1. Loss of module power or ground
2. Open, shorted, or damaged communication wiring or connector
3. Module or gateway fault

Symptoms

• Warning lights or messages
• Communication faults in other modules
• Reduced engine power may occur

How to diagnose it

1. Save all modules' codes and freeze-frame data, noting which ones report lost communication with control module B and whether the fault is current.
2. Check battery condition and the fuses, power supply, and ground connections assigned to module B.
3. Inspect module B's connector and nearby harness for corrosion, water entry, loose pins, or damage to the communication wiring.
4. Check with a scan tool whether module B responds and whether other modules sharing its network are also offline.
5. If module B has proper power and ground but does not respond, test its communication circuit and gateway path against the manufacturer's specification.

Common fixes

• Charge or replace a weak battery and clean poor battery connections.
• Replace a failed fuse or repair module B's power or ground connection.
• Repair damaged wiring or clean and secure the connector at control module B.
• Correct a confirmed gateway or network fault that blocks communication with module B.
• Replace or reprogram control module B only after its supply and communication circuits pass testing.

Can I keep driving?

If the vehicle remains controllable and has no reduced-power warning, drive gently only as needed to reach a safe place or repair facility; avoid hard acceleration and towing. Stop if power becomes unpredictable or a serious engine warning appears.