U010C: Lost Communication With Turbocharger/Supercharger Control Module A

What it means

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

How it works

Turbocharger/supercharger control module A manages or coordinates boost-related functions on vehicles equipped with that module. Other modules expect it to send messages over the vehicle network; U010C sets when those messages are missing long enough to be treated as a communication loss. It does not by itself identify whether the module, its power supply, or the network path failed.

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, then note which modules report lost communication with control module A and whether the fault is current or stored.
2. Check battery condition and relevant fuses, then inspect module A's power and ground connections for looseness, corrosion, or damage.
3. Inspect the wiring and connectors at turbocharger/supercharger control module A and along its communication-bus route for chafing, water intrusion, or disconnected pins.
4. Use a scan tool to see whether module A responds and whether other modules on the same network are also offline.
5. If power and ground are present but module A remains offline, test the communication circuit and gateway routing using the vehicle's wiring information and manufacturer's specification.

Common fixes

• Charge or replace a weak battery and repair any poor battery connections.
• Replace a blown fuse or repair a failed power or ground connection to module A.
• Repair damaged communication wiring or clean and secure module A's connector.
• Repair a network gateway fault if testing confirms it is preventing messages from reaching module A.
• Replace or reprogram turbocharger/supercharger control module A only after its power, ground, wiring, and network path check out.

Can I keep driving?

If the vehicle drives normally and has no boost or power warning, a short, cautious trip may be possible, but avoid hard acceleration or towing because boost control may be affected. Stop safely if power drops sharply or a serious engine warning appears.