What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer communications
2Original wording in English
MACK
Reported code forms C103508
CBR - This procedure provides a temporary corrective action for the “Lost Communication to Alternator” message and Vehicle Master Control Unit (VMCU) DTC C103508 caused by a software issue.
MACK
Reported code forms C103508
CBR - Lost Communication to Alternator Message - DTC C103508.
Check vehicle applicability
2A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Mack | PIONEER PR (4) | 2026 |
| Mack | PIONEER PR (4) | 2025 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.