Reference meaning
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.
Narrow by vehicle
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
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.
Scan worksheet →Manufacturer communications
13Original wording in English
MACK
CBR - Air Production Modulator (APM) DTC C10129B - High/Excessive Flow - PR (4).
VOLVO
CBR - Air Production Modulator (APM) DTC C10129B - High/Excessive Flow - VN (4).
MACK
CBR - Air Production Modulator (APM) DTC C10129B - High/Excessive Flow PR(4).
VOLVO
This document provides guidance for addressing the APM DTC C10129B fault," High/Excessive Flow" This fault was introduced by a previous APM software package and requires specific containment actions.
Check vehicle applicability
11A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Fiat | 500 ↗ | 2016 |
| Fiat | 500 ↗ | 2015 |
| Mack | PIONEER PR (4) ↗ | 2026 |
| Mack | PIONEER PR (4) ↗ | 2025 |
| Volvo | VN ↗ | 2025 |
| Volvo | VNL (4) ↗ | 2026 |
| Volvo | VNL (4) ↗ | 2025 |
| Volvo | VNL (4) ↗ | 2024 |
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.