# C1012 on the 2025 Mack Pioneer

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name C1012

- [11028040](https://open.wenmarpro.com/bulletins/11028040), 2026-02-03: CBR \- Air Production Modulator \(APM\) DTC C10129B \- High/Excessive Flow \- PR \(4\).
- [11026027](https://open.wenmarpro.com/bulletins/11026027), 2025-12-03: CBR \- Air Production Modulator \(APM\) DTC C10129B \- High/Excessive Flow PR\(4\).
- [11023447](https://open.wenmarpro.com/bulletins/11023447), 2025-10-01: 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.
- [11021321](https://open.wenmarpro.com/bulletins/11021321), 2025-08-04: CBR \- This document provides guidance for addressing the Air Production􀁡Modulator \(APM\) DTC C10129B fault, "High/Excessive Flow" This fault was introduced by a previous APM software package and requires specific containment actions.