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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. Its meaning is in the manufacturer's service information.

Bulletins for this model year that name C1012
CBR 2408-16 2026012026-02-03. Service bulletin. CBR - Air Production Modulator (APM) DTC C10129B - High/Excessive Flow - PR (4).
CBR 2408-15 2025112025-12-03. Service bulletin. CBR - Air Production Modulator (APM) DTC C10129B - High/Excessive Flow PR(4).
CBR 2408 0920252025-10-01. Service bulletin. 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.
CBR 2408 0720252025-08-04. Service bulletin. 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.

4 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.