Cummins fault code 629 is the Cummins ISX11.9 CM2250 diagnostic document for the turbocharger 1 compressor inlet pressure calculation, logged as SPN 1176, FMI 1/18 with a amber lamp. An engine torque derate will occur when this fault is active. The ECM calculates a differential across the turbocharger from the intake manifold pressure sensor and the crankcase pressure sensor; the code sets when the calculated turbocharger compressor inlet pressure differential exceeds the threshold. This DiagTechPro library page outlines what the official Cummins troubleshooting procedure contains before you download the full PDF.
Cummins fault code 629 document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 (2010-12), ISX12 CM2250 (2010-12) |
| System / Group | Electronic Control Module (ECM) — DTCs |
| Fault code / SPN / FMI | 629 / SPN 1176 / FMI 1/18 |
| PID / Lamp | P314 / Amber |
| Year / Revision | Not stated in the extract |
| Pages | 12 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview and Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code Is Active
- Conditions for Clearing the Fault Code
- Shop Talk and troubleshooting steps
Applicable truck models and engines
This Cummins DTC applies to ISX11.9 CM2250 (2010-12) and ISX12 CM2250 (2010-12) engines, and the shared circuit information also references the ISB6.7, ISC8.3, ISL9 and ISX15 CM2250 platforms. Always match the turbocharger compressor inlet pressure wiring against the OEM diagram before testing, and confirm the diagnosis with the Cummins INSITE electronic service tool. Full engine specifications are published on the official Cummins website.
Who needs this Cummins fault code 629 manual
Workshop technicians, fleet maintenance teams and owner-operators diagnosing a turbocharger compressor inlet pressure concern on ISX11.9 or ISX12 CM2250 engines use this document to read the CM2250 diagnostic conditions, the action the ECM takes, and the exact steps to clear the code.
The complete PDF (12 pages) is available in the DiagTechPro manuals library; a free account is required to download it. This reference copy helps technicians prepare parts and test steps before servicing the engine.
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