This Cummins fault code 2557 document is a troubleshooting PDF for the auxiliary PWM driver circuit and related transmission shift modulator checks. It explains the fault reason, likely causes, guided diagnostic steps, ECM and OEM harness checks, and clearing procedure for the inactive code.
Official Cummins fault code 2557 document details
| Brand | Cummins |
|---|---|
| Model coverage | QSB3.3; file group listed as ISB6.7 CM2150 (2007-09) / DTCs |
| System/Group | Auxiliary Pulse Width Modulated (PWM) Driver 1 Circuit; transmission shift modulator; ECM and OEM harness diagnostics |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 20-Jul-2010; model year unknown |
| Pages | 13 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Shop Talk
- FAULT CODE 2557 (QSB3.3)
- Auxiliary Pulse Width Modulated (PWM) Driver 1 Circuit
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the transmission shift modulator and circuit.
- Guided Step 3 – Check the ECM and OEM harness.
- Guided Step 4 – Clear the fault code.
Applicable truck models
This file applies to Cummins QSB3.3 fault code 2557 diagnostics where Auxiliary PWM Driver 1 reports voltage above normal or shorted to high source. The file information also places the PDF in the Cummins ISB6.7 CM2150 (2007-09) DTC group, but the extracted fault-code page itself names QSB3.3 and requires the OEM wiring diagram for the transmission shift modulator location and return circuit configuration. The procedure covers vehicles where the return circuit may be wired back to the ECM, chassis ground, or block ground, depending on OEM wiring. For official manufacturer information, visit Cummins official website.
Who needs this Cummins fault code 2557 manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this fault code 2557 manual when a truck cannot control the transmission and INSITE™ reports SPN 697 FMI 3. It is useful for checking connectors, modulator resistance, diagnostic supply voltage, open circuits, pin-to-pin shorts, ECM connectors, and OEM harness faults before replacing components.
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