This Cummins fault code 2558 document is a troubleshooting procedure for an auxiliary PWM driver voltage-below-normal or short-to-low fault. It explains how the ECM signal is used by the transmission shift modulator and how OEM wiring affects the return circuit. The file is intended for fault isolation using INSITE™ and standard multimeter checks.
Official Cummins fault code 2558 document details
| Brand | Cummins |
| Model coverage | QSB3.3; listed file group: ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; Auxiliary Pulse Width Modulated (PWM) Driver 1 Circuit; transmission shift modulator circuit |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 13 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Shop Talk
- FAULT CODE 2558 (QSB3.3)
- Auxiliary PWM Driver 1 – Voltage Below Normal or Shorted to Low Source
- 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
The procedure applies to Cummins QSB3.3 fault code 2558 coverage in the document, with the file catalog also identifying Cummins ISB6.7 CM2150 (2007-09) DTC material. The affected circuit is the auxiliary PWM driver 1 circuit used for the transmission shift modulator signal; the return circuit depends on OEM wiring and may return to the ECM or to chassis or block ground. Component location and pin identification must be taken from the OEM wiring diagram for the vehicle being serviced. For official manufacturer support, visit Cummins official website.
Who needs this Cummins fault code 2558 manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this manual when an amber lamp and SPN 697 FMI 4 indicate low signal voltage at the analog torque circuit. It is useful for checking inactive codes, connector condition, modulator resistance, diagnostic supply voltage, short-to-ground faults, pin-to-pin shorts, and final code clearing with INSITE™.
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