This C15 brake switch DTCs troubleshooting document provides the complete diagnostic procedure for fault code 0246-11 (Brake Pedal Switch #1 Fault) on Caterpillar C15 on-highway truck engines with MXS prefix. It details how the ECM detects a mismatch between service brake pedal position switch 1 and switch 2, the resulting system responses, and a five-step circuit test to isolate the fault.
Official C15 brake switch DTCs document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine MXS (MXS00001-UP) |
| System / Group | Troubleshooting — SMCS 1435-038-BRK |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, updated 25/02/2009 |
| Pages | 10 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0246-11 Brake Pedal Switch #1 Fault — Conditions Which Generate This Code, System Response
- Service Brake Pedal Position (Switch 1) Circuit — Test: System Operation Description
- Kickout Switches and Transmission Style parameter usage (Table 1)
- Test Step 1: Check the Status for the Service Brake Pedal Position (Switch 1) via Cat ET
- Test Step 2: Verify the Configuration of the Switch (hardwired vs. J1939 data link)
- Test Step 3: Inspect the Electrical Connectors and the Wiring (P1-45, P1-5 terminal locations)
- Test Step 4: Create an Open Circuit and a Short Circuit at the Switch
- Test Step 5: Check for Proper Operation of the ECM (test ECM swap procedure)
Applicable truck models
This manual applies to the Caterpillar C15 on-highway truck engine, configuration prefix MXS (MXS00001-UP). The Transmission Style parameter must be set to Automatic Option 2 or Automatic Option 3 for DTC 0246-11 to become active. The document references ECM connector P1 terminal locations including P1-45 (service brake pedal position switch 1), P1-64 (switch 2), P1-22 (clutch pedal position), and P1-62 (neutral switch). The procedure requires Caterpillar Electronic Technician (Cat ET) software to monitor switch status and verify correct operation. For additional product support, visit Caterpillar official support.
Who needs this C15 brake switch DTCs manual
Diesel mechanics and workshop owners diagnosing cruise control, PTO, or idle speed failures on C15-powered trucks will use this procedure. It is essential when DTC 0246-11 is logged and the engine refuses to engage cruise control or PTO functions due to a brake pedal switch mismatch.
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