This CAT C-12 PTO throttle troubleshooting document provides the official Caterpillar diagnostic procedure for fault code 0030-13, “PTO Throttle out of calibration (29).” It covers the conditions that generate the code, system response behavior, possible performance effects, and the required test steps for engines in the 3406E, C-10, and C-12 on-highway family.
Official CAT C-12 PTO throttle troubleshooting document details
| Brand | Caterpillar (CAT) |
| Model coverage | C-12 Truck Engine 9NS; also applicable to 3406E, C-10 (configurations 8YS, 9NS, 5DS, 1LW) |
| System / Group | Engine Electronic Control — PTO Throttle Position Sensor Circuit (SMCS 1913-038) |
| Publication no. | RENR1328-08 |
| Year / Revision | Published 01/10/2008, updated 16/10/2008 |
| Pages | 1 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- PID 0030 FMI 13 — Conditions Which Generate This Code
- System Response
- Possible Performance Effect
- Troubleshooting — Test Step 1: Remote PTO Accelerator Position Sensor Circuit – Test
Applicable truck models
This document applies to Caterpillar on-highway truck engines in the 3406E, C-10, and C-12 families, specifically serial prefixes 8YS, 9NS, 5DS, and 1LW. The C-12 Truck Engine configuration 9NS00001-UP is explicitly referenced. The fault code activates when the Engine Control Module (ECM) detects a PTO throttle duty cycle below 5 percent or above 95 percent for more than two seconds while PTO Configuration is set to “Remote Throttle.” When the code is active, the ECM forces the engine to low idle and Caterpillar Electronic Technician (ET) displays “DIAG” next to the Throttle Position status. The remote accelerator pedal position sensor cannot be calibrated; the prescribed remedy is to perform the “Remote PTO Accelerator Position Sensor Circuit – Test” procedure. For additional technical resources, visit the Caterpillar official support page.
Who needs this CAT C-12 PTO throttle troubleshooting manual
Fleet mechanics and workshop owners diagnosing DTC 0030-13 on 3406E, C-10, or C-12 engines will need this reference. It is essential for anyone servicing PTO-equipped trucks that default to low idle due to a throttle calibration fault.
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