This 11-page Caterpillar troubleshooting document covers CAT C15 DTC 0212-04, the diagnostic code triggered when the 5 Volt Sensor Supply #1 voltage drops below 4.84 VDC for more than one second. It provides the complete 5 Volt Engine Pressure Sensor Supply Circuit test procedure, including connector inspections, resistance checks, and ECM voltage verification for C15 on-highway truck engines (MXS, NKS, or RKS prefix).
Official CAT C15 DTC 0212-04 document details
| Brand | Caterpillar (CAT) |
| Model coverage | C15 Truck Engine — MXS, NKS, RKS configurations |
| System / Group | Engine Control Module (ECM) — 5 Volt Sensor Supply / DTCs |
| Publication no. | RENR5088-10 |
| Year / Revision | Published 01/02/2009, updated 25/02/2009 |
| Pages | 11 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- 0212-04 5 Volt Sensor Supply #1 voltage low — Conditions Which Generate This Code, System Response
- 5 Volt Engine Pressure Sensor Supply Circuit – Test — System Operation Description
- P2 ECM Connector Pin-Out (P2-15, P2-17, P2-28, P2-54, P2-57, P2-72, P2-74, P2-80)
- Sensor Location Illustrations — left side and right side
- Test Step 1: Inspect Electrical Connectors and Wiring
- Test Step 2: Check for Active Diagnostic Codes
- Test Step 3: Disconnect the +5 V Sensors while Monitoring Active Diagnostic Codes
- Test Step 4: Check the +5 V Supply Wire for a Short to Engine Ground or another Wire
- Test Step 5: Check the +5 V Supply and the Sensor Common for an Open Circuit
- Test Step 6: Check the +5 V Supply at the ECM
Applicable truck models
This procedure applies to Caterpillar C15 on-highway truck engines with MXS00001-UP configurations. It also references NKS and RKS serial-number prefixes. The sensors covered include the atmospheric pressure sensor, intake manifold pressure (boost) sensor, engine oil pressure sensor, and the pressure sensor for the intake valve actuation system — all powered by the ECM’s regulated 5.0 ± 0.16 VDC supply. Related diagnostic codes addressed in the same circuit test are 212-03, 232-03, and 232-04. For official Caterpillar technical resources, visit Caterpillar Support.
Who needs this CAT C15 DTC 0212-04 manual
Diesel mechanics and workshop owners diagnosing a check engine lamp with an active or logged 0212-04 code on a C15-powered truck need this document. It walks through each test step — from a 45 N (10 lb) pull test on ECM connector wires through resistance measurements exceeding 20,000 Ohms, down to final ECM replacement if the 5 VDC output is out of specification.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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