rail pressure circuit high is the Detroit DD Series diagnostic trouble code for fuel rail pressure sensor circuit failed high, and this page documents its official fuel rail pressure sensor circuit troubleshooting sheet. The three-page sheet lists an always-enabled monitor, a 2-second duration and a 25% derate with MIL and CEL, then walks the high-side checks on the Motor Control Module (MCM) harness.
rail pressure circuit high document details
| Brand | Detroit |
| Model coverage | DD Series — DD13, DD15, DD16 |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| SPN | 164 |
| FMI | 3 |
| Fault | Fuel Rail Pressure Sensor Circuit Failed High |
| Emissions / revision | EPA07 — Copyright 2017 |
| Pages | 3 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Description, monitor and engine derate
- Sensor disconnection and connector inspection
- Harness voltage measurement (pins 1 and 3)
- MCM 120-pin connector resistance and short checks
- Sensor or MCM replacement decision
Troubleshooting steps summarised
With the sensor disconnected and inspected, the technician measures 4.5 to 5.5 volts between pins 1 and 3 of the harness connector with the ignition ON. The sheet verifies the supply and signal wires to pins 102, 58 and 78 of the MCM 120-pin connector, checks resistance below 5 ohms and signal-to-supply resistance above 10K ohms to find a short to supply, and re-tests before replacing the sensor or the MCM.
Applicable truck models covered
It covers Detroit DD Series engines (DD13, DD15 and DD16) built to EPA 2007 emissions with the MCM 120-pin harness. For engine specifications and warranty coverage, refer to the official Demand Detroit service resources. These troubleshooting steps are cross-checked with the Detroit Diesel Diagnostic Link (DDDL) and the official Demand Detroit service resources.
Who needs this rail pressure circuit high guide
Technicians diagnosing a shorted-high signal, a short to the 5-volt supply, or a corroded MCM pin use this sheet to isolate the fault before replacing parts.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download the complete step-by-step document.
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