rail pressure drift high is the Detroit DD Series diagnostic trouble code for a fuel rail pressure sensor circuit concern, and this page documents its official fuel rail pressure sensor circuit troubleshooting sheet. The three-page sheet lists an always-enabled continuous monitor, a 2-second duration and a 25% engine derate with MIL and CEL, then walks the sensor and Motor Control Module (MCM) harness checks.
rail pressure drift high document details
| Brand | Detroit |
| Model coverage | DD Series — DD13, DD15, DD16 |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| SPN | 164 |
| FMI | 2 |
| Fault | Fuel Rail Pressure Drift High |
| Emissions / revision | EPA07, GHG14 — Copyright 2017 |
| Pages | 3 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Description, continuous monitor and engine derate
- Sensor disconnection and connector inspection
- Harness voltage measurement (pins 1 and 3)
- MCM 120-pin connector resistance checks
- Sensor or MCM replacement decision
Troubleshooting steps summarised
The technician disconnects and inspects the sensor, then with the ignition ON measures 4.5 to 5.5 volts between pins 1 and 3 of the harness connector. The procedure checks the supply and signal wiring to pins 102, 58 and 78 of the MCM 120-pin connector, confirms circuit resistance below 5 ohms and signal-to-supply resistance above 10K ohms, 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 GHG14 hardware and the MCM 120-pin fuel-system 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 pressure drift high guide
Technicians facing a continuously drifting high rail-pressure reading, a 25% derate, or a suspect sensor feed use this sheet to separate wiring from sensor faults.
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