rail pressure drift low is the Detroit DD Series diagnostic trouble code for fuel rail pressure sensor – drift low, and this page documents its official fuel rail pressure sensor circuit troubleshooting sheet. The three-page sheet documents the monitored parameter, enabling conditions and a 25% derate with MIL and CEL, then the fuel rail pressure sensor and Motor Control Module (MCM) wiring checks.
rail pressure drift low document details
| Brand | Detroit |
| Model coverage | DD Series — DD13, DD15, DD16 |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| SPN | 164 |
| FMI | 21 |
| Fault | Fuel Rail Pressure Sensor – Drift Low |
| Emissions / revision | EPA07 — Copyright 2017 |
| Pages | 3 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Description, dash lamps 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
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 then verifies the supply and signal wires to pins 102, 58 and 78 of the MCM 120-pin connector, checks circuit resistance below 5 ohms and signal-to-supply resistance above 10K ohms, and re-tests before replacing the sensor or the MCM. If the fault is still unresolved after the wiring is confirmed, the sheet directs the technician to contact the Detroit Customer Support Center at 800-445-1980.
Applicable truck models covered
It applies to Detroit DD Series engines (DD13, DD15 and DD16) built to EPA 2007 emissions using 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 drift low guide
Technicians chasing a low-drifting rail-pressure reading, a repeated derate, or a suspect signal circuit rely on this sheet to isolate the fault to wiring or the sensor.
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