rail pressure circuit low is the Detroit DD Series diagnostic trouble code for fuel rail pressure sensor circuit failed low, and this page documents its official fuel rail pressure sensor circuit troubleshooting sheet. The three-page sheet warns the fault may be induced by low battery voltage, lists an always-enabled monitor and a 25% derate with MIL and CEL, then walks the low-circuit checks on the Motor Control Module (MCM) harness.
rail pressure circuit low document details
| Brand | Detroit |
| Model coverage | DD Series — DD13, DD15, DD16 |
| System / group | DD Series (EPA 2007-Current) / DTCs |
| SPN | 164 |
| FMI | 4 |
| Fault | Fuel Rail Pressure Sensor Circuit Failed Low |
| Emissions / revision | EPA07 — Copyright 2017 |
| Pages | 3 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Description, low-battery note and engine derate
- Component disconnection and connector inspection
- Harness voltage measurement (pins 1 and 3)
- MCM 120-pin connector resistance and short checks
- Component or MCM replacement decision
Troubleshooting steps summarised
The sensor is disconnected and inspected, and with the ignition ON (key ON, engine OFF) the voltage between pins 1 and 3 is measured for 4.5 to 5.5 volts. The procedure checks the supply and signal wiring to pins 102, 58 and 78 of the MCM 120-pin connector, confirms resistance below 5 ohms, looks for a short between the signal and ground wires, and re-tests before replacing the component 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 low guide
Technicians diagnosing a shorted-low signal, a wiring short to ground, or a fault that appears with weak batteries use this sheet to confirm the cause before replacing the component.
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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