Diagnostics
Detroit Fault Codes: Meanings, Causes & Fixes
In-depth, plain-English guides to Detroit fault codes and error codes. Each guide covers what the code means, what triggers it, the most common causes, and the first things to check before you call the dealer.
- SPN100FMI17Engine Oil Pressure Plausibility Error
- SPN102FMI18This Fault Code Sets When the Motor Control Module (MCM) Detects That the Measured Intake Manifold Pressure is lower than the Desired Intake Manifold Pressure by more than the Accepted Threshold
- SPN1235FMI9This fault code sets when the Aftertreatment Control Module (ACM) has not received a communication message from the Motor Control Module (MCM).
- SPN4364FMI1This Code Sets When the Aftertreatment Control Module (ACM) Detects Poor Selective Catalyst Reduction (SCR) NOx Conversion Efficiency
- SPN653FMI5Injector Cylinder #3 Needle Control Valve Circuit Open
- SPN723FMI8This Code Sets When the Camshaft Position (CMP) Sensor Signal Has Timed Out for an Extended Period of Time
Safety-critical: confirm before use
Torque, lifting, and load-chart values are safety-critical. Never operate from these figures alone. Confirm against the official manual and a qualified technician.