Detroit DD16 EPA07 (2007-09) Fault Code: SPN 3242 FMI 8 (MCM) Motor Control Module Has Detected an Impossible Temperature Shift on the Diesel Oxidation Catalyst Inlet Temperature Sensor

NOTE: If 3242-3, 3242-4, 3242-8, 3250-3, 3250-4, or 3250-8 present, fix those first.

1. Compare DOC inlet, DOC outlet, and DPF outlet. They should be within 45 degrees of each other.
2. DOC inlet temperature sensor.
3. DOC inlet temperature sensor connector/harness.
4. DOC outlet temperature sensor.
5. DOC outlet temperature sensor connector/harness.