VOLVOUU All Engines (2017 Emissions) Fault Code: P017638 PID: ACM Fuel Composition Sensor Circuit, Signal Frequency Incorrect

VOLVOUU All Engines (2017 Emissions) Fault Code: P017638 PID: ACM Fuel Composition Sensor Circuit, Signal Frequency Incorrect

Conditions for diagnostic trouble code (DTC)
Abnormal sensor signal

Diagnostic operating conditions
Ignition key in ON position

Observable symptoms
Service regeneration failure

Probable cause
1) Open circuit on signal wire
2) Short circuit to high
3) Short circuit to ground
4) Connector
5) Wiring harness
6) Aftertreatment Control Module (ACM)
7) Fuel composition sensor