Volvo All Engines (2010 Emissions) Fault Code: SPN 631 FMI 8 PID: PSID 124 Calibration memory

Conditions for diagnostic trouble code (DTC):
1) Internal fault in electronic control unit (ECU)
2) Incorrect self test in the engine control module (ECM)

Observable symptoms
1) Engine does not start

Probable cause
1) Aftertreatment Control Module (ACM)

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