Volvo All Engines (2013 Emissions) Fault Code: P20A800 PID: ACM Reductant Injection Air Pressure Control Valve Circuit Low

Conditions for diagnostic trouble code (DTC)
The voltage at pin A174.A:21 is below normal value

Diagnostic operating conditions
Ignition key in ON position

Observable symptoms
Uncontrolled air consumption

Probable cause
1) Short circuit to ground
2) Connector
3) Wiring harness
4) Reductant Injection Air Pressure Control Valve Control
5) Aftertreatment Control Module (ACM)

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