Volvo All Engines (2017 Emissions) Fault Code: P20A800 PID: ACM Reductant Injection Air Pressure Control Valve Circuit Low
Volvo All Engines (2017 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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SERVICE MANUAL 3000 AND 4000 SERIES GEN 4 GENERATION – ALLISON
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