Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
To diagnose the P20E9 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
The pressure sensor information is used by Reductant Control Module; this module manages the reductant pressure system driving the PWM signal to the pump (corresponding to a speed setpoint for the reductant pressure pump) in order to build the pressure in the reductant pressure pipeline after the system start-up. The pressure signal is also used to control the reductant pressure in a closed loop, to supply a stable value to the reductant valve during the dosing, and to empty the reductant pressure line in After-run. The reductant pressure is monitored for pressure control governor deviation. The reductant pressure sensor signal is compared with a threshold and a pressure control governor deviation fault is reported to the Engine Control Module (ECM) after a specified time when detected. The Diagnostic Trouble Code (DTC) will be set when the Reductant Control Module detects that the reductant pressure is less than a calibrated threshold for 20 s.
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