When it comes to Ford vehicles, diagnosing and fixing malfunctions is important to keeping your car in good shape. One of the common issues Ford drivers may experience is the Ford Code P0446, which is an EVAP System Vent Control Circuit DTC. This code is set when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified EVAP canister vent valve duty cycle by PCM command. Ford drivers must understand the causes and possible solutions for this code. We have created a comprehensive table outlining the reasons and solutions for the Ford Code P0446.
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Causes and Solutions for Ford Code P0446
| Cause | Solution |
|---|---|
| VPWR circuit open | Check if the VPWR circuit is open, repair any available courses, or replace the fuse. |
| KAPWR circuit open | Check the KAPWR circuit for open courses and repair or replace the fuse. |
| CANV circuit open | Inspect the CANV circuit for open courses and repair or replace the fuse. |
| CANV circuit short to ground | Check for any shorts to ground and repair or replace any damaged components. |
VPWR Circuit Open
The VPWR circuit, also known as the powertrain control module (PCM) power circuit, is an electrical line that supplies power to the PCM. When the VPWR circuit is open, the PCM is unable to control the EVAP canister vent valve duty cycle. Ford drivers must inspect the VPWR circuit for open circuits and repair or replace the fuse to resolve this issue.
KAPWR Circuit Open
The KAPWR circuit, or the keep-alive power circuit, is an electrical line that supplies power to the PCM and other components. When the KAPWR circuit is open, the PCM is unable to control the EVAP canister vent valve duty cycle. Ford drivers must inspect the KAPWR circuit for open courses and repair or replace the fuse to resolve this issue.
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CANV Circuit Open
The CANV circuit, also known as the control area network voltage circuit, is an electrical line that supplies power to the PCM and other components. When the CANV circuit is open, the PCM is unable to control the EVAP canister vent valve duty cycle. Ford drivers must inspect the CANV circuit for open courses and repair or replace the fuse to resolve this issue.
CANV Circuit Short to Ground
The CANV circuit, also known as the control area network voltage circuit, can become shorted to ground when an electrical fault occurs. When the CANV circuit is shorted to earth, the PCM is unable to control the EVAP canister vent valve duty cycle. Ford drivers must check for any shorts to ground and repair or replace damaged components to resolve this issue.
Conclusion
The Ford Code P0446 is an EVAP System Vent Control Circuit DTC set when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified EVAP canister vent valve duty cycle by PCM command. To diagnose and fix this issue, Ford drivers must inspect the VPWR, KAPWR, and CANV circuits for any open courses or shorts to ground, repair, or replace damaged components. Drivers can effectively diagnose and repair the Ford Code P0446 by following the above solutions.
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