Need help with diagnostic code P0442
Thread Starter
Cruising
Joined: Dec 2006
Posts: 14
Likes: 0
Need help with diagnostic code P0442
My check engine light came on over the weekend. I ran the codes and came up with one current code.
10-PCM P0442 C
The closest code I could find is P0441 EVAP System No Flow During Purge
What does this mean in english?
Thanks for your help.
10-PCM P0442 C
The closest code I could find is P0441 EVAP System No Flow During Purge
What does this mean in english?
Thanks for your help.
Safety Car
Joined: Jan 2001
Posts: 4,386
Likes: 689
From: Boise ID
Did you put gas in over the weekend. Maybe the cap is not tight or bad. It happens occasionally. Try this link:
http://www.gearchatter.com/viewtopic10457.php
http://www.gearchatter.com/viewtopic10457.php
Tech Contributor
Joined: Oct 1999
Posts: 41,037
Likes: 9,799
From: Charlotte, NC (formerly Endicott, NY)
Check your gas cap as the first thing they do in the diagnostic for this code is check the gas cap. Here is the theory of Op.
DTC P0442
System Description
This DTC tests the evaporative emission (EVAP) system for a small leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the vacuum decay rate. At an appropriate time, the control module turns the EVAP canister purge valve ON and the EVAP vent valve ON. This allows the engine to draw a vacuum on the EVAP system. At a calibrated time, or vacuum level, the control module turns the EVAP canister purge valve OFF, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum decay. If the control module detects a leak larger than a calibrated amount, this DTC sets.
Bill
DTC P0442
System Description
This DTC tests the evaporative emission (EVAP) system for a small leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the vacuum decay rate. At an appropriate time, the control module turns the EVAP canister purge valve ON and the EVAP vent valve ON. This allows the engine to draw a vacuum on the EVAP system. At a calibrated time, or vacuum level, the control module turns the EVAP canister purge valve OFF, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum decay. If the control module detects a leak larger than a calibrated amount, this DTC sets.
Bill
