p0452...not the first time
Thread Starter
JK Enthusiast
Joined: Apr 2007
Posts: 147
Likes: 0
From: Edmonton, Alberta
p0452...not the first time
4 years ago i ripped off my evap canister, drove through a river of muddy water and sucked it into my gas tank. I had to replace the canister, pump, sending unit, and tank. I was trouble free for a few years until i got the p0452 code again. I checked over the canister for cracks, and decided to give in a pay for the dealer to figure it out. A few hundred dollars later, the tech tells me that the lines were dirty going from the tank to this small valve in the engine bay infront of the battery. (can't find reciept, don't remember what its called) He said he did his best to clean out the line and replaced the valve. I was trouble free for another year or so before p0452 showed up again. This time i figured i'd change out the valve myself, i did, and i got another 6 months trouble free. This time i figured i had it all sorted, replace the $20 valve and be on my way. This time however it only went away for a week, and while i can clear the code with my code reader it comes back on right away. I also tried reseting the battery, but it comes right back again.
So i'm looking for suggestions on what to check or replace. I figure i can replace half the parts involved for the same price the dealer will charge to diagnose the problem. That is if they would be any help at all. Thanks.
So i'm looking for suggestions on what to check or replace. I figure i can replace half the parts involved for the same price the dealer will charge to diagnose the problem. That is if they would be any help at all. Thanks.
JK Jedi Master
Joined: Feb 2008
Posts: 12,907
Likes: 185
From: Maine
P0452-EVAP PRESSURE SWITCH STUCK CLOSED
Possible Causes
EVAP PURGE HOSE/TUBE AND FRESH AIR FILTER OBSTRUCTION
EVAP PURGE CONTROL CIRCUIT SHORTED TO GROUND
ESM SIGNAL CIRCUIT SHORTED TO GROUND
ESM SWITCH
EVAP PURGE SOLENOID
POWERTRAIN CONTROL MODULE (PCM)
- When Monitored: Immediately after the ignition has been turned off.
- Set Condition: At key off, the PCM energizes the Purge Solenoid for a calibrated amount of time (30 seconds maximum) and stores the state of the ESIM switch. The state is evaluated again at the next key on. If the PCM does not detect that the ESIM switch is open, an error is detected. Two Trip Fault. Three good trips to turn off the MIL.
Possible Causes
EVAP PURGE HOSE/TUBE AND FRESH AIR FILTER OBSTRUCTION
EVAP PURGE CONTROL CIRCUIT SHORTED TO GROUND
ESM SIGNAL CIRCUIT SHORTED TO GROUND
ESM SWITCH
EVAP PURGE SOLENOID
POWERTRAIN CONTROL MODULE (PCM)