SES Light - 3 codes - P0102, P0443, P0449

blindbatts · 06-08-2007, 10:15 PM

Any ideas what could be wrong?

The SES light came on while I was at an ORV park, after off-roading for about 3 hours.

P0102 - Mass Air Flow Sensor Circuit Low Frequency
P0443 - Evaporative Emission Control System Purge Control Valve Circuit
P0449 - EVAP Canister Vent Solenoid Valve Control Circuit

I checked the vacuum lines under the hood and it appears I have no leaks, I'm going to hook a vacuum gauge up in a minute and see where the vacuum is at idle.

MAF is plugged in, gas cap was removed and re-tightened, I cleared the codes when I read them and they came back after a short drive.

truck is a 2001 4x4 blazer LT, with 106k miles. I replaced the starter 3 weeks ago, put about 800 miles on it since then.

blindbatts · 06-08-2007, 11:20 PM

just drove to blockbuster and back, and checked the vacuum (so it would be fully warmed up)

18" at idle, check at the vacuum distro by the drivers side firewall.

so I don't think there's any vacuum leaks.

one other thing I forgot to mention is I replaced the fuel filter when I replaced the starter.

blindbatts · 06-10-2007, 04:16 PM

any ideas?

I dont want to just replace the sensors with the errors, I was hoping someone had an idea of a problem to look for that would cause these errors to happen...

blindbatts · 08-04-2007, 02:22 AM

I figure I should update this.

the MAF sensor wires had frayed by rubbing against something, which caused a short, and blew a fuse.

I replaced the MAF plug, and replaced the fuse, and the problem is completely cleared up.

apparently the evap solenoids run on the same circuit as the MAF.

06-08-2007, 10:15 PM	#1
blindbatts Registered User Age: 27 Join Date: May 2007 Posts: 33 Location: User is: OffLine	SES Light - 3 codes - P0102, P0443, P0449 Any ideas what could be wrong? The SES light came on while I was at an ORV park, after off-roading for about 3 hours. P0102 - Mass Air Flow Sensor Circuit Low Frequency P0443 - Evaporative Emission Control System Purge Control Valve Circuit P0449 - EVAP Canister Vent Solenoid Valve Control Circuit I checked the vacuum lines under the hood and it appears I have no leaks, I'm going to hook a vacuum gauge up in a minute and see where the vacuum is at idle. MAF is plugged in, gas cap was removed and re-tightened, I cleared the codes when I read them and they came back after a short drive. truck is a 2001 4x4 blazer LT, with 106k miles. I replaced the starter 3 weeks ago, put about 800 miles on it since then. Last edited by blindbatts : 06-08-2007 at 10:16 PM.
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06-08-2007, 11:20 PM	#2
blindbatts Registered User Age: 27 Join Date: May 2007 Posts: 33 Location: User is: OffLine	Re: SES Light - 3 codes - P0102, P0443, P0449 just drove to blockbuster and back, and checked the vacuum (so it would be fully warmed up) 18" at idle, check at the vacuum distro by the drivers side firewall. so I don't think there's any vacuum leaks. one other thing I forgot to mention is I replaced the fuel filter when I replaced the starter.
	[Reply w/Quote]

06-10-2007, 04:16 PM	#3
blindbatts Registered User Age: 27 Join Date: May 2007 Posts: 33 Location: User is: OffLine	Re: SES Light - 3 codes - P0102, P0443, P0449 any ideas? I dont want to just replace the sensors with the errors, I was hoping someone had an idea of a problem to look for that would cause these errors to happen...
	[Reply w/Quote]

08-04-2007, 02:22 AM	#4
blindbatts Registered User Age: 27 Join Date: May 2007 Posts: 33 Location: User is: OffLine	Re: SES Light - 3 codes - P0102, P0443, P0449 I figure I should update this. the MAF sensor wires had frayed by rubbing against something, which caused a short, and blew a fuse. I replaced the MAF plug, and replaced the fuse, and the problem is completely cleared up. apparently the evap solenoids run on the same circuit as the MAF.
	[Reply w/Quote]