P0446 code?!?! 😡😡😡 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ViatminC10 · 06-23-2023, 10:05 AM

Anyone with 04 GMC Sierra pick up truck have trouble with the eve app system? I’ve had my truck in two different shops spent about $1500 and replace just about every part on the Evap system except for the computer ECM.
Every time the shop replaces a part the check engine light stays off for a month or so and then comes back on. The last time the light stayed off for after about 250 miles and then came back on.
Last time in shop they “flashed the ECM”
I was told that the next time it comes back on it probably needs a new ECM. Do these trucks have a history of bad ECM’s?

Any help appreciated?

06-23-2023, 10:05 AM	#1
ViatminC10 Registered User Join Date: Jan 2021 Location: ft worth texas Posts: 37	P0446 code?!?! 😡😡😡 Anyone with 04 GMC Sierra pick up truck have trouble with the eve app system? I’ve had my truck in two different shops spent about $1500 and replace just about every part on the Evap system except for the computer ECM. Every time the shop replaces a part the check engine light stays off for a month or so and then comes back on. The last time the light stayed off for after about 250 miles and then came back on. Last time in shop they “flashed the ECM” I was told that the next time it comes back on it probably needs a new ECM. Do these trucks have a history of bad ECM’s? Any help appreciated?



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