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2004 Chevrolet Silverado P0446 and P0453 Check Engine Codes - Diagnosis and Fix

Model: 2004 Silverado Fault Code: P0446 Posted: 2016-09-01 17:39

I own a 2004 Chevrolet Silverado 4.3L V6 with persistent check engine light triggered by codes P0446 and P0453. I have already replaced the fuel tank pressure sensor and the evaporative vent control solenoid, but the codes persist. This is preventing me from passing my state vehicle inspection. What could be causing these codes to remain active despite component replacements?

Related fault codes
P0446P0453
Comments (1)
Anonymous 2016-09-01 19:52

Refer to this forum's troubleshooting section for detailed causes and solutions related to P0446 and P0453. After replacing the fuel tank pressure sensor and evaporative vent solenoid, the next likely issue is circuit wiring or voltage problems. Focus on diagnosing P0446 first, as it may directly affect the detection of P0453.