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2004 Pontiac Sunfire P0452 Code After Replacing Fuel Tank Pressure Sensor: Fix & Diagnosis Guide

Model: 2004 Pontiac Sunfire Fault Code: P0452 Posted: 2015-07-16 17:28

Hello everyone! I'm new to this forum and apologize if I'm posting in the wrong section or repeating a common question. I'm not a mechanic, but I enjoy DIY repairs and hate being overcharged by dealerships or garages. I have a 2004 Pontiac Sunfire 2.2L engine, and for about two months now, I've been experiencing intermittent P0452 diagnostic trouble codes. After extensive research and multiple calls to service centers, I believe the issue is related to the Fuel Tank Pressure (FTP) sensor. I recently replaced the FTP sensor myself—followed online instructions, drained the fuel tank, reinstalled the new sensor, and completed all connections. The engine started normally with no check engine light on. However, my OBD-II tool still shows P0452 even after startup. My question: Does the Powertrain Control Module (PCM) need to complete a full evaporative emissions monitor cycle (typically during driving) to reset and accept the new sensor data? Or could the P0452 code indicate another underlying issue? Any insights, troubleshooting tips, or recommendations would be greatly appreciated. I'm trying to avoid professional repairs if possible.

Related fault codes
P0452
Comments (2)
Anonymous 2015-07-17 12:15

The PCM must complete an evaporative emissions (EVAP) monitor test—this is typically triggered during a driving cycle. To properly diagnose, check the freeze frame data: what is the actual FTP sensor voltage? Is there 5V at the FTP sensor terminal? What is the signal return value? And does the PCM recognize and read this input correctly? These details are essential for confirming whether the replacement was successful or if another issue exists.

Anonymous 2015-07-18 09:06

Thanks Kev2! The solution worked. After two full days of driving over 100 miles, the check engine light has completely disappeared and no codes are present on my OBD-II tool. I only have a basic OBD-II device that shows codes and system readiness status—no freeze frame data—but since there's no warning light or code now, I'm confident the repair was successful. Thanks again for your helpful advice!