What Does P1446 Mean?
The EVAP system is detecting fuel vapor flow when the purge function should be inactive in Oldsmobile vehicles. This indicates a breach in the system allowing uncontrolled vapor migration.
Common Causes
40%
Leaking or stuck open purge control valve
30%
Cracked, split, or disconnected EVAP vacuum lines
15%
Faulty EVAP vent solenoid allowing improper venting
10%
Loose or damaged gas cap allowing pressure loss
5%
Perforated or damaged EVAP canister
Diagnostic Steps
1
Step 1: Inspect and tighten gas cap, check cap seal for damage or deterioration
2
Step 2: Visually trace all EVAP lines from canister to intake manifold checking for damage
3
Step 3: Monitor fuel tank pressure with scan tool during idle (non-purge condition)
4
Step 4: Remove and test purge valve by applying vacuum and verifying it holds when de-energized
5
Step 5: Perform smoke test on EVAP system to locate leaks if visual inspection is inconclusive
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
The EVAP system is detecting fuel vapor flow when the purge function should be inactive in Oldsmobile vehicles. This indicates a breach in the system allowing uncontrolled vapor migration.
The most common cause of P1446 (Evaporative Emission (EVAP) System Flow During Non-Purge Oldsmobile Only) is: Leaking or stuck open purge control valve
Typical repair costs for P1446 range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but will fail emissions testing. May notice fuel smell around vehicle and increased environmental pollution from vapor release.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1446 to identify the root cause.
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Quick Info
Category
Powertrain
System
Evaporative Emissions System
Difficulty
Type
Manufacturer
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