Question about 2003 Pontiac Bonneville
Evaporative emissions, i.e. gasoline fumes. The fumes in the fuel system are collected in a canister and are then purged during normal driving to be burned by the engine. The ECM (electronic control module) checks the evap system each time the key is turned on. If the system fails the test enough times, the ECM will set a code and turn the SES light on. Possible causes: Damage to the canister, purge lines or valve, but most commonly it's a loose fuel tank cap. Buy a new cap, make sure it's tight after each refueling and if that was the problem, the SES will eventually turn off. You could also take the quick route and just clear the code after replacing the fuel tank cap.
Posted on Mar 19, 2011
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Posted on Jan 02, 2017
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