P0499 p0455

[Michael1234567]

What can those codes be i have 05 gmc jimmy how to fix

[jmczzz]

you may can find them searching on line I found some before.

[Motor City Rick]

For Code P0499 start in order with:

• Properly installing the fuel cap.
• Replacing a faulty purge control solenoid or valve
• Replacing a faulty EVAP canister vent valve.
• Clearing a clogged charcoal canister.
• Replacing a broken charcoal canister
• Repairing or replacing cracked or broken vacuum or fuel vapor hoses.
• Replacing a faulty pressure sensor.
• Replacing blown fuses. This repair may indicate that there is a larger issue that must be addressed and repaired.

 

For Code P0455 start in order with:

 

• Missing or loose fuel cap
• Incorrect fuel filler cap used
• Fuel filler cap remains open or fails to close
• Foreign matter caught in fuel filler cap
• EVAP canister or fuel tank leaks
• EVAP system hose leaking
• Fuel tank leaking

With all the history on EVAP issues, look very closely at the gas cap first, make sure you "ratchet" or "click the gas cap clockwise" a couple of times, then clear the codes. Drive and see what code comes back, if any.