2010 Pontiac EVAP leak detected smoke test show no leak

Question

I had my purge valve replaced, and a new gas cap put on. The check engine light was still on. Mechanic said could be canster/do a smoke test. I had that done today. They could not find the leak, and tried a few times. My check engine light is off now, but I'm sure it will be back on. Any other ideas other than the smoke test?

Answer 1

This code condition can be from a false report from the FTP (fuel tank pressure) sensor , This is known cause for a EVAP code.