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Check engine code p0442
1999 Chevrolet 1500 Pickup

Check engine code P0442

(1999 Chevrolet C1500)
I replace the fuel pump, gas cap, evap canister vent solenoid, evap purge solenoid valve, evap canister, fuel tank pressure sensor, fuel tank gasket. mechanic perform smoke test & other test has been checked. The check engine still comes on when driven.
What seems to make the problem better or worse? No symptoms it's just comes on at random times
How long have you had this problem? 3 months
Tags: no problems or change in, chevrolet, 1500 pickup
1 answer & 1 comment
Popular Answer
on January 13, 2018
ALL we can do here is offer a guess ! ... Some *aftermarket* gas caps are inadequate .. Smoke vapor test should find any leaks - IF performed correctly ... Professional scan tool to perform EVAP functional test and view live data is a must.

Good luck!
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on January 13, 2018
IF it becomes absolutely necessary - bed removal may be required to aid smoke test search for fuel pump module o-ring seal leak and connections on top of tank.

At times a small leak can be very difficult to locate - it just takes time and patience.
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on January 13, 2018
ALL we can do here is offer a guess ! ... Some *aftermarket* gas caps are inadequate .. Smoke vapor test should find any leaks - IF performed correctly ... Professional scan tool to perform EVAP functional test and view live data is a must.

Good luck!
Sign in to reply
on January 13, 2018
IF it becomes absolutely necessary - bed removal may be required to aid smoke test search for fuel pump module o-ring seal leak and connections on top of tank.

At times a small leak can be very difficult to locate - it just takes time and patience.

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