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Chevy Colorado - diagnostic says "PO455 Evap Emission Control System Leak" Not sure where to look or fix

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  • greg Oct 05, 2012

    how to clear the codes

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Code P0455 means there is a vapor leak in the fuel system, this could be a bad vent valve, a abd purge valve, a charcoal cansistor, gas cap or even one of the lines. this requires a scan tool and a smoke machine to find the leak. but in most cases it is just a gas cap. take off the gas cap and look at the rubber seal, if the seal has small cracks, or the rubber seals looks like it is worn. try replacing the gas cap and clear codes and see what happens

Posted on Apr 06, 2011

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Posted on Jan 02, 2017

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I HAVE 2005 CHEVY EQUONIX CHECK ENGINE LIGHT ON HAS CODE-PO455 & PO496 (HELP)


P0455- Evap Emission Ctrl Sys Gross Leak Detected
P0496 Evaporative Emission Sys High Purge Flow
This is the 2 codes you requested and they say you have a leak in the emission sys.

Apr 19, 2017 | Cars & Trucks

1 Answer

Pulled a po455 code


jeep uses whats called a leak detection pump that is the most common failure in the system that i have seen in the last five yeas

Jul 07, 2012 | Jeep Grand Cherokee Cars & Trucks

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What can i do po455 code


P0455 CHEVROLET - Evaporative Emission Control System Leak Detected Gross Leak3xicon.jpghttp://engine-codes.com/p0455_chevrolet.htmlForum CodePossible causes- 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

Jun 24, 2012 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Diagnostic codes PO442, PO305 and PO455 comes up on the computer. What do these codes mean?


P0305....Cylinder 5 Misfire Detected


P0442....Evaporative Emission Control System Leak Detected (small leak)


P0455....Evaporative Emission Control System Leak Detected (gross leak)

Feb 11, 2011 | 2001 Dodge Caravan

2 Answers

Emission test coe PO455


The missing ABS fuse will not set this code as ABS is not part of the emissions system. This code is caused by a leak in the EVAP system. Replacing the fuel cap is probably the cheapest solution if you're lucky. Very rarely will the cap be bad. You'll need to check the entire EVAP system for leaks, loose connections, bad hoses etc. The main problem that will trip this code is the EVAP control solenoid. If after checking the system you find no bad hoses or other obvious leaks you'll need to replace the EVAP solenoid.

The solenoid is located under the car behind the fuel tank on the rear cross member. It looks like a little black boc with an electrical connector and two hoses coming from it. Good luck.

Jun 07, 2010 | 2006 Suzuki Forenza

2 Answers

What is he code 455 for a 2006 hyundai sonata means


CODE PO455 EVAPORATIVE EMISSION SYSTEM LARGE LEAK DETECTED.POSSIBLE CAUSES CANISTER VENT SOLENOID MAY BE STUCK IN OPEN POSITION / EVAP CANISTER TUBE EVAP CANISTER PURGE OUTLET TUBE OR EVAP RETURN TUBE DISCONNECTED OR CRACKED OR CANISTER IS DAMAGED / EVAP CANISTER PURGE VALVE STUCK CLOSED OR CANISTER DAMAGED / FUEL FILLER CAP MISSING LOOSE NOT TIGHT OR THE WRONG PART / FUEL VAPOR HOSES TUBES BLOCKED OR RESTRICED OR FUEL VAPOR CONTROL VALVE TUBE OR FUEL VAPOR VENT VALVE ASSEMBLY BLOCKED /FUEL TANK PRESSURE SENSOR HAS FAILED MECHANICAL FAULT /FUEL TANK CONTROL VALVE IS CONTAMINATED DAMAGED OR HAS FAILED.

Oct 21, 2009 | 2006 Hyundai Sonata

1 Answer

Failed Emision test


po442 is evap emission control system leak (small) 1 of the lines for emissions is leaking. po455 is-- emission control system leak (large). turn off light with code scanner after it is fixed.

Sep 01, 2009 | 2001 Dodge Caravan

1 Answer

I had two problems posted for my Ford Explorer 1998 P1400 Differential Press Feedback EGR Circuit low input Po455 Mod $10 3/4 EVAP EMISSION CONTROL SYSTEM LEAK (LARGE) How can I fix it and how can I go...


CODE PO455 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED.POSSIBLE CAUSE - CANISTER VENT SOLENOID STUCK OPEN OR.FUEL TANK PRESSURE SENSOR HAS FAILED MECHANICALLY.OR BAD FUEL CAP. CODE PO1400 -DIFFERENTIAL PRESSURE FEED BACK EGR SENSOR CIRCUIT LOW VOLTAGE DETECTED.POSSIBLE CAUSE -DPF EGR SIGNAL CIRCUIT SHORTED TO GROUND OR DPF EGR SIGNAL VREF CIRCUIT OPEN OR DPF EGR SENSOR IS DAMAGED OR HAS FAILED.I WOULD HAVE GARAGE OR DEALERSHIP TO USE THEIR DIAGNOSTIC EQUIPMENT TO CHECK OUT YOUR EMISSION CONTROL SYSTEM.AND EGR VALVE BECAUSE PARTS IS TOO EXPENSIVE TO BUY.IF YOU DONT NEED THEM.SEE YOU CAN REPLACE THE DPF EGR SENSOR AND THE CANISTER VENT SOLENOID.BUT IT COULD BE A LEAKING GAS CAP OR SOMETHING ELSE.SO LET GARAGE CHECK IT OUT.TO BE ON SAFE SIDE.NOW YOU CAN BUY THOSE 2 SENSORS AND IT COULD FIX YOUR RIDE.I KNOW MONEY IS TIGHT ECONOMY IS IN BAD SHAPE.

Aug 26, 2009 | Ford Explorer Cars & Trucks

2 Answers

01 sonata gls v6...code po455, po442. what are these and how can I pass emissions test in arizona


If you have an EVAP leak, you will get the following codes:

1. P0442 evap emission control system leak (small).
2. P0455 evap emission control system leak (large).

If these codes come up, you need to trace the leak. The most common place for the systems to leak besides the gas cap is at the service port under the hood, the hoses at the purge solenoid, and the hoses around the fuel tank. Check all your EVAP hoses from under the hood , all the way back to the gas tank. You can repair a split hose easily. Buy some 14.5mm EVAP hose at the auto parts store. Just cut the split or cracked section out and attach the new hose.

I can only say that u must fix the code issue and light to pass state emission test, if u reset the light they will know, the system will tell the tester that the system is not ready, this will cause a fail.

Mar 16, 2009 | 2001 Hyundai Sonata

1 Answer

Po455


PO455 possible cause evaporative emission system (EVAP)
unable to reach calibrated vacum level...check hoses for cracks or leaks

Aug 02, 2008 | 2005 Chevrolet Colorado

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