Q: Check Engine Light is on - code P0455

asked by on November 01, 2016

My car had check engine light on and it was code P0455. I had the fuel pressure regulator and the purge valve replaced. I also replaced the fuel cap three times. Two days after the repairs the engine light came back. Now that it has been nearly a month after the repairs, the engine light turned off by itself as I was driving in the highway. My question is does it take time for the car computer to detect the new replaced parts? Is the problem still there even if the light is off or was there no problem with my car after all? I checked under the car many times, there is no fuel smell, no damaged hoses or fuel line, the canister is in great condition. By the way, one day as I was in a red light, the car RPM went down and the car turned off, but restarted with no problem. Does this has anything to do with code P0455.

My car has 82212 miles.
My car has an automatic transmission.

Hello. P0455 is the trouble code for a large leak detected by the evaporative emissions control system. The computer will set off this code if it detects a large leak in the evaporative emissions (EVAP) system. The EVAP emissions system is an emission system found on most modern vehicles. It’s purpose is to reduce the vehicle’s fuel vapor emissions by collecting them for ingestion by the engine. The system uses a serious of sensors and valves to monitor, collect, and purge the fuel vapors, reducing overall emissions levels.

In regards to time having to pass for the computer to detect repairs, yes, in some cases the vehicle will have to be driven for a few cycles before the computer detects that the issue is gone. If the repairs were made and the light has turned off on it’s own, then it is likely that the issues are resolved. If they were not, the light would not turn off or would come on again. In regards to your stalling issue, in most cases an EVAP code will not cause stalling. Usually, stalling is caused by a fuel or engine management issue.

If the stalling persists, I would have a professional technician, such as one from YourMechanic, come to your location to determine why the car is stalling and make any repairs necessary to get your car back in working order.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Car idles and stalls; scan shows P0137

This engine has had many technical bulletins for stalling or idling rough and most called for the engine control module (ECM) to be reprogrammed. I recommend having the engine scanned to check for any codes, the engine checked for...

Was in a rear-end collision that affected my brakes. Mechanic says master cylinder is the issue. Could this be do to the wreck

To determine if crash forces led to master cylinder failure you would have to determine exactly "what" failed within the master cylinder. If the master cylinder bore is scored or worn, for example, thus causing significant output pressure loss, that...

Changed front brake pads. After 2 weeks the brakes make a grinding noise at low speeds.

Hi there. In some cases if the brake pads are not correctly aligned upon installation, they can cause this type of grinding noise. It's also common if the calipers or rotors are too tight for the rotor to warp, which...

Related articles

P2123 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch D Circuit High Input
P2123 P2123 Code Definition Throttle/Pedal Position Sensor/Switch D Circuit High Input What the P2123 code means The P2123 trouble code indicates that the Engine Control Module (ECM), which is in charge of receiving a signal from the throttle position...
P2036 OBD-II Trouble Code: Exhaust Gas Temp Sensor Circuit High (Bank 2 Sensor 2)
P2036 P2036 Code Definition Exhaust Gas Temp Sensor Circuit High (Bank 2 Sensor 2) What the P2036 code means The P2036 trouble code indicates that the Engine Control Module (ECM) has detected a malfunction in the exhaust gas temperature (EGT)...
P2400 OBD-II Trouble Code: EVAP Leak Detection Pump Control Circuit/Open
P2400 P2400 code definition EVAP Leak Detection Pump Control Circuit/Open What the P2400 code means Trouble code P2400 is set when the Engine Control Module (ECM) detects a problem on the circuit that controls the evaporative emissions (EVAP) leak detection...