mytwosons Posted February 7, 2010 Posted February 7, 2010 This morning when i started my 2006 GX Check engine light stays on also the VSC TRAC and VSC OFF. I pulled out the code and it reads P0456 anybody who experienced this kind of problem?
mann777 Posted February 7, 2010 Posted February 7, 2010 Nothing serious, DTC No. DTC Detecting Condition Trouble Area P0442 P0456 After cold engine start. After VSV for EVAP operation, the VSV for EVAP is turned off sealing the vacuum in the system and the ECM begins to monitor the pressure increase. Some increase is normal. A very rapid, sharp increase in pressure indicates a leak in the EVAP system and sets the DTC P0442. This monitoring method is also able to distinguish what is called the small leak detection.(DTC P0456) A pressure rise just above normal indicates a very small hole. Fuel tank cap incorrectly installed Fuel tank cap cracked or damaged Hose or tube cracked, hole, damaged or loose seal ((3) or (9) in Fig. 1) Vacuum hose cracked, holed, blocked, damaged or disconnected ((1), (2), (4), (5), (6), (7), (8), (10)and (11) in Fig. 1) Fuel tank cracked, holed or damaged Charcoal canister cracked, holed or damaged Open or short in vapor pressure sensor circuit VSV for CCV VSV for EVAP VSV for pressure switching valve Vapor pressure sensor Fuel tank over fill check valve cracked or damaged. What you should do is Check your Gas Tank Cap,probably it would be loose while you did last re-fueling. Next go below your car, there is hose from the Fuel Tank which connects the VSV canister, check out the hose clamp and have them re-tightened. Now Disconnect the battery terminal (-) and EFI fuse, to erase the DTC code in the ECM memory. And have them reconnected. That it you are good to go.
mytwosons Posted February 7, 2010 Author Posted February 7, 2010 Thanks! I will keep you updated. Nothing serious, DTC No. DTC Detecting Condition Trouble Area P0442 P0456 After cold engine start. After VSV for EVAP operation, the VSV for EVAP is turned off sealing the vacuum in the system and the ECM begins to monitor the pressure increase. Some increase is normal. A very rapid, sharp increase in pressure indicates a leak in the EVAP system and sets the DTC P0442. This monitoring method is also able to distinguish what is called the small leak detection.(DTC P0456) A pressure rise just above normal indicates a very small hole. Fuel tank cap incorrectly installed Fuel tank cap cracked or damaged Hose or tube cracked, hole, damaged or loose seal ((3) or (9) in Fig. 1) Vacuum hose cracked, holed, blocked, damaged or disconnected ((1), (2), (4), (5), (6), (7), (8), (10)and (11) in Fig. 1) Fuel tank cracked, holed or damaged Charcoal canister cracked, holed or damaged Open or short in vapor pressure sensor circuit VSV for CCV VSV for EVAP VSV for pressure switching valve Vapor pressure sensor Fuel tank over fill check valve cracked or damaged. What you should do is Check your Gas Tank Cap,probably it would be loose while you did last re-fueling. Next go below your car, there is hose from the Fuel Tank which connects the VSV canister, check out the hose clamp and have them re-tightened. Now Disconnect the battery terminal (-) and EFI fuse, to erase the DTC code in the ECM memory. And have them reconnected. That it you are good to go.
mytwosons Posted February 8, 2010 Author Posted February 8, 2010 I followed your instruction tightened gas cap and the hose clamp from the fuel tank that connects to the charcoal canister and it works so far so good after a road test.Thank you very much! Nothing serious, DTC No. DTC Detecting Condition Trouble Area P0442 P0456 After cold engine start. After VSV for EVAP operation, the VSV for EVAP is turned off sealing the vacuum in the system and the ECM begins to monitor the pressure increase. Some increase is normal. A very rapid, sharp increase in pressure indicates a leak in the EVAP system and sets the DTC P0442. This monitoring method is also able to distinguish what is called the small leak detection.(DTC P0456) A pressure rise just above normal indicates a very small hole. Fuel tank cap incorrectly installed Fuel tank cap cracked or damaged Hose or tube cracked, hole, damaged or loose seal ((3) or (9) in Fig. 1) Vacuum hose cracked, holed, blocked, damaged or disconnected ((1), (2), (4), (5), (6), (7), (8), (10)and (11) in Fig. 1) Fuel tank cracked, holed or damaged Charcoal canister cracked, holed or damaged Open or short in vapor pressure sensor circuit VSV for CCV VSV for EVAP VSV for pressure switching valve Vapor pressure sensor Fuel tank over fill check valve cracked or damaged. What you should do is Check your Gas Tank Cap,probably it would be loose while you did last re-fueling. Next go below your car, there is hose from the Fuel Tank which connects the VSV canister, check out the hose clamp and have them re-tightened. Now Disconnect the battery terminal (-) and EFI fuse, to erase the DTC code in the ECM memory. And have them reconnected. That it you are good to go.
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