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JOHN aka Eauto
JOHN aka Eauto, The Car Guy
Category: Chevy
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Experience:  ase tech
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2002 Chevy Silverado 1500 HD: OBD..4x4..5.7 liter..the fuel cap

Resolved Question:

OBD code p0452. Where is it located ? in the tank or out side (FTP) on an 2002 Chevy Silverado 1500 HD 4x4 5.7 liter. Could the fuel cap be the problem?
Submitted: 6 years ago.
Category: Chevy
Expert:  JOHN aka Eauto replied 6 years ago.
The fueltankpressure sensor is located on the top of the fuel tank on the fuel pump sending unitgraphic
Customer: replied 6 years ago.
What do you do to test this part or should I just replace it now so the ck. eng. lite goes out to be able to get this truck to pass smog in Ca.
Expert:  JOHN aka Eauto replied 6 years ago.
yoy wouldneed a scanner with live data to watch readings....The sensor is 50 dollars or so and easy to replace. They do fail
Customer: replied 6 years ago.
Is it possible that the fuel cap is the problem? another person said that is the problem.
Expert:  JOHN aka Eauto replied 6 years ago.
no it would not be its genarally the sensor
Customer: replied 6 years ago.
How long will it be in miles or drive cycles till the ck. eng. goes off so I can smog the truck in California.
Expert:  JOHN aka Eauto replied 6 years ago.
the engine light will not go untill the problem is repaired or thelight is shut off
it should be quick if you follow the drive cycle

A complete driving cycle will perform diagnostics on all monitored systems and can usually be completed in less than fifteen minutes.

Performing a GM OBD-II Driving cycle:

  • Cold Start In order to be classified as a cold start the engine coolant temperature must be below 122?F (50?C) and within 11?F (6?C) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.
  • Idle The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.
  • Accelerate Turn off the air conditioner and all the other loads and apply half throttle until 55mph (88km/hr) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
  • Hold Steady Speed Hold a steady speed of 55mph (88km/hr) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
  • Decelerate Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 20 mph (32km/hr). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.
  • Accelerate Accelerate at 3/4 throttle until 55-60mph (88-96 km/hr). This will perform the same diagnostics as in step 3.
  • Hold Steady Speed Hold a steady speed of 55mph (88km/hr) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.
  • Decelerate This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.
Customer: replied 6 years ago.
The truck is not registered, on non op status can I clear out the code with an OBD II .
Expert:  JOHN aka Eauto replied 6 years ago.
yesu can...but the readiness monitors will not set untill a drive cycle is performed
JOHN aka Eauto and 5 other Chevy Specialists are ready to help you
Customer: replied 6 years ago.
Thankyou John,Customer