Question about 2001 GMC Jimmy

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Emissions sensor fuel tank 2001 gmc jimmy

Is there a emissions sensor on the fuel tank on a 2001 gmc jimmy that would or could prevent the computer system from resetting? And if so does the fuel tank need to be dropped to change? Station told this is the reason my computer will not reset after replacing secondary air pump and fuse and driving for over 250 miles. No codes are showing up. The cost to replace this sensor is an additional $250 to the already 500 I have spent. Any help would be greatly appreciated. Thank you

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  • jrdbadger May 18, 2009

    thanks for getting back to me. The first and only code I got was a 0410 code for secondary air intake pump. We replaced the pump and the green 30amp fuse behind the battery and checked to make sure all was working which was told it is. Have driven the car almost 200 miles, but system keeps saying not ready at emissions station. Went back to garage found no codes tripped nor was check engine light on. Mechanic then told me about the sensor on top of fuel tank and said he thought that is what might be preventing reset. Vehicle runs great but can't get past emissions test. Any ideas Thanks

  • Dave  C
    Dave C May 11, 2010

    There is a sensor there and you do have to drop the tank, but it's highly unlikely the sensor is the problem, it is simply indicating a problem in the system.. If your engine light has not come back on, you may have already fixed it but just not completed the correct drive cycle yet. Do you know which code or monitor is the problem?

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I don't think you have anything wrong, I just don't think you have completed the correct drive cycle yet. Some vehicles must be driven in a very specific way before all the monitors will set. Here is the drive cycle that Gm Recommends:

  1. 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 in prior to the cold start or the heated oxygen sensor diagnostic may not run.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. Accelerate. Accelerate at 3/4 throttle until 55-60mph (88-96 km/hr). This will perform the same diagnostics as in step 3.
  7. 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.
  8. Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

Posted on May 18, 2009

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Daves944 I have a preblem with getting my 2001 gmc jimmy to pass emissions due to a code saying the vehicle needs to be put threw a drive cycle. The computer I hooked up to the jimmy says the evap pump isnt ready, I tested the evap pump and its working fine. I followed your instructions on the drive cycle about 7 times and it still isnt working. If you have any suggestions please tell me. Thankyou.

Posted on Nov 21, 2009

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Some mechanics are good at replacing things at random. Why did you got to their shop at the first place? Explain it better, and what is happening now? What's your SUV like before and right now? I'm not familiar with your vehicle but I've never heard of such thing.

Posted on May 18, 2009

  • Teddi B May 18, 2009

    Click on this link to get an idea of how demanding a drive cycle can be. Check your vehicles owners manual to find out if there is any information on the drive cycle.

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I have replaced my mass airflow system just replacedvthe fuel pressure regulator and way to many other parts to remember. there is a code that keeps coming up when i check it at autozone. the code is p0453...


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Fuel goes into 2002 gmc jimmy very slow. could it be fuel sensor? where is this located?


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When filling the vehicle this solenoid called the "canister vent valve" should be open allowing the vapors to reach the carbon canister where these vapors are stored to be burned later.
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