Tip & How-To about Chevrolet Silverado 1500

Vehicle Inspection required drive cycles.

If your state requires periodic emmissions inspections, you may run into a problem when your vehicle has not gone through the required drive cycles after a repair, or anytime the computer was cleared. The inspection station will not pass your vehicle until the required drive cycles has been met. But nobody knows what is required of you in order to meet the criteria for drive cycles. I ran across theis website that explains the drive cycle process, and other information concerning the OBD2 diagnostic sysytem. The website is www.obdII.com.

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I have a 2004 pontiac bonneville the catalytic turning red hot how can I fix this


Go to Midas,they will check out for free,I get them to do work on my vehicles,exhaust,a.c,brakes and shocks,good prices,great work,and a guarantee.

Sep 21, 2013 | Cars & Trucks

2 Answers

I put a new battery on my 2008 Chevy Equinox. I took it to get the inspection done and I was told that there has to be so many miles on my new battery before it passes inspection. I was told to drive 60 miles before the computer would be able to read it. Well I have driven 500 miles and the computer is still saying it is "not ready" so therefore it will not pass inspection until the reading states it is in the "ready" mode. I want to know if anyone else has had this problem and if so how many miles did they drive before it finally passed inspection?


It's not the battery itself that's the issue. When you disconnected the battery to replace it, you cleared all the data from the computer. The computer then runs a self test of all systems to determine that they are functioning properly. There are several systems to be tested, and until they pass the test, each system is classified 'not ready'. Some system tests are done very quickly, with only one 'drive cycle', and they become 'ready'. Some systems require multiple drive cycles, and take longer. For some vehicles, specific criteria have to be met. On my vehicle, before the vapor recovery system can be tested, the fuel tank has to be between 1/4 and 3/4 full.

Some testing stations (depending on state) require all systems to be 'ready'. Some require a specific number to be 'ready', e.g., seven of nine. Find out what the requirements are, and which systems still need to complete testing, then check with a dealer for your make/model to see what is required to complete testing for that (those) systems.

Apr 25, 2017 | Cars & Trucks

1 Answer

just had the truck worked on and tried to go thru Marta inspection and it failed - they said there is a drive cycle that I need to go thru before it will pass - what is the drive cycle


Drive cycles vary by manufacturer. It can be as simple as driving at highways speeds for a certain number of miles, or it can bea number of times the vehicle is started and warmed up, then turned off to cool down. A new car dealership service department may be able to tell you what the drive cycle is for your particular vehicle. Anytime you clear the computer on your vehicle, either by using a scanner, or removing power from the computer, you must go through the designated number of drive cycles to reset the computer diagnostics. It's a lousy system, and the auto industry should be required to conform to some kind of standard for all vehicles, regardless of make and model. But, for now, it's not clear exactly what you need to do to achieve the required drive cycles. If your inspection has expired, keep the documents you received when your vehicle failed the last test, just in case you get pulled over by the police.

Feb 15, 2011 | 2001 GMC Yukon XL

1 Answer

1999 lincoln town car a computer says evaporative emission system leak detedcted a sm leak .. what does this mean


After a certain amount of drive cycles at certain temps & lots of other perameters, the vehicle does a self test to see if the fuel system holds vacuum for a period of time. Depending on how long it holds the vacuum determines if it is ok or leaking fast or slow. Usually it is a rotted line or fuel tank filler neck. You probably will never smell gas fumes or notice any loss of fuel economy. Some states require that you can not have a check engine light on to pass its state inspection.

Jun 11, 2010 | 1999 Lincoln Town Car

1 Answer

2000 Saturn SL2 fails smog due to failure of OBD Self test


Some vehicles require very specific drive cycles (called "drive traces" if you perform them on a road simulator or dyno) to activate certain self-checks like the catalyst and EVAP monitors. As a general rule, doing some stop-and-go driving around town at speeds up to about 30 mph followed by five to seven minutes of steady 55 mph highway speed driving will usually set most or all of the monitors. Consequently, if you're checking an OBD II system and discover that one or more of the monitors have not run, it may be necessary to test drive the vehicle to set the remaining monitors.

You should talk to a good emission tec, if this is not throwing a code, it is hard to say if that one of the components could be bad. O2,pump,convert, HeO2, every part of the emission system.

With a 1000 miles, and doing what is says above just before the test, and ending driving at the test
should be plenty. If it is not, you will have to have each emission part checked, or when the computer
is plugged in it might show a code that did not trip dash light.

Mar 27, 2009 | 2000 Saturn SL

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