Flashed or Not Flashed, That’s the Question

The CVN’s listed on the website should match CVN’s on your scan tool. If all the CVN’s match a GM cal was installed. If any CVN fails to match, an aftermarket calibration was most likely installed.

not the forward and/or back buttons on your internet explorer, this will cause an error message. At the next screen you will be able

to select the type of calibration infor- mation you’re looking for. A recom- mend choice would be to click on the box marked “complete history”. This will give you access to all the calibra- tions for the various modules then click the next (figure 5). The website will now display your

calibration ID as a “part number” (fig- ure 6 & 7). The part number is typically listed as “CAL ID” on your scan tool. The part numbers from the website can then be compared to the CAL ID number on your scan tool to determine if your software is current. The website also includes the CVN

with the part number. On your scan tool you will typically find the CVN with the CAL ID information. Many scanners include both the CVN and the CAL ID as a part of their data list parameters. Some scanners do not and you will need to choose the “OBD II GENERIC” feature and then select the “MODE 9” function to access the information. The CVN’s listed on the website

should match CVN’s on your scan tool. If all the CVN’s match a GM cal was installed. If any CVN fails to match, an aftermarket calibration was most likely installed.

Figure 7

12 GEARS May/June 2010

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