Yeap.the aftermarket scanners only cover powertrain diagnostics. If you look at any GM service manual.the diagnostics have you plug in a GM Tech 2 for just about any issue. If you work on GM.you must have a Tech 2.

The Tech 2 does use a memory card that can be updated by simply plugging into another Tech 2 that has been updated. 4-5 minute procedure. The Cadillacs DO offer self diagnostics via the cluster. You may want to look into that angle. GM Tech 2.this one is ours.

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Equip cars, trucks & SUVs with Code Reader from AutoZone. Get Yours Today! We know our parts and products. If TechII is so expensive, how come Autozone can pull codes? You need a CAN-bus scan tool to access. Tech II is to AutoZone code reader as Cray. The Tech 2 Pro Optima gives you the same benefits as the Tech 2 pro. Features and Benefits: Authentic General Motors Tech 2 scan tool. Full, dealer-level diagnostics.