2001 duramax 2500hd 2wheel drive engine light came on code read p0106. engine went to pinging

The best way is with a scan tool, but you can disconnect the negative battery cable For a few minutes ! Do you have a check engine light on ? Even if you clear the codes the light will come back on if there is still a problem !

If the check engine light flashes it could be something vary important you might want to check that before driving it.

NEED VIN - CHASSIS NUMBER OR ENGINE CODE{BWA??}

Have codes read by someone with good scanner that reads trans codes.

code p 0106 refers to manifold absolute pressure (MAP)sensor or barometric pressure (BARO ) sensor---range /performance problem====causes ---intake / exhaust leak---wiring --- MAP pr BARO sensor problems
intake leaks( vacuum leaks)can be purge vent leaks, transmission actuator leaks , dash vent controls vacuum leaks
exhaust could be cracked flex section of the exhaust pipe at the manifold

Lots of good reading here:
http://www.gm-diesel.com/vbull/duramax-diesels/22659-diagnostic-code-p0093-need-help.html

The air filter is located under the hood, passenger side, up by the windshield. it has a small retangular cover about 3 X 10 that pulls off

You may have disconnected / or moved a broken wire to the ABS wheel sensor during the brake job. Also taking the brake fluid cap off and checking the fluid level, and just reseating the cap may turn off the code. Check these things first, check the wires to the wheel sensors check the fluid in the reservoir, reservoir top fit, and any wires / plugs at the brake ABS master cylinder. If all else fails have some one read the code.

check the codes likely it might need a sensor

They have the same problems. What code are you getting? I may be able to point you in a better direction.