Code p0506, p1638, p1626, p332 - 2000 Chevrolet Tahoe

P0306 is a misfire on cylinder #6 P0174 is a lean code for bank 2 ,P0506
https://www.obd-codes.com/p0506

go to a different dealer these are generic obd ll codes that anyone can scan and get information also if they told you that i would ask for supervisor about it because someone is b/sing p0654
P0654 Chevrolet Engine Speed Output Circuit p0171 http://www.obd-codes.com/p0171 p1626 P1626 Chevrolet Theft Deterrent Fuel Enable Signal Not Received any of these code as you can see are available online in repair manuals etc

you need obd scanner to reset and see if comes back- if it does come back with code , post again

Check Engine light Code P0506 Throttle Body Idle Air Control (IAC) System RPM Lower Than Expected, Do not waste your money Solve the problem of code Throtte Body P0506 with three dollars video Part #1 Remove Throttle Body

P1638 Instrument to ECM , CAN (control area network) short circuit failure,this is either the instrument panel at fault or the ECM.Basically its a open wire. between ECM and instrument panel

click on the below links for code details.
P0106

P0121

P0171

P0174

P0335

P0340

P0385

P0442

P0506

P0507

P0601.

all of the above codes seem to have a common cause, they all list a bad ecm (computer) as being a cause, and the last code P0601 points specifically to a bad computer. sorry for the bad news, hope this helps.

code p1626 in the book it says theft deterrent system fuel enable circuit. hope this helps