I have a 2000 tahoe. My scanner reads code P113, what is that?

The code P2196 indicates that there is too much fuel in relation to the oxygen in your vehicle, or that the oxygen sensor is faulty and reading an incorrect air/fuel ratio, thats your engine is running rough.
Engine code P0113 could be caused by a number of things, including a bad sensor or faulty wiring.
This trouble code points to the oxygen sensor, it's natural to want to replace it and move on. However, you must first inspect the wiring and the sensor to ensure.

Change all your sensors over from old motor.

Code 446

P0446 Chevrolet Description
The Powertrain Control Module (PCM) monitors the performance of the Evaporative Emission (EVAP) system by applying a predetermined level of vacuum to the EVAP system then monitors the vacuum decay rate.
Possible causes =
- Plugged vapor canister
- Faulty vent solenoid
- Pinched or blocked EVAP hose
- Faulty FTP sensor

Read more: http://engine-codes.com/p0446_chevrolet.html#ixzz3C6NJ1IpZ

When you say it fires, are you checking for spark at the plugs ?
In most cases you have to figure out if it is spark, fuel, or compression to proceed. A mechanic would also check the computer for trouble codes but you would need a scanner or code reader to do that.

Fuel, spark or sensor. You need to get a scanner on it and read the codes. Could be many different things.

My P0102, P113 codes turned out to be the connector to the mass air flow sensor - wasn't all the way on.

Most auto parts stores have Scanners that can read the actual Codes causing the check engine light- usually for FREE. Google the Codes to determine what needs fixed.

Do not continue to drive it, as it may cause permanent damage!

GL,
Td

Vehicle sounds like it has rear back-up sensors, one or all may have failed. Will have to scan for the codes, a dealer scanner may be the only way to read those codes.

If the cap is tight then it will have to be diagnosed further. If the cap was loose then tighten it and clear the codes.It will go off on it's own but it will take a while

YOU MAY NEED TO CHANGE YOUR SPARKPLUGS AND PUT NEW ONES IN IT.