High idle rpm throttle body

check hoses for vacuum leaks also throttle body may need to be cleaned and or throttle body position sensor can be starting to be faulty or may require cleaning with throttle body --the following links show how to clean a throttle body look up the ones that do it in /on vehicle you dont have to remove it from vehicle
How to Clean throttle body GM 3800 throttle Body Tune Up Cable accelerator... Throttle body cleaning and idle relearn procedure

What Colorado do you have ? 2 wheel or 4 wheel drive ? Sport ,sport LS 3.5L , Z71, Z71 LS. etc. what size engine ? an does it have electronic throttle control ? I have factory service info an it is not showing that code .
DTC P0506

Circuit Description

The throttle actuator control (TAC) motor is controlled by the powertrain control module (PCM). The DC motor located in the throttle body drives the throttle plate. In order to decrease idle speed, the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate. If the actual idle RPM does not match the desired idle RPM within a calibrated time, this DTC sets.

DTC Descriptor

This diagnostic procedure supports the following DTC:
DTC P0506 Idle Speed Low
DTC P0507

Circuit Description

The throttle actuator control (TAC) motor is controlled by the powertrain control module (PCM). The DC motor located in the throttle body drives the throttle plate. In order to decrease idle speed, the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate. If the actual idle RPM does not match the desired idle RPM within a calibrated time, this DTC sets.

DTC Descriptor

This diagnostic procedure supports the following DTC:
DTC P0507 Idle Speed High
Cleaning the throttle body mite take care of it !
Cleaning Cleaning An Electronic Throttle Body Safely

Clean the throttle body and if that doesnt work change the idle control sensor

possible causes are:

Dirty throttle body
Electric throttle control actuator incorrectly adjusted/faulty/damaged
Air leak on Intake
Poor electrical connection to the Intake Air Control valve

P0507 KIA Idle Air Control IAC System RPM Higher Than Expected

Hi. I'm pretty sure your air filter need to be replaced, throttle body clean

There could be several issues causing this problem. For one, I assume you meant 2000 rpm, not 20000 as the engine would have expired before reaching that number.

Checking the computer codes on this would be the safe thing to do as the Throttle Position Sensor could have failed or is sending the incorrect information to the ECU. Another possible issue to look for is a failure of the throttle return, if memory serves there should be a spring on the backside of the throttle body. If the spring is broken or missing, this could leave the throttle open enough to increase the rpm. I would also check the throttle body/throttle blade for dirt. Normally a dirty blade results in a decrease of rpm but it might be possible that it is sticking and not closing as it should. There are special throttle body cleaners available - do not use carb or brake cleaner as they could damage the throttle body. Let me know if any of the above helps.

check all your vacuum hoses and the throttle body itself for a vacuum leaks if the hoses replace as nessasary if to check for throttle body get can of carb cleaner and spray around base of throttle body and sides not in it if idle raises you have a vacuum leak goto a good parts store and ask for a rebuild kit don't goto auto zone or advance they don't carry them

check idle speed control make your throttle valves not stuck.check for vacuum leak around the throttle body area look for broke gasket.

Most likely the throttle body gasket (between the throttle body and the intake manifold) is leaking.

You are really onto it! Either the TPS or the cable from the peddle. Do check the cable first. Frankster016