Reprogram pcm 2001 tahoe 5.3 - 1999 Chevrolet Tahoe

TPS leak - check the servo assembly or the 1-2 accumulator
Also check the TPS for smooth linear response over entire range of motion
Shift A & B solenoids and wiring issues ,as I stated above
Wiring from PCM to Trans and Trans back to PCM
Make sure 02 sensors wiring is NOT touching exhaust
Clogged valves
TCC Solenoid also check wiring.

2001 Chevy Tahoe Heat Problem - Tahoe Forum

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Dec 5, 2008 - 10 posts - ‎7 authors 2001 Tahoe, the front heater blows a little hot air when the car warms up and then blows cold air. The rear heat seems to work fine. I changed ...

Rear AC blows hot air - Tahoe Forum - Chevy Tahoe Forum

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Jul 14, 2008 - 10 posts - ‎5 authors
On my wifes 03' Yukon the rear air conditioning blows hot air no .... Pull the panel off and look at the hot/cold actuator shown in the picture.

only a service dealer can reprogram the PCM to your keys or your keys to the PCM they need both units connected up to the code programmer to do this.

A doozy! And common to Chrysler Dodge products. The code means the computer detected an internal fault in the PCM. There have been many reported failures of the Program Control Module in Chrysler products.
However, if you took off the connector to the PCM while battery was connected, you may have set the code yourself.
It's pretty much a dealer fix: In most cases, the fix is to replace and reprogram the PCM. In a few instances, the dealer may be able to reflash the PCM and get it working again, but usually it needs replacing and reprogramming. It's probably not, but ask if it's still under emissions warranty.
If you use an independent shop to replace the PCM, make sure they can also program it. Good luck.

A code P0601 in most cases means the PCM has gone bad. This is possibly due to a short-circuit inside the PCM. Or, if you disconnect the wires/connector from the PCM while the battery is still connected, that may also cause this code.
Possible Solutions

With a P0601 OBD-II trouble code, the most common fix is to replace and reprogram the PCM. In a few cases the dealer may be able to reflash the PCM and get it working. But more than likely the PCM will need to be replaced and reprogrammed (we recommend you take it to a dealership for this). The good news is it *may* be covered under your emmissions warranty. So even if you're out of bumper-to-bumper warranty or powertrain warranty, check your warranty guide or dealer to see if this is covered.

Other people have reported that they cleared the code only for it to return again and again. Keep in mind that most shops can replace the PCM but not all can program it.

Hope thie helps.

{: ) Anytime the powertrain control module (PCM) or the battery is disconnected, the PCM loses power, or the PCM is reprogrammed, the PCMs learned idle position is lost. The engine idle is unstable when the learned idle position is lost. For a 2001 Yukon XL, you can try these steps: Automatic Transmission

1. Turn OFF the ignition.
2. Restore the PCM battery feed. ( IF it was disconnected)
3. Turn OFF the A/C controls.
4. Set the parking brake and block the drive wheels.
5. Start the engine.
6. Ensure that the engine coolant temperature is more than 80°C (176°F).
7. Shift the transmission into Drive.
8. Allow the engine to idle for 5 minutes.
9. Shift the transmission into Park.
10. Allow the engine to idle for 5 minutes.
11. Turn OFF the engine for 30 seconds.

Manual Transmission

1. Turn OFF the ignition.
2. Restore the PCM battery feed. (IF it was disconnected)
3. Turn OFF the A/C controls.
4. Set the parking brake and block the drive wheels.
5. Place the transmission in Neutral.
6. Start the engine.
7. Ensure that the engine coolant temperature is more than 80°C (176°F).
8. Allow the engine to idle for 5 minutes.
9. Turn OFF the engine for 30 seconds.

After the procedure, you can do testing and observations. If unsuccessful, you may repeat the steps.
Also, the best time to relearn idle is after a throttle body clean (from carbon deposits)

Hello kleb311,

It's in the engine compartment by the battery.

Regards,
netvan

The computer on that vehicle is a Power Train Control Module. Or PCM.
The PCM requires a reprogramming procedure that is specific to your vehicle, as the vehicle identification number is also electronicly stored. Some GM dealers have an "off board programmer" that allows them to reprogram the PCM at the parts counter, however most shops will require the vehicle to be brought in also.

you will have to go to the dealership and thats if they will let you have it. They are fairly inexpensive to get and instructions for reprogramming are plastered accross the internet.

Check into replacing it, it may be cheaper on parts and your time.

take it to the dealer and have them reprogram the pcm to latest calibration.