01 chevy Express shift problems- Codes p0740 p1504 p1810 p01860. What is wrong

codes are OBDll and are available on line free
example P0740 P0740 is a diagnostic trouble code (DTC) for Torque Converter Clutch Circuit Malfunction

https://www.yourmechanic.com/article/p0421-obd-ii-trouble-code-torque-converter-clutch-circuit-malfunction-by-andrew-quinn

https://www.repairsmith.com/estimates/trouble-codes/p0740/

codes are OBDll and are available on line free you have seious transmission problems. Code scanner came with manual with codes in it.
https://obd2-codes.co/
https://www.obdadvisor.com/most-popular-obd2-codes/


https://www.obdadvisor.com/most-popular-obd2-codes/
https://www.yourmechanic.com/article/p0421-obd-ii-trouble-code-torque-converter-clutch-circuit-malfunction-by-andrew-quinn

https://www.yourmechanic.com/article/p0785-obd-ii-trouble-code-shift-timing-solenoid-malfunction-3-2-shift-solenoid-circuit-electrical-by-valerie-johnston

https://www.transmissionrepaircostguide.com/p1860/

https://www.yourmechanic.com/article/p0753-obd-ii-trouble-code-shift-solenoid-a-electrical-1-2-shift-solenoid-circuit-electrical-by-valerie-johnston

https://www.yourmechanic.com/article/p0758-obd-ii-trouble-code-shift-solenoid-b-electrical-2-3-shift-solenoid-circuit-electrical-by-yourmechanic

Are there any DTC's - diagnostic trouble codes ?in the PCM / BCM ? You have third an fourth below 50 mph but above 50 it down shifts to 2nd gear ,is this what your saying or you don't have 3rd or 4th gears at all ? Which engine did yours come with ? 2.2 L or 4.3 L You trans can set several DTC'S an not all will turn on the check engine light .
DTC B2722 (4.3 L) DTC P0218 (2.2 L) DTC P0218 (4.3 L) DTC P0502 (2.2 L) DTC P0502 (4.3 L) DTC P0503 (2.2 L) DTC P0503 (4.3 L) DTC P0705 (2.2 L) DTC P0706 (4.3 L) DTC P0711 (2.2 L) DTC P0711 (4.3 L) DTC P0712 (2.2 L) DTC P0712 (4.3 L) DTC P0713 (2.2 L) DTC P0713 (4.3 L) DTC P0719 (2.2 L) DTC P0719 (4.3 L) DTC P0724 (2.2 L) DTC P0724 (4.3 L) DTC P0740 (2.2 L) DTC P0740 (4.3 L) DTC P0741 (4.3 L) DTC P0742 (2.2 L) DTC P0742 (4.3 L) DTC P0748 (2.2 L) DTC P0748 (4.3 L) DTC P0751 (2.2 L) DTC P0751 (4.3 L) DTC P0752 (4.3 L) DTC P0753 (2.2 L) DTC P0753 (4.3 L) DTC P0756 (2.2 L) DTC P0756 (4.3 L) DTC P0757 (4.3 L) DTC P0758 (2.2 L) DTC P0758 (4.3 L) DTC P0785 (2.2 L) DTC P0785 (4.3 L) DTC P1810 (2.2 L) DTC P1810 (4.3 L) DTC P1860 (2.2 L) DTC P1860 (4.3 L) DTC P1870 (2.2 L) DTC P1870 (4.3 L) DTC P1875 (4.3 L) .
Shift Pattern This category contains the following topics:
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One forward gear only

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Two forward gears only

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Gear missing or slipping

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No upshift or slipping upshift

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No downshifts

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Non-First gear start

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Refer to First Gear Range Only - No Upshift .

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Refer to Third Gear Only .

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Refer to Second/Third Gear Only or First/Fourth Gears Only .

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Refer to Slips in First Gear .

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Refer to Slipping or Harsh 1-2 Shift .

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Refer to No 2-3 Shift or 2-3 Shift Slips, Rough or Hunting .

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Refer to No 3-4 Shift, Slips or Rough 3-4 Shift .

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Refer to No Part Throttle or Delayed Downshifts .

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Refer to Second Gear Start .

Thats a Tfp switch malfunction..replace solenoid and torque converter. That should fix the problem.

CHECK OUT http://www.obd-codes.com/p0700 & P0740 Torque Converter Clutch Circuit Malfunction

p0122 is a throttle position sensor/switch bad.

p1810 is a TFP valve position switch circuit/transmission 4wheel drive low indicator short circuit to battery.


p0410 is a secondary air injection system malfunction.

not sure if this is the answer yet but i have the same problem with the same codes i work at an auto parts store and a few of the techs that are customers have lead me in the direction of changing the ignition switch, i am doing it today will let you know if it solves the problem

TCC is torque converter clutch circuit which helps tranny shift smoother and is in front off tranny.
$250
Random cyl miss. Most likely bad plug wire or faulty coil pack $45
Transmision pressure switch sends info to computer about tranny pressure and the switch controls it. $400

P0740 is TCC circuit malfunction P0753 is shift solenoid A circuit electrical P0758 is shift solenoid B P1406 is EGR pintle position and P01860 is TCC circuit.

Here's the information on your trouble codes (which explains the problem you're having).

P0740 Torque Converter Clutch Circuit Malfunction
P0753 Shift Solenoid A Electrical
P0758 Shift Solenoid B Electrical
P0785 Shift/Timing Solenoid Malfunction
P1860 TCC PWM Solenoid circuit electrical

The good news is that it is an electrical problem rather than a mechanical problem. So, you should be able to get the problem taken care of without removing the transmission. The bad news is, you'll probably have to take it to a tranny shop to get the electrical bug worked out (unless you have the knowledge/equipment to test each of the electronic components of the tranny).

Hope this helps and good luck!