Q: Diagnose torque converter selenoid or transmission

asked by on

have an 06 avalanche 1500 ls 2wd 5.3 automatic that will drive fine for 30 mins then suddenly lose acceleration rpms still move but wont increase speed on road but once it cools down half n hr or so it will drive fine again no clicks or noise no shifting problems and it is not producing any codes at autozone the transmission is only 3yrs old fluid is full but has a hint of dirt to it but not burnt black or metal still red and full no leaks im not sure where to start diy cant afford to have shop repair can u give me ways to test if its the tranny torque converter or selenoid or any other ideas on diagnosis would be helpful please

My car has 200000 miles.
My car has an automatic transmission.

Hi there. The computer could be putting the vehicle into limp mode due to an issue that may be happening and reduces the engine performance. Check the battery, alternator, and all of the sensors on the engine and make sure that they are all working properly. If the engine is running normally, then there could be an issue with the transmission.

To check the transmission torque converter complete the following steps:

(1): Set the parking brake and start the engine. (2): Press down on the service brake and hold it on the floor (3): Put the transmission selector in the ’D’ (drive) position (4): Press down on the accelerator pedal to the floor for 3 to 5 seconds (5): While the engine rpm is high, monitor how high the rpm goes with the accelerator pedal on the floor (6): Let off the accelerator pedal and put the transmission in park (7): Shut off the engine and then release the service brake and parking brake

Make sure that when you perform this test, have your vehicle in a location where there is nothing in front of the vehicle to prevent any damage to your vehicle if for some reason the brakes fail during the test. It is best to add a pair of chocks to the wheels for added safety. If you need further assistance with your vehicle stalling for no reason after 30 minutes of driving, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Diagnose torque converter selenoid or transmission

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Shift selenoid "A" electrical P0753

If you did not do so while replacing shift solenoid "A" (if I am reading your query correctly), disconnect the battery for 10 minutes or so, re-connect the battery, and drive the car for 15-20 minutes. This will reset the...

Q: Q: ABS/brake lights on

Typically when a vehicle has the ABS light appear on, the brake light will appear right along with it. When this happens, the next step would be to use a automotive scanner to communicate with the ABS module. This will...

Q: Truck wont accelerate over 20mph. what can it be

Either you have a blocked exhaust like a bad converter, a muffler clogged from a broken up converter, or you have a bad ignition module or fuel pressure problem. First try replacing the fuel filter to see if it is...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.