Signs Of Transmission Solenoid Problems & Its Solutions (Solved)

To control the flow of fluid, the transmission solenoid is an essential component. Due to lack of upkeep and care, this gets worse and shows symptoms due to underlying certain problem.   

Since you are here to find about the signs of transmission solenoid problems, chances are your system is already misbehaving.

Well, here’s a brief overview of the common signs:

  • CEL (Check Engine Light) turns on.
  • Gear shift delays or act weirdly.
  • Stuck gear to N (Neutral) or don’t shift.
  • Car switches into limp mode.

To know what these signs mean and how to fix them, continue to read. I’ll explain all of these below…

4 Signs Of Transmission Solenoid Problems & Its Solutions!

I’m about to share all the solutions based on the signs and explain the reason too. It’ll take on average 20 minutes to fix each issue at a time (not more than 1 hour). Let’s drive into the procedure!

Sign #1: CEL (Check Engine Light) Turns On.

This is the initial sign a faulty transmission solenoid will show. It pops up on the dashboard when the TCM (Transmission Control Module) senses system error with sensors. This cause the CEL to turn on and blink to grab your attention. 


  • Take an OBD II scanner like the ANCEL AD310 Classic that is universal to clear fault codes and connect the plug to the truck. 
  • Turn the scanner on through the power button and access it. 
  • If it automatically scans, waits for 5 – 10 seconds to locate any error code on TCM. Here are some mentions of trouble codes:
    • P0750 – Shift Solenoid A.
    • P0755 – Shift Solenoid B.
    • P0760 – Shift Solenoid C.
    • P0765 – Shift Solenoid D.
    • P0770 – Shift Solenoid E.
  • Match the code and clear the code by pressing ‘Enter’ on the ‘Erase Codes’ option on the scanner. 
  • Wait for some while.
  • Turn on your car and look at the dashboard to ensure CEL doesn’t pop and blink for success.

Sign #2: Gear Shift Delay.

The next sign is a delay to shift gear which also is acting unusually. It’s because the solenoid might have got dusty and trapped with dirt over time. Another reason is the filthy transmission fluid.

Due to these 2 reasons, the solenoid will restrict the pressure of fluid flow to shift from the opening and closing path. That causes the shifting gear to act lately when shifting.


  • Jack up the truck underneath.
  • Detach the drain plug to drain the transmission fluid. 
  • Use a wrench to remove the bolts from the transmission fluid pan.
  • Locate the transmission solenoid valves and remove them. Before doing it, wear safety gloves.
  • Apply moisturizing MAF sensor cleaner like Johnsen’s 4721 on the solenoid valves and outside transmission fluid pan.
  • Attach all the transmission solenoid valves in their place. 
  • Place the fluid pan cover and insert the bolts to tighten them using a wrench.
  • Use transmission fluid to refill the transmission.

Sign #3: Stuck Gear To N (Neutral) Or Don’t Shift.

One of the common symptoms of a problematic transmission solenoid is gear stuck in Neutral and stopping shifting. It happens when the solenoid is stuck AKA closed and not opening while the fluid can’t enter.  


  • Inspect the transmission fluid or oil level. 
  • Start the engine and change the gear to ‘P’ (Park) or ‘R’ (Reverse). Again, change the gear to ‘N’. 
  • Leave the engine running and find the transmission dipstick (yellow loop) in the engine bay in the hood. 
  • Pull out the dipstick and wipe it. Then, replace it.
  • Again, pull it to see the cold and hot marks of the oil level. 
  • Top up the oil level with oil. 
  • Again, check the oil level which should be full not overfilled. 
  • Go inside the truck and change the gear to ‘P’ or ‘R’. Now, it’ll work!

Sign #4: Car Switch Into Limp Mode.

Sometimes for safety purposes, the car can turn to limp mode especially when the transmission solenoid problems occur. Due to this mode, your truck will automatically limit RPMs, Speed, and sometimes stuck gear issues.   


  • Use the OBD II scanner and connect it to the truck.
  • Turn on the truck display and scanner.
  • The scanner will run to automatically scan for error codes. Wait for 5 seconds.
  • After locating the error codes, erase the fault codes and press ‘Enter’.
  • Wait for around 1 to 2 minutes to complete the task.

Frequently Asked Questions

1. How many solenoids are in a transmission?

You’ll find 2 – 3 or more solenoids in the transmission based on your truck requirement. These are shift solenoid, lockup solenoid, and control solenoid.  

2. How much does transmission solenoid repair cost?

Usually, it might cost you around $250 – $550 to repair the transmission solenoid (single one). However, you might need to count the tax, labor cost, and other additional fees. It will charge no more than $3,500 based on the issues.

3. Where is the transmission solenoid located?

In most cars, the transmission solenoid is placed inside the valve body (of automatic transmission). To reach this part, you might need to remove the oil pan of transmission and then take out the valve body.

Wrapping Up

Finding and checking all the signs of transmission solenoid problems will help you figure out the right solution to fix things well.

As it is a complex device, it will need strong care once a year and replacement after 2 to 3 years. Trying the above technique will save huge expenses from repair or replacement.

But yeah, you should get help from an expert if the above stuff seems tough to try.

Hope you find this content detailed and like it to get ideas in order to fix issues after matching the signs. Happy Fixing!

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