Skip the auto shop - Our mechanics make house calls

Q: Around 2000 rpm, car shifts erratically from 4 to 3 gear, code comes up as Bad Shift Solenoid C

asked by on

If I reset CEL and keep truck around 2000 rpm, it shifts and maintains speed fine, however as I go above said rpm the trans drops out of fourth into third, then if I let off the throttle it will shift back to fourth. If I don't let off throttle, the truck stays in third and the CEL comes on, and the code says shift solenoid c is faulty. I replaced the solenoid, filter, and fluid but it still does same thing. It was a good runner until that popped up out of nowhere, what could it be? It's hard to keep those speeds while on the expressway. Please help, thank you!

My car has 179546 miles.
My car has an automatic transmission.

Hi there, thanks for writing in. Based off your details, you could possibly have a problem with the transmission front pump seal that will not let the lock up torque converter go into overdrive, and may set codes for overdrive. The possible code is P0628 or P0741. I recommend having the front pump seal inspected, and if it’s damaged, replace front pump and converter.

If you’d like help with this issue, consider having one of our certified mechanics come to your home or office to inspect and diagnose this issue for you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • Around 2000 rpm, car shifts erratically from 4 to 3 gear, code comes up as Bad Shift Solenoid C

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: My Ford Explorer SERVICE RSC NOW light is on,what should I do?

RSC stands for Roll Stability Control. It is a form of stability control. The RSC works in conjunction with the anti-lock brake system to help regain control of the vehicle if it goes into a spin or slide. The system...

Q: Wrench light and engine light on

Generally, the check engine light comes on when something fairly serious is going on with the vehicle. This can happen for many different reasons such as a faulty mass air flow sensor, a faulty O2 sensor, a bad catalytic converter,...

Q: ,my car has developed avery hard starting problem overtime and i am asking what could have gone wrong?

Hello, thank you for writing in. When it comes to a hard start there are several components which can add to the problem. If you had the starter bench tested, keep in mind these only measure it's ability to spin...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.