Q: Car will not shift into fourth gear - 1991 Mercedes-Benz 300SE

asked by on

My car has a mileage of 160,000 miles. It generally runs well. However, when it gets warmed up or when the outside temperatures are high, the car seems to develop shifting problems. The issue is specifically shifting into fourth gear. What could be the cause of this?

Hello. I would check the condition of the transmission fluid first as well as the level. If the fluid is old or low then this will occur. If the fluid smells burnt or has debris in it then the transmission would need to be rebuilt. Most of the time this is caused by the valve body failing which results in the valves to bind internally. You will need to take the vehicle to a transmission specialist to diagnose this.

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. Car will not shift into fourth gear - 1991 Mercedes-Benz 300SE

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: Clutch problem 1991 Acura Integra

Hi there - if in fact your transmission is still locked in gear, this would be the correct behavior. If the shifter linkage has failed with the transmission still in gear; or the clutch is dragging or the pilot bearing...

Q: Car will drive in Reverse but not Forward.

Hello, the automatic transmission has 3 systems; electronic, hydraulic, and mechanical. What you described could be an internal mechanical failure with transmission. The electrical system which includes the module, will go into a default mode if there is a failure...

Q: Hard shifting between lower gears

Hey there, thanks for writing in about your 2000 Saturn LS2. This sounds like a common symptom of a transmission valve body not working correctly. The valve body of a transmission directs traffic when it comes to hydraulic fluid in...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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.