Skip the auto shop - Our mechanics make house calls

Q: Transmission?

asked by on

The car drives fine no problems that I could hear but as I'm driving my check engine light would come on when my gear didnt want to shift into 3rd.
My car has an automatic transmission.

A: Hello. Thanks for your question about your ...

Hello. Thanks for your question about your Check Engine Light (CEL) illuminating for what appears to be a transmission issue. There are both electronic and hydraulic controls in your transmission that control shifting. The electronic controls use sensor inputs and the hydraulic components rely on valves (in the transmission valve body), pistons, and the pressure of the transmission fluid to control shifting. If the shift(s) are not smooth, are delayed, or just don’t occur, there could be an issue with these "controls" or there could be a mechanical issue such as a failed part, such as an internal piston.

A certified technician from YourMechanic would use a hand-held diagnostic tool to retrieve the Codes that were saved when the CEL turned on. The codes will identify the component(s) or system that should be tested. Although the codes don’t necessarily identify the exact failure (or part), they will get the Mechanic close enough to do the testing on the right components which most likely are causing the problem. A Check Engine Light diagnostic can be scheduled at your convenience, at yor home, office, or elsewhere, and once the diagnosis is complete the Mechanic would be able to identify for you the needed repairs and the cost.

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!

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: Overheating - 1995 Honda Accord

Hey there. This can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know the [coolant fan switch] https://www.yourmechanic.com/services/cooling-fan-relay-replacement helps to maintain the proper coolant...

Q: How to replace the timing belt and camshaft

Ideally, you should have aligned the marks before you removed the timing belt. It sounds as though everything is completely disassembled already. This makes things a bit more difficult. I would only recommend assembling it the same way as you...

Q: Can you drive a car with a bad throttle body?

From your post I presume that you have checked the codes and got a throttle body code. The car may still seem to be okay and you want to know if it is safe to drive. The answer is: probably....

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
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.