Transmission?

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.
Experienced mechanics share their insights in answering this question :
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.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

If the check engine light comes on while you are driving your automobile, it`s possible that the transmission is going bad. University Auto Repair advises that the transmission does not have a light of its own so the check engine light is illuminated when the transmission is having problems.
Yes, transmission problems can cause your check engine light to come on. Your automobile`s main computer, the engine control module (ECM), talks with system sensors to make sure everything is okay. If the transmission sensors report a problem, the ECM will turn on the check engine light.
Yes, your vehicle`s automatic transmission does not have a dashboard warning light of its own so the check engine light will turn on if there is a problem. Buckeye Complete Auto Care advises that this is just one indication of transmission trouble.
The check engine light is constantly on: Your vehicle`s onboard diagnostic system has determined something is wrong and needs to be fixed. Although your vehicle may seem to be operating fine, it`s best to bring it in for service as soon as possible to prevent additional issues.
The Transmission Range Sensor tells the PCM the position of the transmission shifter. The PCM uses this information to control which gears of the transmission to enable or disable. When the TR sensor fails it can cause wrong gear starts, no upshifts, or what feels like a falling-out-of-gear condition.
1. At the top of all auto repair experts lists for causes of problematic transmissions is low transmission fluid. Usually caused by a leak somewhere in the system, low or contaminated fluid makes it nearly impossible for the transmission to automatically shift gears and run smoothly.
If your transmission fluid gets low enough, the check engine light could pop on. It`s important to have this checked out to make sure it doesn`t result in any serious damage.
One reason why an automatic transmission isn`t shifting into gear has to do with the fluid. If it`s not at the right level or the incorrect type has been used, then it`ll affect the gears. Another big reason has to do with the ECM possibly going bad.
1994 Honda ACCORD (2.2L 4 -cyl Engine Code F22B1 VTEC H) Motor Oil, Filters and Lubricants – AMSOIL.
All the problems that could trigger a check engine light are serious. If the check engine light comes on, it`s one dashboard light you should not ignore. Whether for a week, a month, or a year, if you ignore the check engine light, it puts your vehicle, and by extension, your personal safety at risk.
A loose gas cap is one of the most common reasons for the check engine light to go on. Check that your gas cap is screwed on securely and that it`s in good condition. If you have a tank of bad gas in the car, your check engine light may come on.
If your transmission fluid gets low enough, the check engine light could pop on. It`s important to have this checked out to make sure it doesn`t result in any serious damage.
Check your gas cap first. Many vehicles have a loose gas cap indicator that will be triggered before your check engine light comes on. If your gas cap is loose or the seal is not tight, the vapor leakage can cause your fuel system to trigger the check engine light.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

There is automatic transmission fluid in a manual transmission. Is it okay to leave or do I need manual transmission fluid?
ANSWER : This would depend on what the manufacturer recommends. Many manual transmissions do take automatic transmission fluid. If your transmission has ATF in it, it is very likely that it is supposed to have that in there. If not, it is likely that the transmission would not function properly with the wrong fluid. Many manual transmissions will also take engine oil as a lubricant. The best way to know for sure is to check your owner’s manual or call your local General Motors dealership to inquire.

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2013 Ford Focus Transmission Issue. Is it worth keeping the car?
ANSWER : Hi There,
This is a known issue in this generation Ford Focus and some Fiestas with the "Power Shift" transmission and there have been numerous recalls and lawsuits. Although, it is would be difficult to determine how much longer your transmission will last given the fact that you have many new parts, I would not recommend junking the car as it may still provide some valuable life left for you. I would recommend taking it to the dealer to see if these parts may be covered under the recall.

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Can too much transmission fluid cause speedometer malfunctions?
ANSWER : Hi there. In most cases when you overfill the transmission fluid it can cause excessive foaming of the fluid or possible internal component failure due to excessive pressure inside the hydraulic lines. Sensors like the speed sensors however are rarely impacted by this situation. However, in regards to the possibility of probability of this; I would say perhaps a 10% chance.

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Transmission fluid comes up out of the transmission vent tube attached to the transmission dipstick tube
ANSWER : Hi there. Fluid seepage out of the vent tube can sometimes be normal, but can also be caused by overfilling. Has a service been performed recently? Perform a fluid level and condition inspection by having the engine at idle, on a level surface, warmed up engine, and remove the dipstick and cleaning it with a shop towel. Reinsert the dipstick and fully remove to a horizontal position for inspection. Make sure the fluid is not milky, very dark, or has contamination. The level should be in the safe zone marked on the stick.

Have an inspection by a qualified technician determine if any problems truly do exist and provide you with some assurance. YourMechanic has several technicians available that can assist you with a transmission leak inspection and can perform a transmission fluid service if needed.

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Kia Optima 2004 v6 LX new engine old transmission no problems before with transmission now my transmission is shifting a high rpm
ANSWER : Hi There,
This may be an issue related to the communication of the PCM and the TCM (Transmission control module). As you may know, the TCM relies on the PCM to transmit information related to RPM’s, which the TCM then uses to determine when to direct the transmission to shift. The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle position sensors, turbine speed sensor, and transmission fluid temperature sensors that all direct information to it in order for it to perform it’s function. Other functions controlled by the TCM are components such as a kick down switch, traction control system, and cruise control module. Any of these may also affect the way the transmission control module performs and controls the transmission and the shifting of your vehicle. I would suggest having a professional from Your Mechanic come to your location to properly diagnose your transmission problem.

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Bought a 1999 Chevy Z71 for very cheap. The transmission is out. How should this be fixed?
ANSWER : Hi there. The 4l60e transmission could have two things wrong with it. Either the park arm is not disengaging inside the transmission making the transmission load up but not rotate the drive shaft or the transmission is low on oil. Check the oil on the transmission dip stick and see what the level is. The level must be checked with the engine running. If the oil level is at the full mark, then it is possible that the torque converter may have damaged the pump.

Remove a cooler line and put it into a bucket, and for a brief moment start up the engine and shut it off. If oil sprays out of the cooler line, then the pump is producing pressure. However, if no oil comes out of the cool line, then the pump is not working.

If you need further assistance troubleshooting your transmission, then I recommend having the transmission problem diagnosed by a local expert, such as one from YourMechanic. You will be be able to make a better decision about the car after finding out exactly what’s wrong with it.

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Can I add Lucas oil "transmission fix" to my transmission fluid to see if it helps my issue.
ANSWER : Adding an additive to the transmission to try and fix a problem will not work in most instances and should only be used as a last resort before getting a transmission overhaul.

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1998 mercedes benz c280 transmission fluid leak from top
ANSWER : Hi there. Unfortunately, we are not able to receive pictures or video to pinpoint damage or identify parts for vehicles through this platform. The best way to identify this item is to search online for a detailed schematic of your C280 Mercedes-Benz or contact a local MB specialist mechanic or the dealership service department to determine the parts name and function. You might also want to have a MB specialist mechanic install and inspect your vehicle for further transmission fluid leaks to ensure the repairs are correctly completed.

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