P074C - OBD Trouble Code

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Just like P074B and P074A, OBD Error Code P074D is a generic trouble code and mostly applies to all the OBD-II vehicles. In Spite of being generic the ways to diagnose and correct may vary from vehicle to vehicle. To have a deeper knowledge of OBD error code P074C you will have to go through our subsequent sections.

Remember that it is definitely a good idea to avoid driving your vehicle if you experience transmission problems such as stuck gear or failing to engage gears. Your vehicle’s engine control module will set this error code P074C when it inspects that the automatic transmission is not able to or is finding trouble in going into gear 4. To know more about this error code and its related causes have a look at the section below.

What causes this problem with the Unable To Engage Gear 4?

• Damaged or bad IMRC sensor or actuator
• Leaking vacuum causing an overly lean mixture
• Leaking air of the diesel particulate filter causing the faulty sensor reading
• Faulty, dirty or clogged air cleaner element
• Dirty automatic transmission fluid (ATF)
• Low transmission fluid level
• Faulty diesel particulate filters
• Open or shorted TCM harness
• Transmission Control Modules being faulty

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It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P074C here:

Common Symptoms

• Transmission failure in engaging gear 4
• Fall in engine power
• Problems with vehicle speeds
• Leaking automatic transmission fluid
• Discovering red fluid under your vehicle
• Weird engine noises
• Fall in throttle response
• Restricted vehicle speeds

Want to correct the Trouble Code P074C? Read these points mentioned below:

• Changing the automatic transmission fluid or filter, whichever is at fault
• Clean or replace the dirty & clogged DPF
• Change the faulty DPF and related harnesses and parts
• Change the faulty transmission control module
• Also, replace the damaged fuel level sensor
• Do replace the spark plugs and knock sensors if found faulty

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If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

To begin the diagnosis the first thing to do is to check for the automatic transmission fluid integrity. Make use of a dipstick to check the automatic transmission fluid level, while its running and while it’s in park. Keep in mind that the procedure to do so will vary greatly from manufacturer to manufacturer. You can definitely make use of the service manual present in your car’s dash. Next, check for any debris or dirt in the fluid. Before proceeding further, you will need to make sure it is free of all this as a dirty ATF can adversely affect the operation of your transmission. Now, in case you discover any leaks and witness low fluid level then we recommend you to check for any signs of oil stains or puddles in your driveway. The next step is to inspect your vehicle’s transmission control modules for any potential issues. Also check for any signs of water intrusion. Also look for any signs of corrosion on housings or connectors. If you do not find any issue with the above stated steps then consider monitoring your gear position and its functionality. While doing so you will be able to tell of the transmission is shifting or not by its drivability. In case it is floored and accelerated too slow then it is probably stuck a high gear - 4, 5, 6 or 7. In case it is accelerating too fast then it is stuck at a lower gear - 1, 2 or 3.

Common Mistakes When Diagnosing the P074C Code

If you want to avoid any misdiagnosis, take care of the following failures

• Failing internal transmission
• Failing TCM
• Low transmission fluid
• Failing transmission solenoid
• Issues with the wiring system