P073D Unable to turn on neutral
OBD2 Error Codes

P073D Unable to turn on neutral

26.05.2022 /

P073D Unable to turn on neutral

OBD-II DTC Datasheet

Cannot use neutral

What does this mean?

This is a Generic Transmission Diagnostic Trouble Code (DTC) and is commonly applied to OBD-II vehicles equipped with an automatic transmission. This may include but is not limited to Volkswagen, Audi, Nissan, Mazda, Ford, etc. Despite the general nature, the exact repair steps may vary depending on the model year, make, model and transmission configuration.

When we drive our vehicles, numerous modules and computers monitor and regulate a huge number of components and systems to make the vehicle run smoothly and efficiently. Among these components and systems, you have an automatic transmission (A / T).

In an automatic transmission alone, there are countless moving parts, systems, components, etc. to keep the transmission in the correct gear as required by the driver. The other important part of all this is the TCM (Powertrain Control Module), its main function is to control, adjust and correlate various values, speeds, driver actions, etc., as well as effectively switch the car for you! Given the sheer number of possibilities here, you'll want to get started and most likely stick to the basics here.

Chances are, if you're looking for this code, your car won't go anywhere (if not anywhere at all!). If you are stuck in a gear or unable to shift into gear, it would be a good idea to avoid driving or trying until the problem has been corrected.

The ECM (Engine Control Module) will illuminate CEL (Check Engine Light) and will set a P073D code when it detects that the automatic transmission is unable to engage neutral.

Automatic transmission gear indicator: P073D Unable to turn on neutral

What is the severity of this DTC?

I would say moderately tall. These types of codes should be started immediately. Of course, the car can even drive down the street, but you will need to get it repaired before any further damage occurs. You can literally cost yourself several thousand dollars if you neglect it or ignore the symptoms for too long. Automatic transmissions are extremely complex and require proper care to ensure trouble-free operation.

What are some of the symptoms of the code?

Symptoms of a P073D trouble code may include:

  • Abnormal vehicle speeds
  • Low power
  • The car is not moving
  • Gearbox does not engage gear
  • Abnormal engine noises
  • Reduced throttle response
  • Limited vehicle speed
  • ATF leak (automatic transmission fluid) (red fluid under the vehicle)

What are some of the common causes for the code?

Reasons for this P073D code may include:

  • Clogged transmission hydraulics
  • Low ATF
  • Dirty ATF
  • Wrong ATF
  • Shift solenoid problem
  • TCM problem
  • Wiring problem (i.e. chafing, melting, short, open, etc.)
  • Connector problem (e.g. melting, broken tabs, corroded pins, etc.)

What are some steps to troubleshoot the P073D?

Basic step # 1

Check the integrity of your ATF (automatic transmission fluid). Using the dipstick (if equipped), check the automatic transmission level while the vehicle is moving and parked. This procedure varies considerably between manufacturers. However, this information can usually be found fairly easily in the service manual on the dashboard, or sometimes even printed on the dipstick itself! Make sure the liquid is clean and free of debris. If you do not remember that you have ever provided a transfer service, it would be a good idea to check our records and service your transfer accordingly. You might be surprised how dirty ATF can affect the performance of your transmission.

Tip: Always check the ATF level on a level surface to get an accurate reading. Be sure to use the fluid recommended by the manufacturer.

Basic step # 2

Are there leaks? If you have low fluid levels, it is probably going somewhere. Check the driveway for any traces of oil stains or puddles. Who knows, maybe this is your problem. This is a good idea anyway.

Basic step # 3

Check your TCM (transmission control module) for damage. If it is located on the transmission itself or anywhere else where it may be exposed to elements, look for any signs of water ingress. It could definitely cause such a problem, among possible others. Any sign of corrosion on the case or connectors is also a good sign of a problem.

Basic step # 4

If everything is still being checked, depending on the capabilities of your OBD2 scanner, you can track the position of the gear and check if it works. This makes it easy to tell if your transmission is shifting or not by simple handling. Have you put it on the floor and does it accelerate painfully slowly? He's probably stuck in high gear (4,5,6,7). Can you accelerate fast, but the speed of the car will never be as fast as you would like? He's probably stuck in low gear (1,2,3).

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NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.

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