Technical Description of OBD-II Trouble Code
Unable to Shift into Gear 5
What does that signify?
This is a standard diagnostic trouble code (DTC) for powertrain issues and is commonly found in OBD-II vehicles with automatic transmissions. This can include vehicles from various manufacturers such as Volkswagen, Audi, Nissan, Mazda, Ford, and others. While it is a generic code, the specific repair steps may vary depending on the year, make, model, and powertrain configuration of the vehicle. However, it is worth noting that this code is frequently observed in VW and Audi vehicles.
As we drive our vehicles, numerous modules and computers monitor and adjust a vast amount of components and systems in order to make the vehicle’s operation seamless and efficient. Among those components and systems is the automatic transmission (A/T).
Within the A/T alone, there are numerous moving parts, systems, and components that work together to keep the transmission in the correct gear based on the driver’s demands. Another crucial component is the TCM (Transmission Control Module), which is responsible for monitoring, adjusting, and correlating various values, speeds, and driver inputs to effectively shift the vehicle. Given the complexity of this system, it is advisable to start with the basics when troubleshooting.
If you are encountering this code, it is likely that your vehicle is not able to accelerate quickly or may not move at all. If you find yourself stuck in a gear or neutral, it is recommended to avoid driving the vehicle until the issue is resolved. For example, if you are stuck in second gear and attempting to reach highway speeds, your engine will be under significant strain to maintain the desired speed. This can potentially cause damage to the engine.
The ECM (Engine Control Module) will activate the CEL (Check Engine Light) and store a code P073A when it detects that the automatic transmission is stuck in gear 5.
Automatic transmission gear indicator:
What is the severity of this DTC?
I would classify it as moderately high. Codes like this should be addressed immediately. While the vehicle may still be drivable, it is important to repair the issue to prevent further damage. Ignoring the symptoms or delaying the repair could potentially result in costly repairs. Automatic transmissions are intricate systems that require proper maintenance for optimal performance.
What are some of the symptoms of the code?
Some symptoms of a P073A trouble code may include:
What are some of the common causes of the code?
Possible causes for this P073A code may include:
What are some troubleshooting steps for P073A?
Basic Step #1
Check the integrity of your ATF (Automatic Transmission Fluid). Use the dipstick (if available) to check the A/T level while the vehicle is running and in park. The procedure for checking the fluid level may vary depending on the manufacturer. Refer to the service manual or the dipstick itself for instructions. Ensure that the fluid is clean and free from debris. If you have never serviced the transmission, it is advisable to check your records and service the transmission accordingly. Dirty ATF can significantly affect the transmission’s functionality.
Tip: Always check the ATF level on a flat surface for accurate readings. Use the manufacturer-recommended fluid.
Basic Step #2
Are there any leaks? If the fluid level is low, it is likely that there is a leak. Check your driveway for any signs of oil stains or puddles. Addressing any leaks is important, regardless of whether it is the root cause of the issue.
Basic Step #3
Inspect your TCM (Transmission Control Module) for any damage. If it is located on the transmission or in a location exposed to the elements, look for signs of water intrusion. This can potentially cause the issue, among other possibilities. Corrosion on the housing or connectors is also indicative of a problem.
Basic Step #4
If everything checks out so far, use your OBD2 scanner to monitor the gear position and verify its functionality. Additionally, the drivability of the vehicle can provide clues about whether the transmission is shifting properly. For example, if you press the accelerator pedal fully and the vehicle accelerates slowly, it may be stuck in a high gear (4, 5, 6, 7). If the vehicle’s speed does not reach the desired level despite rapid acceleration, it may be stuck in a low gear (1, 2, 3).
