P0814 Transmission Range (TR) Display Circuit Malfunction
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P0814 – OBD-II Trouble Code Technical Description
Trouble code P0814 indicates a faulty transmission range display circuit.
What does the fault code mean P0814?
Trouble code P0814 indicates a problem in the transmission range display circuit. This error code occurs on vehicles with an automatic transmission. If the vehicle stores this code, it may indicate that the powertrain control module (PCM) has detected a discrepancy between the indication and actual gear, or that the transmission range sensor circuit voltage is out of range, which may cause the Malfunction Indicator Lamp (MIL) to come on.
Possible reasons
Some possible reasons for the P0814 trouble code:
- Transmission range sensor circuit failure: This may include opens or shorts in the wires or connectors, damage to the sensor itself or its signal circuit.
- Transmission Range Display Problems: If the display itself is faulty or not functioning correctly, it can cause a P0814 code to occur.
- Improper installation or calibration of the transmission range sensor: Incorrect installation or calibration of the sensor may result in a discrepancy between the display reading and the actual transmission position.
- PCM Problems: Problems with the engine and transmission control module itself can also cause P0814.
- Electrical Problems: Short circuits, broken wiring, or grounding problems in the sensor or display circuit can cause this error.
It is important to conduct a thorough diagnosis to pinpoint the source of the problem and resolve it.
What are the symptoms of a fault code? P0814?
Symptoms for a P0814 trouble code can vary depending on the specific problem in the system, some of the potential symptoms that may occur are:
- Transmission Range Display Failure: May result in an incorrect or unreadable display of the selected transmission range on the instrument panel.
- Gear Shifting Problems: In case the problem is due to the transmission range sensor signal not matching the actual transmission position, it may cause the gear shift to not work properly.
- Insufficient or missing reverse mode indication: If the problem is with the reverse sensor, there may be no indication that the reverse mode is activated when it is actually activated.
- Malfunction Indicator Light (MIL): When trouble code P0814 is detected, the Malfunction Indicator Light (MIL) may illuminate, indicating a problem with the transmission system.
If these symptoms appear, it is recommended to contact a service center for diagnostics and troubleshooting.
How to diagnose a fault code P0814?
The following steps are recommended to diagnose DTC P0814:
- Using an OBD-II scanner: Connect the OBD-II scanner to your vehicle's diagnostic port and read the trouble codes. Make sure P0814 is in the list of stored codes.
- Testing the transmission range display: Check the operation and display of the transmission range on the instrument panel. Make sure the information displayed matches the actual transmission position.
- Checking the transmission range sensor: Check the transmission range sensor for damage and proper installation and connection. Check wires and connectors for breaks, shorts or damage.
- PCM and Circuit Check: Check the engine and transmission control module (PCM) for faults. Also check the electrical circuits associated with the transmission range sensor for corrosion, opens, shorts, and improper connections.
- Additional Tests: If necessary, perform additional tests such as checking the sensor resistance, checking the voltage on the sensor circuit, and testing the shift and reverse operation.
- Use of Specialized Equipment: In some cases, it may be necessary to use specialized equipment, such as an oscilloscope, to diagnose the electrical signals and sensor operation in more detail.
Once diagnostics have been performed and the source of the problem has been identified, you can proceed with the necessary repairs or replacement of parts. If you are not confident in your diagnostic and repair skills, it is better to contact a professional auto repair shop.
Diagnostic errors
When diagnosing DTC P0814, the following errors may occur:
- Misinterpretation of Symptoms: A mistake can be made by misinterpreting symptoms that may be related to other transmission problems rather than the transmission range display. For example, an incorrect transmission range display may be caused not only by a fault with the display itself, but also by other problems such as the gear or transmission position sensor.
- Insufficient testing of the transmission range sensor: An error may occur if the transmission range sensor and its electrical connections are not properly checked. Incorrect connection or damage to the sensor can also lead to diagnostic errors.
- Incomplete Circuit Diagnostics: If the circuits associated with the transmission range sensor are not sufficiently tested, problems with wiring, connectors, or other electrical system components may be missed.
- Test Results Inconsistency: Sometimes diagnostic results may not meet expected or standard values due to errors in the testing process or misinterpretation of data.
- Factors not taken into account: An error may occur if other factors that may affect the operation of the transmission range sensor, such as external influences or mechanical damage, are not taken into account.
To minimize diagnostic errors, it is recommended to follow the vehicle manufacturer's procedures and recommendations, use the correct equipment, and have experience in diagnosing and repairing transmissions.
How serious is the fault code? P0814?
Trouble code P0814 indicates a problem with the transmission range display circuit. This is an important part of the transmission's operation, as displaying the correct gear range is important to the vehicle's proper operation.
While this code itself is not urgent and does not pose a security risk, it can cause inconvenience and inability to correctly determine the current gear range. If the P0814 code persists, it can lead to a poor driving experience and additional transmission problems.
Therefore, although this is not a safety-critical issue, it is recommended that it be repaired as soon as possible to avoid further transmission problems and ensure normal vehicle operation.
What repair will help eliminate the code? P0814?
To resolve DTC P0814, follow these steps:
- Checking the Transmission Range Sensor: The first step is to check the transmission range sensor and its electrical connections for damage or corrosion. If problems are found, the sensor should be replaced.
- Checking Electrical Circuits: Next, you need to check the electrical circuits associated with the transmission range sensor for opens, shorts, or other electrical problems. If any problems are found, they should be corrected.
- Checking and replacing the transmission range display: If the problem is not with the sensor or electrical circuits, then the transmission range display itself may be faulty. In this case, it will need to be checked and, if necessary, replaced.
- Software Update: Sometimes the problem can be caused by a bug in the PCM software. In this case, it is recommended to perform a PCM software update to resolve the issue.
- Diagnosis of Other Transmission Components: If the above steps do not resolve the problem, further diagnosis of other transmission components such as control valves, solenoids, etc. will need to be performed.
It is recommended that you contact a qualified auto mechanic or auto repair shop to diagnose and repair the P0814 code.
P0814 – Brand-specific information
Trouble code P0814 can occur on various brands of cars, a list of some brands of cars with their meanings:
- Ford: Transmission range (TR) display circuit malfunction.
- Chevrolet: Transmission range (TR) display circuit malfunction.
- Toyota: Transmission range (TR) display circuit malfunction.
- Honda: There is a problem with the transmission range display circuit.
- Volkswagen: There is a problem with the transmission range display circuit.
- Nissan: Transmission range (TR) display circuit malfunction.
- Hyundai: There is a problem with the transmission range display circuit.
- BMW: Transmission range (TR) display circuit malfunction.
- Mercedes-Benz: There is a problem with the transmission range display circuit.
- Audi: Transmission range (TR) display circuit malfunction.
Please note that the codes may vary slightly depending on the vehicle manufacturer and model. It is important to refer to the specifications and repair manual for your specific vehicle make and model for accurate diagnosis and repair.
