P0814 Transmission Range Display Circuit
OBD-II Trouble Code Technical Description
Transmission Range Display Circuit
What does that mean?
This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). That may include but is not limited to vehicles from Mercedes-Benz, Jaguar, Range Rover, Ford, Volvo, Sprinter, etc. Although generic, the exact repair steps may vary depending on year, make, model and powertrain configuration.
If your vehicle has stored a code P0814, it means that the powertrain control module (PCM) has detected a malfunction in the transmission range display circuit. This type of code is limited to vehicles with automatic transmissions.
The transmission control module (TCM) may be a stand alone module or part of the PCM. The transmission range display sensor is often integrated into the neutral safety switch. The transmission range display sensor is actuated by the shift shaft and provides a voltage signal to the PCM and the instrument panel control module (IPCM) which reflects the specific gear that has been selected. Various engine and transmission outputs are monitored by the PCM to determine whether the transmission range display sensor is in the appropriate position. Additionally, the PCM monitors transmission range sensor circuit voltage to ensure that is within established parameters.
If the PCM detects that the vehicle is moving in a fashion which is not conducive to the gear selection input by the transmission range display sensor or if circuit voltage is not within allowable parameters, a code P0814 may be stored and a malfunction indicator lamp (MIL) illuminated. Multiple ignition cycles (with a failure) may be required for MIL illumination.
What is the severity of this DTC?
A stored code P0814 indicates that either a serious electrical issue or some type of mechanical failure has occurred. At any rate, conditions which contributed to a code of this nature being stored should be rectified as quickly as possible.
What are some of the symptoms of the code?
Symptoms of a P0814 trouble code may include:
What are some of the common causes of the code?
Causes for this code may include:
What are some P0814 troubleshooting steps?
A diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of vehicle specific diagnostic information will be required to diagnose a code P0814.
You may use your source of vehicle information to locate a technical service bulletin (TSB) that matches the vehicle year, make, and model; as well as the engine size, code/s stored, and symptoms exhibited. If you find one, it could yield helpful diagnostic information.
Use the scanner (connected to the vehicle diagnostic connector) to retrieve all stored codes and pertinent freeze frame data. It is a good idea to write this information down before clearing the codes then test-drive the vehicle until the PCM either enters readiness mode or the code is reset.
If the PCM enters readiness mode at this time, the code is intermittent and may be much more difficult to diagnose. If this is the case, the conditions which contributed to the code being stored may need to worsen before an accurate diagnosis can be made.
If the code is immediately reset, the next step of your diagnosis will require that you search your vehicle information source for diagnostic flow-charts, connector pin-out charts, connector face views, and component testing procedures/specifications.
Step 1
Use the DVOM to test voltage, ground, and signal output at the transmission range display sensor or neutral safety switch. Transmission range display sensor input and output circuits typically consist of either reference voltage (transmission in gear) or ground (transmission in park or neutral).
Step 2
If system circuits are functional, use the DVOM to test the transmission range display sensor. Replace sensors that do not test within system specifications.
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"Delete Error Code Permanently, Disable DTC Error Code Function for p0814 in the ECU"
In extreme cases, we even have the option to permanently remove the specific DTC p0814 and disable the function of the specific error code in the ECU. All other fault code functions will then continue to work to protect the engine. This is different from clearing an error code with a diagnostic device. We have the option to permanently remove the function of the specific error code, so that it never comes back. Also emergency running that occurs on the specific error code can be solved in most cases.
Of course we prefer to first try to solve the cause of the error code, but sometimes the only solution is to permanently disable the DTC function of p0814.
