P0814 OBD-II Trouble Code: Transmission Range Display Circuit

Check Engine Light

P0814 code definition

The P0814 trouble code notes a problem with the transmission range display circuit

What the P0814 code means

The P0814 code is a standard OBD-II trouble code that detects a problem with the transmission shift range circuit and sensor. The transmission range sensor is responsible for sending data to the Powertrain Control Module (PCM), which the PCM uses to help decide optimal engine timing, the correct fuel delivery strategy, and many other things. When the PCM receives data from other sensors, such as the vehicle speed sensor or the transmission shift solenoid that suggests the transmission shift range is incurred, then the P0814 trouble code will be triggered.

What causes the P0814 code?

The P0814 trouble code is usually the result of a misadjusted transmission range sensor

However, there can be other causes, including:

  • Damage to the electrical components, such as the wires, connectors, and circuits
  • Corrosion on the range sensor connector
  • Malfunctioning range sensor

What are the symptoms of the P0814 code?

When the P0814 trouble code is detected, it will usually be accompanied by the Check Engine Light on the instrument panel. The transmission may also be impacted, which can result in rough shifting, and possibly even the inability to shift. It is likely that fuel efficiency will be lowered as well

How does a mechanic diagnose the P0814 code?

The P0814 code should be diagnosed using a standard OBD-II trouble code scanner. A reputable mechanic will use the scanner to view the freeze frame data and gather information about the code. The mechanic will also search for any additional trouble codes that have been detected. The trouble codes will then be reset, and the vehicle should be restarted to see if the codes return. If the P0814 code does not return, then it should be assumed that the issue is intermittent, or falsely triggered.

If the trouble code returns, the technician should begin with a visual inspection of the wires and connectors associated with the transmission range sensor. Any shorted or damaged wires, or loose or corroded connectors should be replaced. The mechanic can then use a digital volt/ohmmeter to inspect the resistance and continuity in the range display circuits.

Next, the mechanic should check the transmission range sensor to see if it is adjusted properly. If it is not, the mechanic can adjust it correctly. If it is already adjusted correctly, the mechanic should search for damage to the sensor, or corrosion on the sensor connector.

Whenever a component is replaced, the trouble codes should be reset and the vehicle restarted. That way the mechanic will know as soon as the issue has been resolved.

Common mistakes when diagnosing the P0814 code

The most frequently made mistake in diagnosing the P0814 code is the failure to adequately follow the OBD-II trouble code diagnosis protocol. It is important that mechanics always follow the protocol step by step, to make sure that the code is treated thoroughly and efficiently. It is common for the transmission range sensor to be erroneously replaced, when it simply needed an adjustment.

How serious is the P0814 code?

A vehicle with the P0814 code detected is usually still drivable. However, the car will have difficulty shifting, and sometimes may not shift at all, so it’s best to avoid driving the car. Damage can be done to the transmission if it is driven with a detected P0814 code, so the vehicle should be inspected and repaired as soon as possible.

What repairs can fix the P0814 code?

Some of the fixes for the P0814 trouble code are:

Additional comments for consideration regarding the P0814 code

The P0814 trouble code only applies to vehicles that have automatic transmissions.

Need help with a P0814 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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