Transmission Range Display Circuit Malfunction
The P0814 code indicates a problem in the transmission range display circuit, which is responsible for sending the gear selector position (Park, Reverse, Neutral, Drive) to the instrument cluster. This circuit typically involves the transmission range sensor (also known as the neutral safety switch or inhibitor switch) and its wiring. When the PCM detects an incorrect or missing signal, it sets this code. Common causes include a faulty range sensor, damaged wiring or connectors, or a short circuit. This can lead to incorrect gear display or starting issues.
01. Most Common Causes
- Faulty transmission range sensor
- Damaged or corroded wiring/connectors in the range sensor circuit
- Short circuit or open circuit in the range sensor circuit
- Faulty PCM (rare)
02. Symptoms You Will Notice
- Incorrect gear position displayed on the dashboard
- Engine may not start or start in wrong gear
- Transmission may not shift properly
- Check Engine Light illuminated
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the transmission range sensor wiring and connector for damage, corrosion, or loose connections.
Step 3: Test the transmission range sensor signal using a multimeter according to manufacturer specifications.
Step 4: If sensor and wiring are okay, check for shorts or opens in the circuit between the sensor and PCM.
Step 5: If all else fails, replace the transmission range sensor and clear the code.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended because the transmission may not shift correctly or the vehicle may not start, posing a safety risk.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor, depending on the vehicle and shop rates.