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P2803, P2806 PCM failure, TCM failure, Transmission range sensor failure

Land Rover OBD-II Trouble Codes ------------------------------------------------The diagnostic trouble codes (DTCs) P2803 and P2806 are related to issues with the Powertrain Control Module (PCM), Transmission Control Module (TCM), and the Transmission Range Sensor. Here's a breakdown of each code:

1. **P2803 - Transmission Range Sensor "A" Circuit Low Input:**
   - This code indicates a low voltage condition in the circuit associated with Transmission Range Sensor "A." The range sensor helps the TCM determine the current gear position of the transmission.

2. **P2806 - Transmission Range Sensor "A" Circuit Range/Performance:**
   - P2806 points to a range or performance issue in the circuit associated with Transmission Range Sensor "A." This can occur when the sensor's input does not match the expected values.

### Possible Causes:

1. **Transmission Range Sensor Issues:** Problems with the Transmission Range Sensor, including low voltage or incorrect input signals.

2. **Wiring Issues:** Problems with the wiring or connectors associated with the Transmission Range Sensor circuit.

3. **Powertrain Control Module (PCM) Issues:** A potential failure or malfunction in the PCM, which controls and monitors various aspects of the engine and transmission.

4. **Transmission Control Module (TCM) Issues:** A potential failure or malfunction in the TCM, responsible for controlling the transmission.

### Diagnostic Steps:

1. **Inspect Transmission Range Sensor:** Check the Transmission Range Sensor for signs of damage or wear. Ensure that it is functioning properly and providing the correct voltage signals.

2. **Check Wiring and Connectors:** Inspect the wiring and connectors associated with the Transmission Range Sensor circuit. Look for any signs of damage, corrosion, or loose connections.

3. **Test Transmission Range Sensor Operation:** Use a diagnostic tool to test the operation of the Transmission Range Sensor. Verify that it accurately detects the current gear position.

4. **Perform Continuity Tests:** Check for continuity in the wiring from the Transmission Range Sensor to the TCM and PCM.

5. **Verify TCM and PCM Operation:** Test both the TCM and PCM for proper operation. Replace if necessary.

6. **Clear Codes:** After addressing any identified issues, clear the trouble codes and monitor the system for recurrence.

7. **Consider Professional Assistance:** If you are unsure about diagnosing or addressing these issues yourself, or if the faults persist, it's advisable to consult with a qualified mechanic or transmission specialist.

Addressing the root cause of the Transmission Range Sensor circuit faults is crucial for ensuring accurate transmission gear position detection and preventing drivability issues. If in doubt or if the faults persist, seeking professional assistance is recommended for a thorough diagnosis and effective repair.

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