<ul> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: The illumination of the engine light indicates a detected issue with the Input/Turbine Speed Sensor 'B' Circuit. This could be due to a malfunctioning sensor, wiring issues, or a problem with the transmission control module.</li> <li><b>Erratic Transmission Shifting</b>: The vehicle may experience irregular or harsh shifting patterns. This symptom is often linked to inaccurate speed readings from the Input/Turbine Speed Sensor 'B'.</li> <li><b>Transmission Slippage</b>: The transmission may slip or fail to engage properly. This can occur if the sensor is providing incorrect data to the transmission control module.</li> <li><b>Reduced Fuel Efficiency</b>: Inaccurate speed sensor readings can lead to suboptimal transmission performance, which may result in decreased fuel efficiency.</li> </ul>

<ul><li>The Input Speed Sensor may be faulty, leading to incorrect readings or no signal at all.</li><li>An open or shorted harness in the Input Speed Sensor can disrupt the signal transmission.</li><li>Poor electrical connections in the Input Speed Sensor circuit can cause intermittent or no signal issues.</li></ul>

<ul> <li><b>Check for Technical Service Bulletins (TSB)</b>: Verify if there are any TSBs related to the P2765 code for your vehicle. This can provide known fixes and save diagnostic time.</li> <li><b>Visual Inspection</b>: Inspect system wiring and connectors for disconnections, corrosion, burns, or shorts. Repair or replace as necessary.</li> <li><b>Battery and Cable Inspection</b>: Test the battery and inspect battery cables and ends. Clean corrosion and secure terminals as needed.</li> <li><b>Retrieve and Note Codes</b>: Connect a diagnostic scanner to the port and retrieve all stored codes. Note all codes and freeze frame data for future reference.</li> <li><b>Data Stream Analysis</b>: Use the scanner data stream to determine which circuit is malfunctioning. Narrow the data stream to related data for more responsive delivery.</li> <li><b>Sensor Removal and Inspection</b>: Remove sensors and check for excessive metal debris on magnetic contacts. Clean debris and inspect interruption grooves or reluctor wheel notches.</li> <li><b>Sensor Testing with DVOM</b>: Test individual sensors using a DVOM according to manufacturer specifications. Replace sensors that do not meet specifications.</li> <li><b>Controller Disconnection for Testing</b>: Disconnect related controllers before testing resistance and continuity with the DVOM to avoid controller damage.</li> <li><b>System Circuit Testing</b>: Test system circuits for shorted or open wiring. Repair or replace defective circuits as needed.</li> <li><b>PCM Evaluation</b>: If all circuits and sensors are functional, suspect a faulty PCM or a PCM programming error.</li></ul>

<p>The DTC code P2765 indicates an issue with the Input/Turbine Speed Sensor 'B' Circuit. This is critical as it affects the transmission's ability to properly shift gears.</p><ul><li><b>Immediate Actions:</b> Inspect and possibly replace the speed sensor.</li><li><b>Potential Risks:</b> Delayed repair can lead to transmission failure, resulting in costly repairs and unsafe driving conditions.</li></ul>