<ul> <li><b>Engine Light ON</b>: The Engine Light or Service Engine Soon Warning Light illuminates, indicating an issue with the Input/Turbine Speed Sensor 'B' Circuit. This can be caused by intermittent electrical connections, sensor failure, or wiring issues.</li> <li><b>Transmission Shifting Problems</b>: Erratic or harsh shifting may occur due to the transmission control module receiving inconsistent speed data from the Input/Turbine Speed Sensor 'B'. Potential causes include sensor malfunction, damaged wiring, or poor electrical connections.</li> <li><b>Reduced Fuel Efficiency</b>: Inaccurate speed readings can lead to improper transmission operation, affecting fuel efficiency. This symptom may be linked to a faulty sensor or intermittent circuit issues.</li> <li><b>Vehicle Stalling or Hesitation</b>: The vehicle may experience stalling or hesitation during acceleration due to incorrect speed data being sent to the engine control unit. This can be caused by sensor issues or intermittent electrical connections.</li> </ul>

<ul><li>The input speed sensor may be faulty, leading to intermittent signal issues.</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 communication problems.</li></ul>

<ul> <li><b>Check Technical Service Bulletins (TSB)</b>: Review TSBs for known issues and fixes related to the P2768 code for your specific vehicle.</li> <li><b>Perform Visual Inspection</b>: Inspect system wiring, connectors, battery, battery cables, and alternator output. Repair any shorted or open circuits and connectors.</li> <li><b>Retrieve and Record Codes</b>: Connect an advanced diagnostic scanner to the diagnostic port, retrieve all stored codes, and note freeze frame data.</li> <li><b>Analyze Data Stream</b>: Use the scanner to narrow the data stream to pertinent information and determine which circuit is malfunctioning.</li> <li><b>Inspect Sensors for Debris</b>: Remove the input/turbine speed sensor and check for metallic debris on magnetic contacts. Clean excessive debris before reinstallation.</li> <li><b>Inspect Reluctor Wheel</b>: Check interruption grooves and/or reluctor wheel notches for signs of damage or wear.</li> <li><b>Test Sensor Resistance and Circuit Voltage</b>: Use a DVOM to test individual sensor resistance and circuit voltage according to manufacturer’s guidelines. Replace sensors that do not meet specifications.</li> <li><b>Check for PCM Issues</b>: If all system circuits and sensors are in proper working order, suspect a faulty PCM or a PCM programming error.</li> <li><b>Additional Diagnostic Notes</b>: Ensure sensor to reluctor clearance is correct, check for transmission fluid in the connector area, and be cautious of hot transmission fluid when removing sensors.</li></ul>

<p>The DTC code P2768 indicates an intermittent issue with the Input/Turbine Speed Sensor 'B' circuit. This can lead to erratic transmission behavior, such as harsh shifting or slipping.</p><ul><li><b>Immediate Actions:</b> Inspect the sensor and its wiring for damage or loose connections.</li><li><b>Potential Risks:</b> Delayed repair can result in further transmission damage and reduced vehicle performance.</li></ul>