<ul> <li><b>Engine Light ON</b>: The Engine Light or Service Engine Soon Warning Light illuminates, indicating an issue with the Torque Converter Clutch Pressure Control Solenoid Control Circuit. This can be caused by a stuck solenoid, electrical issues, or a malfunctioning transmission control module.</li> <li><b>Transmission Slippage</b>: The vehicle may experience transmission slippage, where the engine revs but the vehicle does not accelerate as expected. This can be due to the torque converter clutch not engaging properly.</li> <li><b>Poor Fuel Economy</b>: A stuck solenoid can lead to poor fuel economy as the torque converter clutch may not lock up, causing the engine to work harder and consume more fuel.</li> <li><b>Harsh Shifting</b>: The vehicle may exhibit harsh or erratic shifting due to improper control of the torque converter clutch pressure.</li> <li><b>Overheating Transmission</b>: Continuous slippage and improper torque converter operation can lead to overheating of the transmission fluid, potentially causing further damage.</li> </ul>

<ul><li>The Torque Converter Clutch Pressure Control Solenoid may be faulty, leading to improper pressure control.</li><li>An open or shorted harness in the Torque Converter Clutch Pressure Control Solenoid can disrupt the circuit.</li><li>Poor electrical connections in the Torque Converter Clutch Pressure Control Solenoid circuit can cause intermittent or continuous issues.</li></ul>

<ul> <li><b>Initial Scan</b>: Use an OBD-II scanner to confirm the presence of DTC P2758 and check for any additional codes that may be related.</li> <li><b>Visual Inspection</b>: Inspect the wiring and connectors related to the Torque Converter Clutch (TCC) Pressure Control Solenoid for any signs of damage, corrosion, or disconnection.</li> <li><b>Check Solenoid Resistance</b>: Using a multimeter, measure the resistance of the TCC Pressure Control Solenoid. Compare the readings with the manufacturer's specifications.</li> <li><b>Inspect Transmission Fluid</b>: Check the transmission fluid level and condition. Low or contaminated fluid can affect solenoid operation.</li> <li><b>Test Power and Ground Circuits</b>: Verify that the TCC Pressure Control Solenoid is receiving proper voltage and ground. Use a test light or multimeter to check the power supply and ground connections.</li> <li><b>Perform Solenoid Activation Test</b>: Use a scan tool to command the TCC Pressure Control Solenoid on and off. Listen for an audible click or use a scope to verify solenoid operation.</li> <li><b>Check for PCM/TCM Updates</b>: Consult the manufacturer’s service information for any software updates or Technical Service Bulletins (TSBs) related to the Powertrain Control Module (PCM) or Transmission Control Module (TCM).</li> <li><b>Replace Solenoid if Necessary</b>: If all tests indicate a faulty TCC Pressure Control Solenoid, proceed with its replacement. Clear the codes and perform a road test to ensure the issue is resolved.</li></ul>

<p>The DTC code P2758 indicates a <b>Torque Converter Clutch Pressure Control Solenoid Control Circuit Stuck On</b>. This is a critical issue as it can lead to severe transmission problems.</p><ul><li><b>Immediate Actions:</b> Inspect and possibly replace the solenoid.</li><li>Check the wiring and connectors for damage or corrosion.</li><li>Perform a transmission fluid check and replace if necessary.</li></ul><p>Delaying repair can result in transmission failure, leading to costly repairs and potential vehicle immobility.</p>