DTC Code P062C – What does this code mean?

<ul> <li><b>Engine Light ON</b>: The engine light or service engine soon warning light illuminates, indicating a potential issue with the internal control module's ability to monitor and manage vehicle speed performance. This can be caused by a malfunctioning control module, wiring issues, or sensor failures.</li> <li><b>Erratic Speedometer Readings</b>: The speedometer may display erratic or inaccurate readings, which can be linked to a faulty internal control module or issues with the vehicle speed sensor.</li> <li><b>Poor Engine Performance</b>: The vehicle may experience poor engine performance, such as hesitation or stalling, due to the internal control module's inability to properly manage speed-related functions.</li> <li><b>Transmission Shifting Problems</b>: There may be issues with transmission shifting, such as hard shifts or slipping, which can be related to the internal control module's performance in managing vehicle speed.</li> </ul>

<ul><li>Software incompatibility can lead to improper communication between the control module and other vehicle systems.</li><li>A faulty Powertrain Control Module (PCM) may fail to process speed data correctly.</li><li>An open or shorted PCM harness can disrupt the signal transmission.</li><li>Poor electrical connections in the PCM circuit can cause intermittent or complete loss of communication.</li><li>Issues in the module communications network can prevent proper data exchange between modules.</li><li>Malfunctioning Output Shaft Speed (OSS) sensor can provide incorrect speed readings.</li><li>Problems with the Turbine Shaft Speed (TSS) sensor can affect speed calculations.</li><li>Concerns with the Anti-lock Brake System (ABS) can interfere with speed signal processing.</li></ul>

<ul> <li><b>Retrieve and Record Codes</b>: Connect the diagnostic scanner to the vehicle's diagnostic port. Retrieve all stored codes and freeze frame data. Record this information for future reference.</li> <li><b>Clear Codes and Test Drive</b>: Clear the codes and test drive the vehicle until the code is reset or the PCM enters readiness mode. If the code is intermittent, it may be more difficult to diagnose.</li> <li><b>Check for TSBs</b>: Search for technical service bulletins (TSBs) that match the code, vehicle year, make, model, and symptoms. TSBs may provide valuable diagnostic information.</li> <li><b>Inspect ECM/PCM Power Supply</b>: If ECM/PCM power supply codes are present, address these issues first. Use a DVOM to test controller power supply fuses and relays. Replace any blown fuses and ensure relays are functioning properly.</li> <li><b>Inspect VSS and Circuits</b>: If VSS codes are present, diagnose and repair these first. Use a scanner or oscilloscope to test VSS output. Look for inconsistent or erratic readings. Use a DVOM to perform resistance tests on the VSS sensor and circuits.</li> <li><b>Visual Inspection of Wiring and Grounds</b>: Perform a visual inspection of controller-related wiring and harnesses. Check chassis and engine ground junctions. Use a DVOM to test ground integrity.</li> <li><b>Inspect System Controllers</b>: Visually inspect system controllers for signs of water, heat, or collision damage. Any damaged controller, especially by water, should be considered defective.</li> <li><b>Suspect Defective Controller</b>: If all power and ground circuits are intact, suspect a defective controller or a controller programming error. Controller replacement will require reprogramming, which may need to be done through a dealership or qualified source.</li></ul>

<p>The DTC code P062C indicates an issue with the Internal Control Module Vehicle Speed Performance. This is a critical issue as it affects the vehicle's speed control, which can lead to unsafe driving conditions.</p><ul><li><b>Immediate Actions:</b> Inspect the control module and related wiring for faults.</li><li>Check for software updates or reprogramming needs.</li><li>Replace the control module if necessary.</li></ul><p>Delaying repair can result in loss of vehicle control and potential accidents.</p>