DTC Code P2437 – What does this code mean?

<ul> <li><a href="/problems/engine-warning-light-on"><b>Engine Light ON</b></a>: The check engine light or service engine soon warning light illuminates, indicating an issue with the secondary air injection system.</li> <li><a href="/problems/decreasing-engine-performance"><b>Poor Engine Performance</b></a>: The vehicle may experience reduced power or acceleration due to improper air-fuel mixture caused by the malfunctioning secondary air injection system.</li> <li><a href="/problems/high-co-emissions-at-increased-idle"><b>Increased Emissions</b></a>: Higher emissions may be observed as the secondary air injection system is not functioning correctly, affecting the catalytic converter's efficiency.</li> </ul>

<ul><li>The AIR Pressure Sensor may be faulty, leading to incorrect readings and triggering the error code.</li><li>An open or shorted harness in the AIR Pressure Sensor can disrupt the signal, causing the system to malfunction.</li><li>Poor electrical connections in the AIR Pressure Sensor circuit can result in intermittent or weak signals, affecting system performance.</li></ul>

<ul> <li><b>Research Technical Service Bulletins (TSBs)</b>: Research TSBs for the specific vehicle by year, model, and power plant to identify any known issues related to the P2437 code.</li> <li><b>Perform Visual Inspection</b>: Conduct a thorough visual inspection of the wiring associated with the secondary air injection system for defects such as scraping, rubbing, bare wires, or burn spots.</li> <li><b>Inspect Connectors and Connections</b>: Check all connectors and connections for security, corrosion, and damaged pins, including those connected to the PCM.</li> <li><b>Verify Circuit Configuration</b>: Consult the vehicle's technical data to verify the circuit configuration and confirm all components, including any fuses or fuse-able links.</li> <li><b>Test One-Way Check Valve</b>: Test the check valve to ensure airflow is in one direction only. Ice in the pump during cold weather may indicate a defective valve.</li> <li><b>Inspect Secondary Air Injection Pump</b>: Check the secondary air injection pump for proper operation and replace if necessary.</li> <li><b>Test Air Pressure Sensor</b>: Test the air pressure sensor for proper function and replace if faulty.</li> <li><b>Inspect Air Control Solenoid Valve</b>: Inspect the air control solenoid valve for proper operation and replace if necessary.</li> <li><b>Check PCM Functionality</b>: Consider flashing or replacing the PCM if all other components are functioning correctly and the issue persists.</li></ul>

<p>The DTC P2437 indicates a <b>critical</b> issue with the Secondary Air Injection System, specifically a low air flow/pressure sensor circuit in Bank 2. This can lead to increased emissions and potential engine performance issues. <ul><li>Immediate attention is required to prevent further damage to the emission control system.</li><li>Failure to address this may result in failing emissions tests and potential legal implications.</li></ul></p>