DTC Code P1374 – What does this code mean?

<ul> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: The illumination of the engine light indicates a detected issue within the 3X reference circuit. This could be due to a malfunctioning crankshaft position sensor, damaged wiring, or a faulty ignition control module.</li> <li><b>Engine Misfire</b>: An engine misfire may occur due to incorrect timing signals from the crankshaft position sensor, leading to improper fuel and air mixture ignition.</li> <li><b>Poor Engine Performance</b>: The vehicle may experience reduced power and acceleration due to inaccurate engine timing, which can be caused by issues within the 3X reference circuit.</li> <li><b>Difficulty Starting the Engine</b>: Starting issues may arise if the crankshaft position sensor fails to provide the correct reference signals, affecting the ignition system's ability to start the engine.</li> </ul>

<ul><li>The Crankshaft Position (CKP) Sensor may be faulty, leading to incorrect or no signal being sent to the engine control module.</li><li>The CKP Sensor harness could be open or shorted, disrupting the signal transmission.</li><li>Poor electrical connection in the CKP Sensor circuit can cause intermittent or no signal.</li><li>A faulty Ignition Control Module can also result in improper signal processing from the CKP Sensor.</li></ul>

<ul> <li><b>Initial Scan</b>: Use an OBD-II scanner to confirm the presence of DTC P1374 and check for any additional codes that may be related.</li> <li><b>Visual Inspection</b>: Inspect the wiring and connectors related to the 3X reference circuit for any signs of damage, corrosion, or loose connections.</li> <li><b>Check Crankshaft Position Sensor</b>: Test the crankshaft position sensor (CKP) for proper operation using a multimeter. Verify the sensor's resistance and output voltage.</li> <li><b>Inspect Reluctor Ring</b>: Examine the reluctor ring on the crankshaft for any signs of damage, misalignment, or debris that could interfere with the sensor's signal.</li> <li><b>Test Circuit Continuity</b>: Perform a continuity test on the 3X reference circuit wiring to ensure there are no open or short circuits.</li> <li><b>Check ECM/PCM</b>: Verify that the Engine Control Module (ECM) or Powertrain Control Module (PCM) is receiving the correct signal from the CKP sensor. Reprogram or replace the ECM/PCM if necessary.</li> <li><b>Road Test</b>: After performing repairs, conduct a road test to ensure the issue is resolved and the DTC P1374 does not reappear.</li></ul>

<p>The DTC code P1374 indicates an issue with the 3X reference circuit, which is crucial for the engine's timing and ignition system. <b>Immediate actions:</b> <ul><li>Inspect the wiring and connectors for damage or corrosion.</li><li>Check the crankshaft position sensor for proper operation.</li><li>Verify the integrity of the engine control module (ECM).</li></ul> Delayed repair can lead to engine misfires and poor performance.</p>