Archives: DTC Codes

What Does Code P1538 Mean? DTC P1538 indicates an issue with the Intake Manifold Runner Control (IMRC) system on Bank 2, specifically identifying that the runner control flaps are detected as being stuck open. The IMRC system is a critical component of a variable intake manifold design, engineered to optimize airflow dynamics into the combustion […]

What Does Code P1539 Mean? DTC P1539 signifies an Overcurrent condition detected in the A/C Compressor Clutch Circuit. The Engine Control Module (ECM), or Powertrain Control Module (PCM), continuously monitors the electrical current flowing through the A/C compressor clutch circuit when the air conditioning system is requested to operate. This monitoring is typically achieved through […]

What Does Code P1540 Mean? DTC P1540 indicates an electrical malfunction within the circuit of the Air Bypass Valve (ABV). The Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), monitors the electrical characteristics of various circuits, including the ABV, to ensure proper engine operation and emissions control. In the context […]

What Does Code P1549 Mean? DTC P1549 indicates an Intake Manifold Runner Control (IMRC) Circuit Malfunction on Bank B. The Powertrain Control Module (PCM), also commonly referred to as the Engine Control Module (ECM), sets this code when it detects an electrical fault within the circuit controlling the intake manifold runners for the engine’s Bank […]

What Does Code P1550 Mean? The OBD-II diagnostic trouble code P1550 indicates a malfunction within the Power Steering Pressure Sensor (PSPS) circuit, specifically that the sensor’s output signal is “Out Of Self Test Range.” The Engine Control Module (ECM) or Powertrain Control Module (PCM) continuously monitors various sensor inputs to ensure proper engine and transmission […]

What Does Code P1565 Mean? DTC P1565, or “Speed Control Command Switch Out of Range High,” indicates that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected an anomalous electrical signal from the vehicle’s cruise control command switch circuit. The cruise control system typically operates by sending varying voltage signals to the […]

What Does Code P1566 Mean? The diagnostic trouble code P1566, “Speed Control Command Switch Out of Range Low,” indicates that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected an abnormal voltage signal from the cruise control command switch circuit. Specifically, “Out of Range Low” signifies that the voltage observed by the […]

What Does Code P1567 Mean? DTC P1567 indicates a detected fault within the Speed Control Output Circuit Continuity by the Powertrain Control Module (PCM), often referred to as the Engine Control Module (ECM). This code is specific to the cruise control system, signifying that the PCM has identified an electrical integrity issue with the circuit […]

What Does Code P1568 Mean? The OBD-II diagnostic trouble code P1568, often translated as “Speed Control Unable to Hold Speed,” indicates that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected an anomaly in the vehicle’s cruise control system. Specifically, this code signifies that while the cruise control system was engaged or […]

What Does Code P1571 Mean? Diagnostic Trouble Code (DTC) P1571, often interpreted as “Brake Switch Malfunction,” indicates that the Powertrain Control Module (PCM), also known as the Engine Control Module (ECM) or Vehicle Control Module (VCM) in some applications, has detected an implausible or erratic signal from the brake light switch circuit. The PCM monitors […]