Archives: DTC Codes

What Does Code P1528 Mean? DTC P1528 indicates a detected malfunction within the electrical circuit of the Subsidiary Throttle Valve Solenoid. The Engine Control Module (ECM) or Powertrain Control Module (PCM) continuously monitors the electrical characteristics of various sensor and actuator circuits to ensure they operate within specified parameters. In the case of P1528, the […]

What Does Code P1529 Mean? DTC P1529 signifies a detected electrical circuit malfunction within the Secondary Air Injection (SCAIR) Solenoid system. The SCAIR system, sometimes referred to as the Air Pump system, is an emissions control component designed to reduce exhaust pollutants, particularly during cold engine starts. Its primary function is to inject fresh air […]

What Does Code P1530 Mean? DTC P1530 signifies an electrical malfunction within the A/C Clutch Control Circuit. The Powertrain Control Module (PCM), or Engine Control Module (ECM), is responsible for engaging the air conditioning compressor clutch. When the A/C system is requested by the HVAC control module, and all necessary conditions are met (e.g., proper […]

What Does Code P1531 Mean? DTC P1531 is a manufacturer-specific diagnostic trouble code indicating an “Invalid Test – Accelerator Pedal Movement.” This code signifies that the Powertrain Control Module (PCM), or Engine Control Module (ECM), has detected an unexpected or illogical input from the Accelerator Pedal Position (APP) sensor during a specific diagnostic test or […]

What Does Code P1532 Mean? The diagnostic trouble code (DTC) P1532 indicates an Intake Manifold Charge Control (IMCC) Circuit Malfunction on Bank B. This code is specifically related to the electrical circuit responsible for controlling the intake manifold runner control (IMRC) system on the engine cylinder bank that does not contain cylinder #1 (often referred […]

What Does Code P1533 Mean? DTC P1533 indicates an “Air Assist Injection (AAI) System Circuit Malfunction.” This code signifies that the Powertrain Control Module (PCM), also commonly referred to as the Engine Control Module (ECM), has detected an electrical fault within the circuit controlling the Air Assist Injection system. The AAI system is employed in […]

What Does Code P1534 Mean? The OBD-II diagnostic trouble code P1534, signifying “Inertia Switch Activated,” indicates that the Powertrain Control Module (PCM), or Engine Control Module (ECM) in some applications, has detected that the Inertia Fuel Shutoff (IFS) switch has tripped. The IFS switch is a critical passive safety device designed to cut electrical power […]

What Does Code P1535 Mean? The diagnostic trouble code P1535, defined as “Blower Fan Speed Circuit Range/Performance,” indicates that the Powertrain Control Module (PCM), or in some vehicle architectures, an integrated Body Control Module (BCM) or dedicated HVAC Control Module, has detected an anomalous condition within the blower fan speed control circuit. This code does […]

What Does Code P1536 Mean? DTC P1536 indicates a malfunction within the electrical circuit of the parking brake switch. The Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), monitors the electrical signal from the parking brake switch to understand its engagement status. This input is crucial for various vehicle functions, […]

What Does Code P1537 Mean? DTC P1537 indicates that the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), has detected an anomaly in the operation of the Intake Manifold Runner Control (IMRC) system for Bank 1, specifically identifying that the runners are “Stuck Open.” The IMRC system is an electro-mechanical […]