Archives: DTC Codes

What Does Code P0411 Mean? The OBD-II diagnostic trouble code P0411 signifies an “Incorrect Flow Detected” within the Secondary Air Injection (SAI) system. This system is a crucial emissions control component, primarily active during cold engine starts. Its function is to inject fresh, ambient air directly into the exhaust stream, specifically into the exhaust manifolds, […]

What Does Code P0412 Mean? DTC P0412 signifies a malfunction within the electrical circuit of the Secondary Air Injection (SAI) System Switching Valve “A”. The Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), sets this code when it detects an electrical anomaly in the control circuit for the SAI Switching […]

What Does Code P0413 Mean? DTC P0413 signifies that the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), has detected an electrical open circuit within the Secondary Air Injection (SAI) System Switching Valve “A” circuit. The SAI system is an integral part of the vehicle’s emissions control strategy, primarily […]

What Does Code P0414 Mean? DTC P0414 signifies a detected electrical short circuit within the control circuit for the Secondary Air Injection (SAI) System Switching Valve ‘A’. The Secondary Air Injection system is a critical component of a vehicle’s emissions control strategy, primarily active during cold engine starts. Its function is to inject fresh atmospheric […]

What Does Code P0415 Mean? DTC P0415 signifies a detected electrical circuit malfunction within the Secondary Air Injection (SAI) System’s Switching Valve B. The Powertrain Control Module (PCM), also known as the Engine Control Module (ECM), monitors the electrical integrity of various components crucial for engine operation and emissions control. The SAI system is designed […]

What Does Code P0416 Mean? DTC P0416 indicates a detected open circuit within the electrical control pathway of the Secondary Air Injection (SAI) System Switching Valve “B.” The SAI system is an integral component of the vehicle’s emission control strategy, primarily active during cold engine starts. Its function is to inject fresh, ambient air directly […]

What Does Code P0417 Mean? DTC P0417 signifies that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an electrical fault in the control circuit for the Secondary Air Injection (SAI) System Switching Valve “B,” specifically indicating a shorted condition. The Secondary Air Injection system is an emissions control system designed to […]

What Does Code P0418 Mean? The diagnostic trouble code P0418 signifies a malfunction within the control circuit for the Secondary Air Injection (SAI) System Relay “A.” The SAI system is an emissions control device designed to reduce harmful exhaust emissions, particularly during cold engine starts. Its primary function is to pump fresh ambient air into […]

What Does Code P0419 Mean? DTC P0419 signifies a detected electrical malfunction within the control circuit of the Secondary Air Injection (SAI) System Relay “B”. The Engine Control Module (ECM), or Powertrain Control Module (PCM), is continuously monitoring the voltage and current within various circuits essential for emission control systems. For the SAI system, the […]

What Does Code P0420 Mean? DTC P0420, or “Catalyst System Efficiency Below Threshold (Bank 1),” signifies that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected that the catalytic converter on Bank 1 is not operating at optimal efficiency. The ECM monitors catalyst performance by comparing the oxygen sensor readings upstream (pre-catalyst, […]