Archives: DTC Codes

What Does Code P1602 Mean? DTC P1602 signifies a detected “Immobilizer/ECM Communication Error” within the vehicle’s security and engine management system. This code is generated when the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), fails to establish or maintain proper data communication with the vehicle’s immobilizer control unit. […]

What Does Code P1603 Mean? The diagnostic trouble code P1603 signifies an internal malfunction within the Electrically Erasable Programmable Read-Only Memory (EEPROM) of the Engine Control Module (ECM) or Powertrain Control Module (PCM). The EEPROM is a critical non-volatile memory component within the ECM/PCM responsible for storing essential calibration data, learned operational parameters (such as […]

What Does Code P1604 Mean? DTC P1604, often described as “Code Word Unregistered” or “Internal Control Module Malfunction,” indicates that the Engine Control Module (ECM), also referred to as the Powertrain Control Module (PCM), has detected an internal anomaly within its operational system or an unexpected state during its self-diagnostic processes. This code does not […]

What Does Code P1605 Mean? DTC P1605, often described as “Keep Alive Memory Test Failure,” signifies that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected an anomaly in its non-volatile memory circuit responsible for storing adaptive learning values. The Keep Alive Memory (KAM) is a dedicated segment within the PCM’s memory […]

What Does Code P1606 Mean? The diagnostic trouble code P1606 indicates that the Engine Control Module (ECM), often interchangeably referred to as the Powertrain Control Module (PCM), has detected an electrical malfunction within the output circuit responsible for controlling its own main power relay. This relay is a critical component, serving as the primary electrical […]

What Does Code P1607 Mean? DTC P1607 indicates a malfunction within the Malfunction Indicator Lamp (MIL) output circuit. This diagnostic trouble code signifies that the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), has detected an electrical fault in the circuit responsible for illuminating the “Check Engine” light on the vehicle’s […]

What Does Code P1608 Mean? DTC P1608 signifies an internal anomaly or malfunction within the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM). This code indicates that the ECM has performed an internal self-diagnostic check and detected a critical error in its core operational parameters, memory integrity, or processing capabilities. […]

What Does Code P1609 Mean? Diagnostic Trouble Code P1609 indicates a fault within the Diagnostic Lamp Driver circuit, specifically referencing the Malfunction Indicator Lamp (MIL), commonly known as the Check Engine Light (CEL). The Engine Control Module (ECM) or Powertrain Control Module (PCM), which often integrates this functionality, continuously monitors the electrical integrity and operational […]

What Does Code P1610 Mean? DTC P1610, often described as “SBDS Interactive Codes” or “NATS Malfunction” (Nissan Anti-Theft System), indicates a critical communication failure or an invalid signal exchange between the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), and the vehicle’s immobilizer control unit (IMMU) or the NATS system. This […]

What Does Code P1611 Mean? Diagnostic Trouble Code (DTC) P1611 is a manufacturer-specific powertrain code indicating an issue within the “SBDS Interactive Codes” system. While the precise definition can vary slightly between manufacturers, P1611 generally signifies a communication fault or an incorrect signal detected by the Engine Control Module (ECM) or Powertrain Control Module (PCM) […]