Archives: DTC Codes

What Does Code P1660 Mean? The diagnostic trouble code P1660, generally described as “Output Circuit Check Signal High,” indicates that the Powertrain Control Module (PCM), also commonly referred to as the Engine Control Module (ECM), has detected an abnormally high voltage on a dedicated feedback or monitoring circuit associated with one of its controlled output […]

What Does Code P1661 Mean? The diagnostic trouble code P1661, often defined as “Output Circuit Check Signal Low,” indicates that the Powertrain Control Module (PCM), also referred to as the Engine Control Module (ECM), has detected an anomaly in a specific output circuit’s feedback loop. The PCM commands various actuators, relays, or solenoids to perform […]

What Does Code P1662 Mean? DTC P1662 signifies an observed malfunction within the Injection Driver Module (IDM) Enable (IDM_EN) circuit. This code is most commonly associated with Ford diesel engines, particularly the 7.3L Power Stroke, where a dedicated Injection Driver Module (IDM) is utilized to power and control the fuel injectors. The Powertrain Control Module […]

What Does Code P1663 Mean? The P1663 diagnostic trouble code signifies a malfunction within the Fuel Demand Command Signal Circuit. This circuit is an integral part of the powertrain’s electronic fuel delivery system, specifically governing the precise control of fuel pressure and volume. The Engine Control Module (ECM), also known as the Powertrain Control Module […]

What Does Code P1667 Mean? DTC P1667 signifies a detected malfunction within the Charge Indicator (CI) Circuit. In automotive systems, particularly prevalent in Ford vehicles, the CI circuit is a dedicated electrical pathway that allows the Powertrain Control Module (PCM) or Engine Control Module (ECM) to monitor and control the vehicle’s charging system warning lamp […]

What Does Code P1668 Mean? DTC P1668 signifies a communication error between the Powertrain Control Module (PCM) and the Injection Driver Module (IDM). This code is predominantly found in diesel-powered vehicles, particularly Ford models equipped with a separate IDM, such as the 7.3L and 6.0L Power Stroke engines. The PCM is the central control unit […]

What Does Code P1670 Mean? DTC P1670, defined as “Electronic Feedback Signal Not Detected,” is a manufacturer-specific powertrain diagnostic trouble code indicating that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has failed to receive an expected electronic feedback signal from a monitored system. This signal is crucial for the ECM/PCM to verify […]

What Does Code P1680 Mean? The diagnostic trouble code P1680 signifies a malfunction within the Metering Oil Pump (MOP) system. This code is specifically relevant for vehicles equipped with a dedicated MOP, primarily rotary engines (e.g., Mazda Renesis in the RX-8) or certain diesel engine applications that require precise, supplemental lubrication of combustion chamber components. […]

What Does Code P1681 Mean? DTC P1681 signifies a detected malfunction within the Metering Oil Pump (MOP) system. This code is typically set by the Engine Control Module (ECM) or Powertrain Control Module (PCM) when it identifies an issue with the MOP’s electrical circuit, mechanical operation, or its ability to deliver the specified amount of […]

What Does Code P1682 Mean? DTC P1682 indicates a detected malfunction within the Metering Oil Pump (MOP) circuit. In most applications, particularly in vehicles utilizing rotary engines such as those found in Mazda RX-8 models (13B-MSP Renesis engine), the MOP is an electronically controlled pump responsible for injecting precise quantities of engine oil directly into […]