Archives: DTC Codes

What Does Code P1803 Mean? DTC P1803 indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an intermittent or continuous short circuit to ground within the circuit of the Transmission Clutch Interlock Safety Switch. This switch, sometimes referred to as the Clutch Pedal Position (CPP) sensor or Manual Transmission Neutral […]

What Does Code P1804 Mean? DTC P1804 signifies that the Powertrain Control Module (PCM), or a dedicated Transfer Case Control Module (TCCM) in certain vehicle architectures, has detected an electrical malfunction within the circuit responsible for illuminating the 4-Wheel Drive High (4WD-H) indicator light on the vehicle’s instrument cluster. This code specifically points to a […]

What Does Code P1805 Mean? DTC P1805 indicates an “Open Circuit” condition detected within the electrical pathway responsible for illuminating the 4-Wheel Drive High (4WD High) indicator light on the vehicle’s instrument cluster. This code is typically set by the Powertrain Control Module (PCM) or, more commonly, the Transfer Case Control Module (TCCM) when it […]

What Does Code P1806 Mean? DTC P1806 indicates that the Powertrain Control Module (PCM), or in many applications, the Transfer Case Control Module (TCCM) or 4WD Control Module, has detected an electrical fault within the circuit controlling the 4-Wheel Drive High (4WD-H) indicator lamp. Specifically, the code signifies a “short circuit to battery” condition, meaning […]

What Does Code P1807 Mean? DTC P1807 signifies a detected “Transmission 4-Wheel Drive High Indicator Short Circuit To Ground.” This code is typically set by the Transfer Case Control Module (TCCM) or the Powertrain Control Module (PCM), depending on the vehicle architecture. The module monitors the electrical circuit for the 4-Wheel Drive High (4WD HIGH) […]

What Does Code P1808 Mean? DTC P1808 signifies an electrical circuit malfunction within the 4-Wheel Drive Low (4WD-L) indicator system. Specifically, the Powertrain Control Module (PCM), or in many applications, the Transfer Case Control Module (TCCM), has detected an anomaly in the circuit responsible for illuminating the 4WD-L indicator lamp on the vehicle’s instrument cluster. […]

What Does Code P1809 Mean? DTC P1809 signifies an detected open circuit within the electrical pathway dedicated to the 4-Wheel Drive Low (4WD Low) indicator lamp. In modern automotive architectures, the Powertrain Control Module (PCM), or in some instances a dedicated Transfer Case Control Module (TCCM) which communicates with the PCM, actively monitors the electrical […]

What Does Code P1810 Mean? The OBD-II diagnostic trouble code P1810 signifies a detected fault within the Transmission Fluid Pressure (TFP) Valve Position Switch Circuit or the Transmission 4-Wheel Drive Low Indicator Circuit, specifically indicating a short circuit to battery voltage. This code is commonly associated with General Motors vehicles equipped with electronically controlled automatic […]

What Does Code P1811 Mean? DTC P1811 indicates a detected short circuit to ground within the 4-Wheel Drive Low (4WD Low) indicator lamp circuit. This is typically a manufacturer-specific powertrain code that points to an electrical anomaly monitored by the Powertrain Control Module (PCM) or, in some applications, a dedicated Transfer Case Control Module (TCCM). […]

What Does Code P1812 Mean? The P1812 diagnostic trouble code signifies a detected malfunction within the electrical circuit responsible for selecting the various 4-wheel drive (4WD) operational modes. This circuit typically involves the 4WD mode selector switch (often located on the dashboard or center console), the transfer case control module (TCCM), and the interconnecting wiring […]