Archives: DTC Codes

What Does Code P1793 Mean? DTC P1793 signifies an electrical malfunction within the Intake Air Volume Circuit, which is primarily monitored by the Engine Control Module (ECM) or Powertrain Control Module (PCM). This code specifically indicates that the signal from the Mass Air Flow (MAF) sensor, responsible for measuring the mass of air entering the […]

What Does Code P1794 Mean? DTC P1794, broadly defined as “Battery Voltage Circuit Malfunction” or “Power Supply Malfunction,” indicates that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected an irregular or out-of-range voltage within its own primary power supply circuit or a critical internal voltage reference circuit. This code is often […]

What Does Code P1795 Mean? DTC P1795 indicates an “Idle Switch Circuit Malfunction.” This code is set by the Engine Control Module (ECM) or Powertrain Control Module (PCM) when it detects an electrical fault within the circuit of the idle position switch. In many drive-by-cable throttle systems, a dedicated idle switch or a specific low-voltage […]

What Does Code P1796 Mean? DTC P1796 indicates a malfunction within the kick-down switch circuit. This code is typically set when the Powertrain Control Module (PCM), or in some architectures, the Transmission Control Module (TCM) operating as a subsystem of the PCM, detects an electrical fault within the circuit dedicated to the kick-down switch. The […]

What Does Code P1797 Mean? The diagnostic trouble code P1797 indicates that the Powertrain Control Module (PCM), or in some vehicle architectures, the Transmission Control Module (TCM), has detected an electrical malfunction within the Neutral Switch circuit. The Neutral Switch, often referred to as the Park/Neutral Position (PNP) switch or Neutral Safety Switch, is a […]

What Does Code P1798 Mean? DTC P1798 indicates a manufacturer-specific powertrain control module (PCM) detection of a malfunction within the Engine Coolant Temperature (ECT) sensor circuit. While P1XXX codes often relate to manufacturer-specific transmission or vehicle speed issues, for this specific context, P1798 signifies that the PCM has received an implausible signal from the ECT […]

What Does Code P1799 Mean? The diagnostic trouble code P1799 signifies an detected electrical malfunction within the “Hold Switch” circuit, as reported by the Powertrain Control Module (PCM) or Engine Control Module (ECM), depending on the vehicle’s architecture. This “Hold Switch” typically refers to a driver-actuated input that modifies the transmission’s shift logic, such as […]

What Does Code P1800 Mean? DTC P1800 indicates a circuit failure within the Transmission Clutch Interlock Safety Switch system. This code is primarily relevant to vehicles equipped with a manual transmission. The Clutch Pedal Position (CPP) switch, often referred to as the clutch interlock switch, is a critical safety component designed to prevent the engine […]

What Does Code P1801 Mean? Diagnostic Trouble Code (DTC) P1801 indicates an Open Circuit condition detected by the Powertrain Control Module (PCM) or Engine Control Module (ECM) within the Transmission Clutch Interlock Safety Switch circuit. This code is almost exclusively found on vehicles equipped with manual transmissions. The clutch interlock safety switch, also known as […]

What Does Code P1802 Mean? DTC P1802 signifies a detected Transmission Clutch Interlock Safety Switch Short Circuit To Battery. This code is primarily applicable to vehicles equipped with a manual transmission or an automatic transmission that incorporates a clutch pedal for specific functions, such as commercial vehicles or specific performance models. The Engine Control Module […]