Archives: DTC Codes

What Does Code P1769 Mean? The OBD-II diagnostic trouble code P1769 specifically indicates an “AG4 Transmission Torque Modulation Fault.” This code is set by the Powertrain Control Module (PCM) or the Transmission Control Module (TCM), often found in Saab, Opel, and certain GM vehicles utilizing the AG4 automatic transmission. Torque modulation is a critical function […]

What Does Code P1770 Mean? The OBD-II diagnostic trouble code P1770 indicates a “Clutch Solenoid Circuit Malfunction.” This code is typically set by the Powertrain Control Module (PCM) or Transmission Control Module (TCM) in vehicles equipped with electronically controlled clutch systems, most commonly found in Continuously Variable Transmissions (CVTs) or advanced automated manual transmissions (AMTs). […]

What Does Code P1775 Mean? DTC P1775 signifies a general “Transmission System MIL Fault” detected by the Powertrain Control Module (PCM) or Transmission Control Module (TCM). This code indicates a critical malfunction within the transmission system that necessitates the illumination of the Malfunction Indicator Lamp (MIL). Unlike more specific transmission codes (e.g., P07xx series), P1775 […]

What Does Code P1776 Mean? DTC P1776, commonly associated with Nissan vehicles equipped with Continuously Variable Transmissions (CVTs), signifies an “Ignition Retard Request Duration Fault,” though its root cause is primarily a malfunction within the transmission’s hydraulic control system, specifically the Torque Converter Clutch (TCC) solenoid valve circuit or function. The Powertrain Control Module (PCM), […]

What Does Code P1777 Mean? DTC P1777, often described as an “Ignition Retard Request Circuit Fault,” indicates that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected an electrical malfunction within the dedicated circuit responsible for requesting ignition timing retard. This code does not necessarily signify a fault in the actual ignition […]

What Does Code P1778 Mean? DTC P1778 signifies a malfunction within the Transmission Reverse Input (I/P) Circuit. This code indicates that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected an electrical anomaly in the circuit responsible for signaling the engagement of the reverse gear. Specifically, the PCM monitors the voltage or […]

What Does Code P1779 Mean? The OBD-II diagnostic trouble code P1779 typically signifies a TCIL Circuit Malfunction. TCIL generally stands for Transmission Control Indicator Lamp or Transmission Control Module (TCM) Indicator Lamp. This code indicates that the Powertrain Control Module (PCM), or in some architectures the Engine Control Module (ECM) interacting with the TCM, has […]

What Does Code P1780 Mean? The OBD-II diagnostic trouble code P1780, defined as Trans Control Switch (O/D Cancel) Out of Self Test Range, indicates that the Powertrain Control Module (PCM) or Transmission Control Module (TCM) has detected an electrical anomaly within the circuit for the Overdrive (O/D) Cancel switch. This switch, typically located on the […]

What Does Code P1781 Mean? DTC P1781, which translates to “4X4 Switch Out of Self Test Range,” indicates that the Powertrain Control Module (PCM) or, more commonly, the Transfer Case Control Module (TCCM) has detected an anomaly in the electrical signal provided by the 4-wheel drive mode selector switch. This switch, typically located on the […]

What Does Code P1782 Mean? DTC P1782 indicates that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected an anomaly in the electrical circuit associated with the Power Steering (P/S) system, specifically that the circuit’s output has fallen “Out Of Self Test Range.” While the exact circuit can vary slightly by manufacturer […]