Archives: DTC Codes

What Does Code P1386 Mean? DTC P1386 signifies a detected fault within the Variable Cam Timing (VCT) or Variable Valve Timing (VVT) system, specifically indicating that the camshaft for Bank 2 is operating in an overadvanced condition relative to the Engine Control Module’s (ECM/PCM) commanded target. Bank 2 refers to the cylinder bank that does […]

What Does Code P1387 Mean? DTC P1387 signifies a detected electrical malfunction within the circuit controlling Variable Cam Timing (VCT) Solenoid #2. The Engine Control Module (ECM) or Powertrain Control Module (PCM) is engineered to continuously monitor the electrical integrity and operational parameters of various engine components, including VCT solenoids. In the context of P1387, […]

What Does Code P1388 Mean? DTC P1388 signifies a condition where the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects that the variable cam timing for Bank 2 is consistently or excessively over-retarded compared to its commanded or expected position. The Variable Valve Timing (VVT) or Variable Cam Timing (VCT) system is designed […]

What Does Code P1389 Mean? DTC P1389, which translates to “Glow Plug Circuit High Side Low Input,” indicates that the Powertrain Control Module (PCM), also referred to as the Engine Control Module (ECM), has detected an abnormal voltage condition within the glow plug control circuit. Specifically, the PCM monitors the voltage on the “high side” […]

What Does Code P1390 Mean? The OBD-II diagnostic trouble code P1390 signifies “Octane Adjust Pin Out Of Self Test Range.” This code is typically set when the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects an anomalous electrical condition on its dedicated input circuit designed for octane adjustment. In many older or specific […]

What Does Code P1391 Mean? DTC P1391, Glow Plug Circuit Low Input (Bank #1), indicates that the Powertrain Control Module (PCM), or Engine Control Module (ECM) in many diesel applications, has detected a voltage reading in the glow plug control circuit for Bank 1 that is below a predetermined calibrated threshold. In diesel engines, glow […]

What Does Code P1392 Mean? DTC P1392 signifies a detected High Input condition within the Glow Plug Circuit specific to Bank #1. This code is primarily associated with diesel engines, where glow plugs are critical for initiating combustion during cold engine starts. The Engine Control Module (ECM) or Powertrain Control Module (PCM) actively monitors the […]

What Does Code P1393 Mean? DTC P1393 indicates that the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), has detected an abnormally low voltage or current signal within the glow plug circuit for Bank 2. In diesel engine applications, glow plugs are critical heating elements designed to elevate the […]

What Does Code P1394 Mean? DTC P1394 signifies a detected “Glow Plug Circuit High Input (Bank #2)” condition. This indicates that the Powertrain Control Module (PCM), often referred to as the Engine Control Module (ECM) in diesel applications, has identified an electrical anomaly within the glow plug circuit specifically associated with Bank 2. On V-configuration […]

What Does Code P1395 Mean? The OBD-II diagnostic trouble code P1395 signifies a “Glow Plug Monitor Fault” specifically for Engine Bank #1. This code indicates that the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), has detected an inconsistency or malfunction within the glow plug monitoring circuit for the […]