Archives: DTC Codes

What Does Code P0378 Mean? DTC P0378 signifies “Timing Reference High Resolution Signal B Intermittent/Erratic Pulses.” This code specifically relates to the signal generated by a timing reference sensor, most commonly the Crankshaft Position (CKP) sensor, but potentially a Camshaft Position (CMP) sensor depending on the vehicle manufacturer’s designation of “Signal B.” The “high resolution” […]

What Does Code P0379 Mean? DTC P0379 indicates that the Engine Control Module (ECM), often referred to as the Powertrain Control Module (PCM), has detected an absence of pulses from the Timing Reference High Resolution Signal B. This specific code points to an issue with a secondary or high-resolution timing reference sensor, typically a crankshaft […]

What Does Code P0380 Mean? DTC P0380 indicates a malfunction within the Glow Plug/Heater Circuit “A”. In a diesel engine, glow plugs are critical for initiating combustion, especially during cold ambient temperatures. The Engine Control Module (ECM) or Powertrain Control Module (PCM), often in conjunction with a dedicated Glow Plug Control Module (GPCM), monitors the […]

What Does Code P0381 Mean? DTC P0381 indicates a detected malfunction within the circuit responsible for controlling or monitoring the Glow Plug/Heater Indicator Lamp, often referred to as the ‘Wait to Start’ lamp, in diesel engine vehicles. This indicator circuit is distinct from the primary glow plug heating circuit itself (which is typically covered by […]

What Does Code P0382 Mean? The diagnostic trouble code P0382 signifies an Exhaust Gas Recirculation (EGR) Flow Malfunction, specifically pertaining to a circuit integrity or performance issue within the EGR system’s “B” circuit. This code indicates that the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), has detected a […]

What Does Code P0385 Mean? DTC P0385 indicates a malfunction within the Crankshaft Position Sensor ‘B’ circuit. The Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), monitors the electrical signal generated by the Crankshaft Position (CKP) sensor. This sensor is crucial for determining engine speed (RPM) and position, which […]

What Does Code P0386 Mean? DTC P0386 signifies that the Engine Control Module (ECM), also commonly referred to as the Powertrain Control Module (PCM), has detected an anomaly in the signal range or performance from the Crankshaft Position (CKP) Sensor B circuit. Unlike a P0385 code which typically indicates a complete circuit malfunction (no signal), […]

What Does Code P0387 Mean? The diagnostic trouble code P0387 signifies a detected “Crankshaft Position Sensor B Circuit Low Input” by the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM). The Crankshaft Position (CKP) sensor is a critical component of the engine management system, responsible for monitoring the rotational speed and […]

What Does Code P0388 Mean? The diagnostic trouble code (DTC) P0388 signifies a condition where the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM), detects a Crankshaft Position Sensor B Circuit High Input. The Crankshaft Position Sensor (CKP sensor) is a critical component responsible for monitoring the rotational speed and precise […]

What Does Code P0389 Mean? DTC P0389 signifies an detected intermittent fault within the Crankshaft Position Sensor “B” circuit. The Engine Control Module (ECM) or Powertrain Control Module (PCM) utilizes the Crankshaft Position (CKP) sensor to monitor the rotational speed and precise position of the crankshaft. This data is absolutely critical for various engine management […]