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The P1391 trouble code is a diagnostic trouble code (DTC) that indicates an intermittent loss of signal from either the crankshaft position sensor (CKP) or the camshaft position sensor (CMP). This code is commonly encountered in various vehicles, particularly those manufactured by Chrysler, Dodge, and Jeep. When this code is triggered, it typically signifies that the engine control module (ECM) is not receiving consistent signals

The P0641 trouble code is a diagnostic trouble code (DTC) that indicates an issue with the “Sensor Reference Voltage ‘A’ Circuit.” This code is triggered when the Powertrain Control Module (PCM) detects a voltage reading from the 5-volt reference circuit that does not meet manufacturer specifications. The 5V reference circuit is crucial for powering various engine sensors, and when it malfunctions, it can lead to

The P0731 trouble code signifies a malfunction within the vehicle’s transmission system, specifically indicating a “Gear 1 Incorrect Ratio.” This code is triggered when the powertrain control module (PCM) detects a discrepancy between the input and output speed sensors in first gear, suggesting that the transmission is not functioning as intended. Understanding this code is crucial for vehicle owners and DIY mechanics, as it can

The P0151 trouble code is a diagnostic trouble code (DTC) that indicates an issue with the oxygen sensor circuit, specifically for Bank 2, Sensor 1. This code is triggered when the Engine Control Module (ECM) detects that the voltage from the oxygen sensor remains below the specified threshold, indicating a potential malfunction in the sensor or its circuit. Understanding this code is crucial for vehicle

The P1298 trouble code is a diagnostic trouble code (DTC) indicating an issue with the Electric Load Detection (ELD) circuit in vehicles, particularly common in Honda models. This code signifies that the Engine Control Module (ECM) has detected a high voltage condition in the ELD circuit, which is responsible for monitoring electrical loads and adjusting the alternator’s output accordingly. When this system malfunctions, it can

The P0725 trouble code indicates a malfunction in the engine speed input circuit, which is critical for the proper functioning of the vehicle’s transmission system. This code is part of the OBD-II diagnostic system and is logged when the transmission control module (TCM) does not receive a valid signal regarding engine speed from the engine control module (ECM). The engine speed input is essential for

The P1174 trouble code is a diagnostic trouble code (DTC) that indicates a fuel trim imbalance in a vehicle’s engine management system. Specifically, it suggests that the Powertrain Control Module (PCM) has detected an issue with the air-fuel mixture across the cylinders, which can lead to poor engine performance, increased emissions, and reduced fuel efficiency. This code is commonly associated with various makes and models,

The P1258 trouble code is a diagnostic trouble code (DTC) that indicates an engine coolant overtemperature condition. Specifically, this code is triggered when the Powertrain Control Module (PCM) detects that the engine coolant temperature has exceeded a critical threshold, typically around 132°C (270°F), for an extended period. When this occurs, the PCM activates a protective mode to prevent engine damage by disabling fuel injectors in

The P1778 trouble code is a diagnostic trouble code (DTC) that indicates a malfunction within the step motor circuit of a vehicle’s continuously variable transmission (CVT). This code is typically associated with Nissan vehicles, where it signifies that the powertrain control module (PCM) has detected an issue with the stepper motor responsible for controlling gear changes. The step motor is crucial for adjusting the active

The P0315 trouble code is a diagnostic trouble code (DTC) that indicates a problem with the crankshaft position system, specifically that the variation in the crankshaft position has not been learned by the powertrain control module (PCM). This code is crucial as it can affect engine performance, fuel efficiency, and overall vehicle functionality. Understanding and addressing this code is essential for vehicle owners and DIY