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P0323 means “Ignition/Distributor Engine Speed Input Circuit Intermittent.” It is a generic OBD2 powertrain trouble code indicating that the PCM has detected an intermittent problem with the engine-speed input signal. The engine-speed signal is important because the PCM uses it to determine engine RPM and crankshaft position. Depending on the vehicle, the signal may come from a crankshaft position sensor, camshaft position sensor, distributor pickup, ignition reference circui

P0322 means “Ignition/Distributor Engine Speed Input Circuit Low.” It is a generic OBD2 powertrain trouble code indicating that the PCM has detected an engine-speed input signal that is lower than the expected level. The engine-speed signal may come from a crankshaft position sensor (CKP), camshaft position sensor (CMP), distributor pickup, or another ignition/engine-speed input system, depending on the vehicle. The PCM relies on this information to determine engine speed and

P0321 means “Ignition/Distributor Engine Speed Input Circuit Range/Performance.” It is a generic OBD2 powertrain trouble code indicating that the PCM or ECM has detected an engine-speed input signal that is not performing within its expected range. The engine-speed signal is important because the control module uses it to determine engine RPM and crankshaft position. Depending on the vehicle, this information may come from a crankshaft position sensor (CKP), camshaft position

P0319 means “Rough Road Sensor B Signal Circuit.” It is a generic OBD2 powertrain trouble code indicating that the PCM has detected a problem with the signal from the vehicle's rough-road sensor B circuit. The rough-road detection system helps the PCM determine whether changes in crankshaft speed are caused by a genuine engine misfire or by the vehicle traveling over an uneven road. Depending on the vehicle, rough-road information may come from a dedicated accelerometer or se

P0318 means “Rough Road Sensor A Signal Circuit.” It is a generic OBD2 powertrain trouble code indicating that the PCM has detected a problem with the electrical signal from rough-road sensor A or the related rough-road detection circuit. The rough-road detection system helps the PCM determine whether changes in crankshaft speed are caused by an actual engine misfire or by the vehicle traveling over an uneven surface. Depending on the vehicle, rough-road information may come

P0317 means “Rough Road Hardware Not Present.” It is a generic OBD2 powertrain trouble code indicating that the PCM has detected that the vehicle's system for identifying rough-road conditions is missing, unavailable, or not operating as expected. Modern vehicles may use a dedicated rough-road sensor, accelerometer, wheel-speed sensors, or information from the ABS/EBCM system to determine whether the vehicle is traveling over an uneven surface. This information is important b

P0316 means “Misfire Detected on Startup — First 1,000 Revolutions.” It is a generic OBD2 powertrain trouble code indicating that the PCM has detected an engine misfire shortly after the engine starts, specifically within the first 1,000 crankshaft revolutions. P0316 does not identify one particular cylinder. Instead, it tells you that the engine experienced a misfire during the initial period after startup. This code may appear together with another misfire code, such as P03

P0314 means “Single-Cylinder Misfire Detected — Cylinder Not Specified.” It is a generic OBD2 powertrain trouble code indicating that the engine computer has detected a misfire affecting one cylinder but has not identified which cylinder is responsible. Unlike codes such as P0301, P0302, or P0312, P0314 does not tell you the exact cylinder. That means diagnosis requires additional testing to determine where the misfire is occurring. A single-cylinder misfire can be caused by

What Does P0313 Mean? P0313 means “Misfire Detected With Low Fuel.” It is a generic OBD2 powertrain trouble code indicating that the engine computer detected a misfire while the fuel level or fuel delivery condition was low. Unlike cylinder-specific codes such as P0301 or P0312, P0313 does not identify one particular cylinder. The problem may occur because the fuel level becomes low enough for the fuel pump to have difficulty maintaining consistent fuel delivery. However, P03

What Does P0312 Mean? P0312 means “Cylinder 12 Misfire Detected.” It is a generic OBD2 powertrain trouble code that indicates the engine computer has detected a misfire in cylinder 12. The code identifies the affected cylinder but does not automatically identify the failed component. Cylinder 12 is found only on engines with enough cylinders, and cylinder numbering varies between engine designs. Always confirm the cylinder location using the vehicle's service information befo