Code Definition

P1300 — Random Misfire

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Isuzu

About P1300

P1300 is a manufacturer-specific powertrain diagnostic trouble code recorded for Isuzu vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1300 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The ECM monitors crankshaft speed variations to detect combustion misfires across the engine. DTC P1300 sets when the ECM detects a random or multiple cylinder misfire that is not isolated to a single cylinder, meaning the engine is misfiring intermittently across more than one cylinder. Because the misfire is random, the cause is usually something that affects all cylinders together, such as a vacuum leak, a fuel delivery shortfall, low fuel pressure, an EGR fault, or a base ignition problem, rather than a single failed component. The driver may notice rough running, a shaking idle, hesitatio...

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