P0300

Random/Multiple Cylinder Misfire Detected

P0301

Cylinder 1 Misfire Detected

P0302

Cylinder 2 Misfire Detected

P0303

Cylinder 3 Misfire Detected

P0304

Cylinder 4 Misfire Detected

P0305

Cylinder 5 Misfire Detected

P0306

Cylinder 6 Misfire Detected

P0307

Cylinder 7 Misfire Detected

P0308

Cylinder 8 Misfire Detected

P0309

Cylinder 9 Misfire Detected

P0310

Cylinder 10 Misfire Detected

P0311

Cylinder 11 Misfire Detected

P0312

Cylinder 12 Misfire Detected

P0313

Misfire Detected with Low Fuel

P0314

Single Cylinder Misfire (Cylinder not Specified)

P0320

Ignition/Distributor Engine Speed Input Circuit Malfunction

P0321

Ignition/Distributor Engine Speed Input Circuit Range/Performance

P0322

Ignition/Distributor Engine Speed Input Circuit No Signal

P0323

Ignition/Distributor Engine Speed Input Circuit Intermittent

P0325

Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)

P0326

Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)

P0327

Knock Sensor 1 Circuit low Input (Bank 1 or Single Sensor)

P0328

Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

P0329

Knock Sensor 1 Circuit Input Intermittent (Bank 1 or Single Sensor)

P0330

Knock Sensor 2 Circuit Malfunction (Bank 2)

P0331

Knock Sensor 2 Circuit Range/Performance (Bank 2)

P0332

Knock Sensor 2 Circuit Low Input (Bank 2)

P0333

Knock Sensor 2 Circuit High Input (Bank 2)

P0334

Knock Sensor 2 Circuit Input Intermittent (Bank 2)

P0335

Crankshaft Position Sensor A Circuit Malfunction

P0336

Crankshaft Position Sensor A Circuit Range/Performance

P0337

Crankshaft Position Sensor A Circuit Low Input

P0338

Crankshaft Position Sensor A Circuit High Input

P0339

Crankshaft Position Sensor A Circuit Intermittent

P0340

Camshaft Position Sensor Circuit Malfunction

P0341

Camshaft Position Sensor Circuit Range/Performance

P0342

Camshaft Position Sensor Circuit Low Input

P0343

Camshaft Position Sensor Circuit High Input

P0344

Camshaft Position Sensor Circuit Intermittent

P0350

Ignition Coil Primary/Secondary Circuit Malfunction

P0351

Ignition Coil A Primary/Secondary Circuit Malfunction

P0352

Ignition Coil B Primary/Secondary Circuit Malfunction

P0353

Ignition Coil C Primary/Secondary Circuit Malfunction

P0354

Ignition Coil D Primary/Secondary Circuit Malfunction

P0355

Ignition Coil E Primary/Secondary Circuit Malfunction

P0356

Ignition Coil F Primary/Secondary Circuit Malfunction

P0357

Ignition Coil G Primary/Secondary Circuit Malfunction

P0358

Ignition Coil H Primary/Secondary Circuit Malfunction

P0359

Ignition Coil I Primary/Secondary Circuit Malfunction

P0360

Ignition Coil J Primary/Secondary Circuit Malfunction

P0361

Ignition Coil K Primary/Secondary Circuit Malfunction

P0362

Ignition Coil L Primary/Secondary Circuit Malfunction

P0370

Timing Reference High Resolution Signal A Malfunction

P0371

Timing Reference High Resolution Signal A Too Many Pulses

P0372

Timing Reference High Resolution Signal A Too Few Pulses

P0373

Timing Reference High Resolution Signal A Intermittent/Erratic Pulses

P0374

Timing Reference High Resolution Signal A No Pulses

P0375

Timing Reference High Resolution Signal B Malfunction

P0376

Timing Reference High Resolution Signal B Too Many Pulses

P0377

Timing Reference High Resolution Signal B Too Few Pulses

P0378

Timing Reference High Resolution Signal B Intermittent/Erratic Pulses

P0379

Timing Reference High Resolution Signal B No Pulses

P0380

Glow Plug/Heater Circuit “A” Malfunction

P0381

Glow Plug/Heater Indicator Circuit Malfunction

P0382

Glow Plug/Heater Circuit “B” Malfunction

P0385

Crankshaft Position Sensor B Circuit Malfunction

P0386

Crankshaft Position Sensor B Circuit Range/Performance

P0387

Crankshaft Position Sensor B Circuit Low Input

P0388

Crankshaft Position Sensor B Circuit High Input

P0389

Crankshaft Position Sensor B Circuit Intermittent

Random/Multiple Cylinder Misfire Detected

Description:

How does a P0300 code trigger the check engine light? This code will trigger the check engine light as follows:

The misfire detection monitor, a software strategy built into the computer, is designed to detect an engine misfire. The computer can also normally identify the specific cylinder in which the misfire has occurred. A misfire is nothing more than a lack of combustion, which can be caused by poor fuel quality or metering, low compression, lack of spark or unmetered air entering the engine. There are other possible, less obvious causes as well, such as uncommanded Exhaust Gas Recirculatin (EGR), flow. When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc. In this case we have either multiple cylinders misfiring, or the computer simply can’t determine the specific cylinder, and as such we are left with the P0300 in computer memory.

Possible Causes:

Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

Diagnostic Help:

To diagnose a P0300 trouble code we begin by checking for proper fuel and ignition system operation, and then follow up with the less likely causes listed above, such as EGR and EVAP system problems. New style coil on plug applications have a high failure rate, and can be concluded faulty by swapping to another cylinder and checking to see if the misfire moves to that cylinder. This is a quick check if a capable scan tool or oscilloscope is not available. Always make sure the basic maintenance is done first and that things such as the fuel filter, air filter, spark plugs and spark plug wires are in good working order, as these are all possible candidates for a problem. If necessary, check for wiring and component concerns. See our article Automotive Circuit Testing 101, if you need more assistance with this. If concern is determined to be intermittent, check out our article on intermittent diagnosis and wiggle test connectors and wiring, attempting to duplicate concern. You may also use the “Get Help” link if you need specifications or have any other related questions. Remember to refer to an appropriate manual for specific instruction.

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