P03xx OBD-II Codes (P0300–P0399)

100 fault codes in the P03xx range. Click any code for causes, diagnostic steps, severity, and common fixes.

P0300 critical
Random/Multiple Cylinder Misfire Detected
P0301 serious
Cylinder 1 Misfire Detected
P0302 serious
Cylinder 2 Misfire Detected
P0303 serious
Cylinder 3 Misfire Detected
P0304 serious
Cylinder 4 Misfire Detected
P0305 serious
Cylinder 5 Misfire Detected
P0306 serious
Cylinder 6 Misfire Detected
P0307 serious
Cylinder 7 Misfire Detected
P0308 serious
Cylinder 8 Misfire Detected
P0309 critical
Cylinder 9 Misfire Detected
P0310 critical
Cylinder 10 Misfire Detected
P0311 critical
Cylinder 11 Misfire Detected
P0312 critical
Cylinder 12 Misfire Detected
P0313 critical
Misfire Detected with Low Fuel
P0314 moderate
Single Cylinder Misfire -- Cylinder Not Specified
P0315 moderate
Crankshaft Position System Variation Not Learned
P0316 moderate
Engine Misfire Detected on Startup (First 1000 Revolutions)
P0317 low
Rough Road Hardware Not Present
P0318 low
Rough Road Sensor A Signal Circuit
P0319 low
Rough Road Hardware Not Present
P0320 critical
Ignition/Distributor Engine Speed Input Circuit Malfunction
P0321 moderate
Ignition/Distributor Engine Speed Input Circuit Range/Performance
P0322 critical
Ignition/Distributor Engine Speed Input Circuit No Signal
P0323 moderate
Ignition/Distributor Engine Speed Input Circuit Intermittent
P0324 moderate
Knock Control System Error
P0325 moderate
Knock Sensor 1 Circuit Malfunction (Bank 1)
P0326 moderate
Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)
P0327 moderate
Knock Sensor 1 Circuit Low (Bank 1 or Single Sensor)
P0328 moderate
Knock Sensor 1 Circuit High (Bank 1 or Single Sensor)
P0329 moderate
Knock Sensor 1 Circuit Intermittent (Bank 1 or Single Sensor)
P0330 moderate
Knock Sensor 2 Circuit Malfunction (Bank 2)
P0331 moderate
Knock Sensor 2 Circuit Range/Performance (Bank 2)
P0332 moderate
Knock Sensor 2 Circuit Low (Bank 2)
P0333 moderate
Knock Sensor 2 Circuit High (Bank 2)
P0334 moderate
Knock Sensor 2 Circuit Intermittent (Bank 2)
P0335 critical
Crankshaft Position Sensor "A" Circuit Malfunction
P0336 critical
Crankshaft Position Sensor A Circuit Range/Performance
P0337 critical
Crankshaft Position Sensor A Circuit Low
P0338 critical
Crankshaft Position Sensor A Circuit High
P0339 critical
Crankshaft Position Sensor A Circuit Intermittent
P0340 critical
Camshaft Position Sensor "A" Circuit Malfunction (Bank 1 or Single Sensor)
P0341 moderate
Camshaft Position Sensor A Circuit Range/Performance (Bank 1 or Single Sensor)
P0342 critical
Camshaft Position Sensor A Circuit Low (Bank 1 or Single Sensor)
P0343 critical
Camshaft Position Sensor A Circuit High (Bank 1 or Single Sensor)
P0344 moderate
Camshaft Position Sensor A Circuit Intermittent (Bank 1 or Single Sensor)
P0345 critical
Camshaft Position Sensor A Circuit Malfunction (Bank 2)
P0346 moderate
Camshaft Position Sensor A Circuit Range/Performance (Bank 2)
P0347 critical
Camshaft Position Sensor A Circuit Low (Bank 2)
P0348 critical
Camshaft Position Sensor A Circuit High (Bank 2)
P0349 moderate
Camshaft Position Sensor A Circuit Intermittent (Bank 2)
P0350 moderate
Ignition Coil Primary/Secondary Circuit Malfunction
P0351 moderate
Ignition Coil A Primary/Secondary Circuit Malfunction (Cylinder 1)
P0352 serious
Ignition Coil B Primary/Secondary Circuit Malfunction
P0353 moderate
Ignition Coil C Primary/Secondary Circuit Malfunction (Cylinder 3)
P0354 moderate
Ignition Coil D Primary/Secondary Circuit Malfunction (Cylinder 4)
P0355 moderate
Ignition Coil E Primary/Secondary Circuit Malfunction (Cylinder 5)
P0356 moderate
Ignition Coil F Primary/Secondary Circuit Malfunction (Cylinder 6)
P0357 moderate
Ignition Coil G Primary/Secondary Circuit Malfunction (Cylinder 7)
P0358 moderate
Ignition Coil H Primary/Secondary Circuit Malfunction (Cylinder 8)
P0359 moderate
Ignition Coil I Primary/Secondary Circuit Malfunction (Cylinder 9)
P0360 moderate
Ignition Coil J Primary/Secondary Circuit Malfunction (Cylinder 10)
P0361 moderate
Ignition Coil K (Cylinder 11) Primary/Secondary Circuit
P0362 moderate
Ignition Coil I Primary/Secondary Circuit - No Activity
P0363 moderate
Ignition Coil J Primary/Secondary Circuit
P0364 moderate
Ignition Coil J Primary/Secondary Circuit - No Activity
P0365 moderate
Ignition Coil K Primary/Secondary Circuit
P0366 moderate
Ignition Coil K Primary/Secondary Circuit - No Activity
P0367 moderate
Ignition Coil L Primary/Secondary Circuit
P0368 moderate
Ignition Coil L Primary/Secondary Circuit - No Activity
P0369 critical
Timing Reference High Resolution Signal A Too Few Pulses
P0370 critical
Timing Reference High Resolution Signal A Too Many Pulses
P0371 critical
Timing Reference High Resolution Signal A No Pulses
P0372 critical
Timing Reference High Resolution Signal A Intermittent
P0373 critical
Timing Reference High Resolution Signal B Too Few Pulses
P0374 critical
Timing Reference High Resolution Signal B Too Many Pulses
P0375 critical
Timing Reference High Resolution Signal B No Pulses
P0376 critical
Timing Reference High Resolution Signal B Intermittent
P0377 critical
Timing Reference High Resolution Signal B Pulse Width Not Within Expected Range
P0378 critical
Timing Reference High Resolution Signal B Frequency Not Within Expected Range
P0379 critical
Timing Reference High Resolution Signal B Phase Not Within Expected Range
P0380 moderate
Glow Plug/Heater Circuit A
P0381 low
Glow Plug/Heater Indicator Circuit
P0382 moderate
Glow Plug/Heater Circuit B
P0383 moderate
Glow Plug Control Module Circuit Low
P0384 moderate
Glow Plug Control Module Circuit High
P0385 critical
Crankshaft Position Sensor B Circuit
P0386 critical
Crankshaft Position Sensor B Circuit Range/Performance
P0387 critical
Crankshaft Position Sensor B Circuit Low
P0388 critical
Crankshaft Position Sensor B Circuit High
P0389 critical
Crankshaft Position Sensor B Circuit Intermittent
P0390 moderate
Camshaft Position Sensor B Circuit (Bank 2)
P0391 moderate
Camshaft Position Sensor B Circuit Range/Performance (Bank 2)
P0392 moderate
Camshaft Position Sensor B Circuit Low (Bank 2)
P0393 moderate
Camshaft Position Sensor B Circuit High (Bank 2)
P0394 moderate
Camshaft Position Sensor B Circuit Intermittent (Bank 2)
P0395 moderate
Cylinder Pressure Sensor Circuit (Bank 1)
P0396 moderate
Cylinder Pressure Sensor Circuit Range/Performance (Bank 1)
P0397 moderate
Cylinder Pressure Sensor Circuit Low (Bank 1)
P0398 moderate
Cylinder Pressure Sensor Circuit High (Bank 1)
P0399 moderate
Cylinder Pressure Sensor Circuit Intermittent (Bank 1)
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