P0300-P0399
P0300-P0399

P0300-P0399 – Ignition System or Misfire. OBD-II

  • P0300 Random/Multiple Cylinder Misfire Detected

A code ( P0300 – P0312 ) may mean that one or more of the following has happened:

  1. Faulty spark plugs or wires
  2. Faulty coil (pack)
  3. Faulty oxygen sensor(s)
  4. Faulty fuel injector(s)
  5. Burned exhaust valve
  6. Faulty catalytic converter(s)
  7. Stuck/blocked/leaking EGR valve / passages
  8. Faulty camshaft position sensor
  9. Defective computer

Low Compression Causing Engine Misfires – Is It A Mechanical Malfunction

  • 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)
  • P0315 Crankshaft Position System Variation Not Learned
  • P0316 Misfire Detected On Startup (First 1000 Revolutions)
  • P0317 Rough Road Hardware Not Present
  • P0318 Rough Road Sensor A Signal Circuit
  • P0319 Rough Road Sensor B Signal Circuit
  • 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
  • P0324 Knock Control System Error
  • If the knock sensor or associated wiring has failed or broken, you may see some of the following knock sensor related automotive repair trouble codes: P0325 – P0326 – P0327 – P0328 – P0329 – P0330 – P0331 – P0332 – P0333 – P0334
  • P0325 Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)

What Does P0325 Code Mean?

OBD-II Code P0325 is defined as a Knock Sensor #1 – Circuit Malfunction (Single Sensor or Bank 1)

The purpose of the knock sensor is to alert the PowerTrain Control Module or PCM that the engine is pinging or knocking. This is important because a pinging or knocking engine pollutes the air with poisonous Nitrogen Oxide gases that cause acid rain and promote respiratory diseases such as asthma.
Code P0325 indicates that the readings from the #1 Knock Sensor circuit are too low, too high, erratic or in some way outside of its operational window and malfunctioning.

P0325 Symptoms

  • Check Engine Light will illuminate
  • Engine pings on acceleration
  • Engine may be running hotter than normal
  • In rare cases, the engine may not exhibit noticeable symptoms

Common Problems That Trigger the P0325 Code

  • Defective Knock Sensor
  • Defective Knock Sensor Circuit or connections
  • Defective EGR System
  • Malfunctioning Cooling System
  • Lean air/fuel ratio

Common Misdiagnosis

  • Knock Sensor replaced when cause of code P0325 was a cooling system problem
  • Knock Sensor replaced when cause of code P0325 was an EGR system malfunction
Want to learn more?
The PowerTrain Control Module or PCM controls the degree of ignition system spark advance in order to achieve maximum power and fuel economy. When the knock sensor signals the PowerTrain Control Module or PCM that the engine is pinging or knocking, the first thing the PCM does is change the amount of timing advance by retarding it in controlled increments, until the knock sensor stops signaling the PCM that the engine is pinging.
P0325 Diagnostic Theory for Shops and Technicians
Code P0325 is triggered because the PCM knows that the signal from the #1 knock sensor circuit is outside of its normal operational window, is malfunctioning and/or there is an extraordinary engine condition. Capture and document the freeze frame data so you have an idea of what operational conditions were present when the PCM triggered the P0325 code. Then do a visual inspection of the engine and cooling system, coolant level/condition and oil level/condition to verify that code P0325 wasn’t caused by a failure of a mechanical system. Then start the engine and rev it a few times to see that it operates normally, making sure there isn’t a severe mechanical condition such that, driving the vehicle could cause further damage. Test drive the vehicle with a data streaming scanner and pay close attention to the #1 Knock Sensor PID and the PID for timing advance. How is the knock sensor #1 circuit operating? Is it sending/not sending signals when the engine is pinging or not pinging? If so, find out why. Sometimes I bring the car back to the service bay and tap the engine with a small hammer and watch the knock sensor PID as well as the PID for timing advance.

  • 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 Intermittent (Bank 1 or Single Sensor)
  • P032A Knock Sensor 3 Circuit Bank 1
  • P032B Knock Sensor 3 Circuit Range/Performance Bank 1
  • P032C Knock Sensor 3 Circuit Low Bank 1
  • P032D Knock Sensor 3 Circuit High Bank 1
  • P032E Knock Sensor 3 Circuit Intermittent Bank 1
  • 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 Intermittent (Bank 2)
  • Crankshaft Position Sensor-(CPS)-Testing And Replacement

  • 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
  • P033A Knock Sensor 4 Circuit (Bank 2)
  • P033B Knock Sensor 4 Circuit Range/Performance (Bank 2)
  • P033C Knock Sensor 4 Circuit Low (Bank 2)
  • P033D Knock Sensor 4 Circuit High (Bank 2)
  • P033E Knock Sensor 4 Circuit Intermittent (Bank 2)
  • P0340 Camshaft Position Sensor Circuit Malfunction (Bank 1)
  • P0341 Camshaft Position Sensor Circuit Range/Performance (Bank 1)
  • P0342 Camshaft Position Sensor A Circuit Low Input (Bank 1)
  • P0343 Camshaft Position Sensor A Circuit High Input (Bank 1)

  • P0344 Camshaft Position Sensor A Circuit Intermittent (Bank 1)
  • What Does P0344 Code Mean?

    OBD-II Code P0344 is defined as a Camshaft Position Sensor Circuit Intermittent

    The Camshaft Position Sensor measures the exact rotational position of the camshaft in relation to the Crankshaft. This provides a critical data signal used by the Powertrain Control Module (PCM) to control Ignition Spark and Fuel Injector Timing. From the year 2000, the Camshaft Sensor is responsible for providing critical data to the Variable Valve Timing System which increases power and fuel economy while lowering emissions. When this signal is interrupted for any reason, code P0344 is set and the MIL or Check Engine Light is illuminated.

    P0344 Symptoms

    • Check Engine Light will illuminate
    • Hard starting/cranking without starting
    • Engine hesitation or stalling
    • Engine dies and will not re-start
    • Metallic, rattling engine noises
    • In many cases, no abnormal symptoms may be noticed

    Common Problems That Trigger the P0344 Code

    • Defective Camshaft Position Sensor
    • Faulty or corroded Camshaft Position Sensor wiring or connections
    • Defective Crankshaft Position Sensor
    • Rough running/misfiring Engine
    • Stretched Timing Chain or Timing Belt
    • Jumped Timing Chain or Belt
    • Metallic and/or rattling engine noises.

    Common Misdiagnoses

    • Camshaft Position Sensor is replaced when the cause is a defective Crankshaft Position Sensor
    • Camshaft Position Sensor is replaced when the cause is a poor connection or chafed wiring
    • Camshaft Position Sensor is replaced when the cause is a misfiring engine
    • Camshaft Position Sensor is replaced when the cause is a defective Timing Component

  • P0345 Camshaft Position Sensor A Circuit Malfunction (Bank 2)
  • P0346 Camshaft Position Sensor A Circuit Range/Performance (Bank 2)
  • P0347 Camshaft Position Sensor A Circuit Low Input (Bank 2)
  • P0348 Camshaft Position Sensor A Circuit High Input (Bank 2)
  • P0349 Camshaft Position Sensor A Circuit Intermittent (Bank 2)
  • 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
  • P0363 Misfire Detected – Fueling Disabled
  • P0365 Camshaft Position Sensor “B” Circuit (Bank 1)
  • P0366 Camshaft Position Sensor “B” Circuit Range/Performance (Bank 1)
  • P0367 Camshaft Position Sensor “B” Circuit Low (Bank 1)
  • P0368 Camshaft Position Sensor “B” Circuit High (Bank 1)
  • P0369 Camshaft Position Sensor “B” Circuit Intermittent (Bank 1)
  • 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
  • P037D Glow Plug Sense Circuit
  • P037E Glow Plug Sense Circuit Low
  • P037F Glow Plug Sense Circuit High
  • P0380 Glow Plug/Heater Circuit “A”
  • P0381 Glow Plug/Heater Indicator Circuit Malfunction
  • P0382 Glow Plug/Heater Circuit “B”
  • P0383 Glow Plug Control Module Control Circuit Low
  • P0384 Glow Plug Control Module Control Circuit High
  • 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
  • P0390 Camshaft Position Sensor “B” Circuit (Bank 2)
  • P0391 Camshaft Position Sensor “B” Circuit Range/Performance (Bank 2)
  • P0392 Camshaft Position Sensor “B” Circuit Low (Bank 2)
  • P0393 Camshaft Position Sensor “B” Circuit High (Bank 2)
  • P0394 Camshaft Position Sensor “B” Circuit Intermittent (Bank 2)
  • P0300-P0399