P0174 System Too Lean Bank 2 Ford Explorer: Vacuum Leak Diagnosis and Complete Fix Guide
P0174 on a Ford Explorer means the ECM has detected that the air-fuel mixture on Bank 2 (the passenger side of the engine) is running lean: there is too much air or too little fuel: and the most common cause on Explorer trucks is a cracked or disconnected PCV hose, an intake manifold gasket leak, […]
P0191 Fuel Rail Pressure Range Performance Ford Powerstroke 6.0: Diagnosis and What Actually Fails
P0191 on a Ford 6.0L Powerstroke diesel means the PCM has detected that actual fuel rail pressure does not match the expected pressure: fluctuating outside the acceptable range relative to engine demand: and on the 6.0L specifically, this code has a distinct set of causes that differ from other diesel platforms because the 6.0L uses […]
P0193 Fuel Rail Pressure Sensor Circuit High Input Ford F-250: Diagnosis, Causes, and Repair
P0193 on a Ford F-250 means the PCM has detected that the fuel rail pressure sensor’s voltage output is above the expected range: which almost always indicates either a failed fuel rail pressure sensor sending a falsely high voltage, a wiring short to a voltage source in the sensor circuit, or in rarer cases a […]
P0304 and P0300 Random Misfire Toyota 4Runner Coil Pack Failure: Exact Diagnosis and Fix
When a Toyota 4Runner shows both P0304 (cylinder 4 misfire) and P0300 (random multiple misfire) simultaneously, the combination almost always points to a failed ignition coil on cylinder 4 that is severe enough to cause both a cylinder-specific misfire and overflow into the PCM’s random misfire detection threshold: and on the 4.0L 1GR-FE V6 4Runner, […]
P0304 Cylinder 4 Misfire Hyundai Elantra: Coil or Spark Plug: How to Diagnose and Fix It Correctly
P0304 on a Hyundai Elantra means the ECM has detected a misfire specifically in cylinder 4, which is most commonly caused by a failed ignition coil (coil-on-plug), a worn or fouled spark plug, or on direct-injection Elantra models, carbon buildup on the intake valve of cylinder 4 disrupting the air-fuel mixture. The coil-swap test: moving […]
P0335 Crankshaft Position Sensor Subaru Forester No Start: Complete Diagnosis and Fix Guide
A P0335 trouble code on a Subaru Forester means the engine control unit (ECU) has lost the signal from the crankshaft position sensor (CKP sensor): and without this signal, the ECU cannot determine where the crankshaft is in its rotation, which means it cannot time fuel injection or ignition spark, resulting in a no-start or […]
P0380 Glow Plug Heater Circuit Chevy Duramax Diesel Hard Start: Complete Diagnosis and Fix Guide
P0380 on a Chevy Duramax diesel means the PCM has detected a fault in the glow plug heater circuit: the system that preheats the combustion chamber before cold starts: and the most common causes are a failed glow plug control module (GPCM), one or more failed individual glow plugs, or a wiring fault in the […]
P0351 Ignition Coil A Primary Secondary Circuit Ford Mustang: Diagnosis, Causes, and Repair
P0351 on a Ford Mustang means the PCM has detected a fault in the primary or secondary circuit of the ignition coil assigned to cylinder 1 (Coil A): the most common cause is a failed coil-on-plug assembly on cylinder 1, which can be confirmed in under 20 minutes using the coil swap test, but the […]
P0480 Cooling Fan Relay 1 Control Circuit Dodge Charger Overheating: Complete Diagnosis and Fix Guide
P0480 on a Dodge Charger means the PCM has detected a malfunction in the control circuit for cooling fan relay 1: which controls the primary electric cooling fan: and on Charger models this most commonly results from a failed fan control module, a burned-out cooling fan motor, a blown fuse in the fan circuit, or […]
P0562 System Voltage Low GMC Sierra: Alternator or Battery: Complete Diagnosis Guide
P0562 on a GMC Sierra means the ECM has detected battery or system voltage below approximately 10.0 volts for longer than 30 consecutive seconds: and on Sierra trucks this is most commonly caused by a failing alternator that can no longer maintain charging voltage, a battery that has lost capacity and cannot hold charge, or […]