2014 Dodge Dart CEL with P0299 and P0300 Codes - Troubleshooting Guide
Hi, I'm having an issue with my 2014 Dodge Dart Aero (approximately 165,600 miles). I drive this car primarily to cover car payments and manage financial obligations at the moment. Last night, while driving home on the Interstate at speeds of 65-70 mph, my vehicle began struggling to maintain speed and had difficulty shifting, especially during upshifts. It could only sustain speeds between 45-50 mph before experiencing gear transition issues. I managed to get safely back home. I recently performed an oil change because the oil life was at 0%. Shortly after, my Check Engine Light (CEL) activated. Due to scheduling constraints, I couldn't visit a mechanic immediately. When I went for tire rotation, the service center scanned the vehicle and retrieved two diagnostic codes: P0299 and P0300. I've had both the TCM and PCM replaced in the past, with the ECU replacement occurring recently. Today, after driving briefly, the car ran smoothly without entering limp mode—though the CEL remains on. The codes are: - P0299: The Powertrain Control Module (PCM) detects that the difference between the desired and actual boost pressure readings from the Boost Pressure Sensor exceeds a calibrated threshold under current driving conditions. - P0300: A common multi-cylinder misfire code; often occurs in conjunction with P0299. I'm seeking advice on possible causes and next steps. Any insights or troubleshooting tips would be greatly appreciated, especially given the history of previous powertrain module replacements.
P0299: The PCM detects that the difference between the desired boost pressure and actual sensor reading exceeds a calibrated threshold under current driving conditions. Possible Causes: - Restricted air filter - Boost system pressure hoses restricted or leaking - Small intake system leak or restriction - Exhaust system restriction - Wastegate solenoid malfunction - Wastegate valve sticking - Turbocharger with dragging turbine (e.g., turbo lag or mechanical binding) P0300: A common multi-cylinder misfire code. It is often linked to P0299 and should be addressed first. Possible Causes: - Engine oil level low, aerated, or contaminated - Incorrect engine oil filter - Insufficient oil pressure due to mechanical failure in the oiling system - Engine vacuum leak - Exhaust restriction - Faulty ignition coil or spark plug - Fuel system issues (poor fuel quality or inadequate fuel pressure) - Faulty fuel injector - Crankshaft Position Sensor (CKP) or tone wheel malfunction - Excessive carbon buildup or valvetrain problems - Variable Valve Actuation (VVA) system failure - Coolant leaking into a cylinder - Engine mechanical issues or low compression - Powertrain Control Module (PCM) fault