P0604 Diagnostic Trouble Code

P0604 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a P0604 diagnostic trouble code may include:

Faulty O2 Sensor
Lack of power
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors.

Process Tips

Diagnostic trouble code P0604 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P0604.

Fortunately, P0604 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0604 Trouble Code For Specific Cars

P0604 Perodua Myvi Dual Alternator Battery Lamp Circuit Malfunction
P0604 Hyundai Xg
P0604 Lexus Daytona TCM Power Input Signal High
P0604 Moretti Panoramica Boost Calibration Fault
P0604 Smart City Lamp ABS Warning Output Circuit Short To Battery
P0604 Mazda Rx-3 A Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)
P0604 Rolls-royce Silver Cloud IAC Monitor Disabled by PSP Switch Failed On