B1890 Diagnostic Trouble Code

B1890 is a kind of OBD-II Diagnostic B-Body 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 B1890 diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
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
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code B1890 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 B1890.

Fortunately, B1890 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1890 Trouble Code For Specific Cars

B1890 Chrysler Imperial Evaporative Emission Control System Malfunction
B1890 Ford Lynx Mirror Driver Up Circuit Short To Ground
B1890 Renault Re Heated Windshield Relay Coil Circuit Failure
B1890 Kia Sorento Ii Secondary Air Injection System Switching Valve B Circuit Shorted
B1890 Bmw C 650 Gt Climate Control Pushbutton Circuit Failure
B1890 Honda Fcx PRNDL Input #4 Circuit Failure
B1890 Pontiac Catalina Exhaust Pressure Sensor High