C0852 Diagnostic Trouble Code

C0852 is a kind of OBD-II Diagnostic C-Chassis 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 C0852 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
Hesitation upon acceleration

Possible Causes :

Some aftermarket accessories and performance modifications
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Faulty IMRC actuator/sensor

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. If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs.

Process Tips

Diagnostic trouble code C0852 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 C0852.

Fortunately, C0852 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0852 Trouble Code For Specific Cars

C0852 Mercedes Gla Accelerometer Rear Circuit Short To Battery
C0852 Ajax Ajax ABS Outlet Valve Coil LR Circuit Short To Ground
C0852 Suzuki Forenza Metering Oil Pump Stepping Motor Circuit Malfunction
C0852 Tornado Thunderbolt Motor Relay # 1 Circuit Failure
C0852 American Speedster Air Suspension Height Sensor Power Circuit Short To Ground
C0852 Peugeot Touareg Engine Oil Pressure Sensor/Switch Range/Performance
C0852 Honda Cr-z Pressure Switch A Circuit Malfunction