C2985 Diagnostic Trouble Code

C2985 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 C2985 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
Poor fuel economy

Possible Causes :

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.
Defective ECU strategies or components will prevent proper regeneration
Faulty IMRC actuator/sensor

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. 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. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code C2985 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 C2985.

Fortunately, C2985 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2985 Trouble Code For Specific Cars

C2985 Reliant Se6 Gate Select Position Circuit High
C2985 Citroen Xanae Fuel Rail Pressure Sensor Circuit Intermittent
C2985 Porsche 911 Type 991 FTS High - Fuel Pump Temperature Sensor High
C2985 Lotus 79 Torque Converter/Brake Switch B Circuit Low
C2985 Volvo 240 SCP (J1850) Invalid or Missing Data for Digital Audio Tape
C2985 Lotec Sirius Torque Converter Clutch Circuit Malfuction
C2985 Mega Monte Carlo A/C Refrigerant Temperature Sensor/Circuit Malfunction