C1635 Diagnostic Trouble Code

C1635 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 C1635 diagnostic trouble code may include:

Lack of power
Faulty O2 Sensor
Poor acceleration
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

Repair Processes :

It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. 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.

Process Tips

Diagnostic trouble code C1635 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 C1635.

Fortunately, C1635 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1635 Trouble Code For Specific Cars

C1635 Ford Explorer Memory 2 Switch Circuit Failure
C1635 Cisitalia D.2 External Charging Fault
C1635 Abarth 210 4-5 Shift Malfunction
C1635 Standard Ensign Lamp Headlamp Low-Beam Circuit Short To Battery
C1635 Honda Hr-v PSD Not Fully Closed (Module Commanded Successfully)
C1635 Lea-francis Ace TCC PWM Solenoid Circuit Electrical/ Transmission Transfer Case Contact Plate 'D' Short Circuit To Battery
C1635 Rover 400 Ignition Coil A Secondary Circuit Malfunction