C1633 Diagnostic Trouble Code

C1633 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 C1633 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
Engine surge

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
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. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code C1633 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 C1633.

Fortunately, C1633 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1633 Trouble Code For Specific Cars

C1633 Rolls-royce Silver Cloud IAC Monitor Disabled by PSP Switch Failed On
C1633 Toyota Sports Passenger Door Ajar Circuit Failure
C1633 Cadillac Osceola Dim Panel Decrease Input Circuit Short To Ground
C1633 Lancia 2000 Speed Wheel Rear Input Signal Missing
C1633 Rover Range Rover Ignition Cylinder Sensor Ground Short
C1633 Marcos Mantula Transmission 4-Wheel Drive High Indicator Circuit Failure
C1633 Proton 300 Fuel Restriction Indicator Circuit Malfunction