C2648 Diagnostic Trouble Code

C2648 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 C2648 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Diminished fuel efficiency

Possible Causes :

Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
An air leak forward of the DPF will change the sensor readings resulting in the code

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 the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for.

Process Tips

Diagnostic trouble code C2648 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 C2648.

Fortunately, C2648 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2648 Trouble Code For Specific Cars

C2648 Mazda Rx8 A Camshaft Position Actuator Circuit (Bank 2)
C2648 Ford Ten Mirror Passenger Vertical Switch Circuit Failure
C2648 Mercedes Sl 500 Air Bag Crash Sensor #2 Feed/Return Circuit Short To Battery
C2648 Mercury V8 Air Suspension RF Air Compress Request Exceeded Max Timing
C2648 Borgward Isabella Control Sleeve Sensor Malfunction
C2648 Buick Blackhawk Cylinder 5 Misfire Detected
C2648 Suzuki Vitara Iv Mirror Driver Up Circuit Short To Ground