C16A1 Diagnostic Trouble Code

C16A1 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 C16A1 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 :

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 C16A1 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 C16A1.

Fortunately, C16A1 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C16A1 Trouble Code For Specific Cars

C16A1 Ferrari 255 Input/Turbine Speed Sensor Circuit Malfunction
C16A1 Ford St Mirror Passenger Up Circuit Open
C16A1 Standard Companion Lamp Headlamp Low-Beam Circuit Failure
C16A1 Moretti S Coupe Boost Calibration High
C16A1 Proton Savvy Fuel Tank Pressure Sensor Circuit Open
C16A1 Mitsubishi Dingo Audio Voice Module Not Responding
C16A1 Daihatsu Consorte Gear Shift Module Communication Circuit