C1012 Diagnostic Trouble Code

C1012 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 C1012 diagnostic trouble code may include:

Corroded or damaged connector
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Lack of power
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
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 :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code C1012 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 C1012.

Fortunately, C1012 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1012 Trouble Code For Specific Cars

C1012 Toyota Aurion NVM Configuration Failure
C1012 Toyota Caldina O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
C1012 Peugeot Expert Enable Signal Circuit Short to Battery
C1012 Rochet-schneider 18 Hydraulic Pressure Sensor Circuit High Input
C1012 Morris Twelve Cam Sensor Fault
C1012 Simca 8 Intake Valve Control Solenoid Circuit Range/Performance (Bank 2)
C1012 Citroen Ds4 Fuel Level Sensor B Circuit Malfunction