C1139 Diagnostic Trouble Code

C1139 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 C1139 diagnostic trouble code may include:

Malfunction Indicator Lamp (MIL) illuminated
Carbon Buildup on O2 Sensor
Poor fuel economy
Rich or lean exhaust

Possible Causes :

The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Fuel with a large percentage of sulfur will clog the DPF quickly
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

Process Tips

Diagnostic trouble code C1139 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 C1139.

Fortunately, C1139 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1139 Trouble Code For Specific Cars

C1139 Mercedes-benz F Class Air Suspension Disable Switch Circuit Open
C1139 Cadillac 314 Damper LR Circuit Short To Battery
C1139 Toyota Hi-ace Oil Change Reset Button Circuit Short To Ground
C1139 Kia Koup Seat Track Position Switch Circuit Short to Ground
C1139 Izh Oda Seat Direction Switch Assembly Circuit Short To Ground
C1139 Volkswagen Gx3 Ride Control RR Shock Actuator Circuit Short To Ground
C1139 Chevrolet Camaro 6 Driver Power Window Motor Circuit Short To Battery