C3709 Diagnostic Trouble Code

C3709 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 C3709 diagnostic trouble code may include:

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

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

Process Tips

Diagnostic trouble code C3709 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 C3709.

Fortunately, C3709 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C3709 Trouble Code For Specific Cars

C3709 Holden Caprice Pedal Position Rearward Switch Circuit Short to Battery
C3709 Honda Stream Reverse Inhibit Control Circuit Malfunction
C3709 Ferrari F2005 Intermediate Shaft Speed Sensor Circuit Intermittent
C3709 Kia Magentis Seatbelt Driver Pretensioner Circuit Failure
C3709 Mg Rv15 Air Temperature Internal Sensor Circuit Short To Ground
C3709 Peugeot Expert Iii Engine Coolant Level Lamp Circuit Short to Ground
C3709 Ferrari 599 Intake Valve Control Solenoid Circuit (Bank 2)