C2809 Diagnostic Trouble Code

C2809 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 C2809 diagnostic trouble code may include:

Reduction in engine performance, especially at low RPM levels
Vacuum leak on the engine
Diminished fuel efficiency
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
Dirty air cleaner element Damaged DPF

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. Look at the plug wires to make sure they are not burnt or laying on the exhaust. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code C2809 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 C2809.

Fortunately, C2809 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2809 Trouble Code For Specific Cars

C2809 Lombard Al-3 Timing Reference High Resolution Signal B No Pulses
C2809 Rover 220 IDM Input Circuit Malfunction/ Ignition Coil Control Circuit High Voltage
C2809 Abarth 1600
C2809 Willys-overland 685 SCP (J1850) Invalid or Missing Data for Powertrain Status Request
C2809 Dodge M Ignition Key-In Circuit Open
C2809 Peel P50 Driver's Door Unlock Relay Circuit Failure
C2809 Mercury Park Lane Air Suspension Rear Inflator Solenoid Output Circuit Short To Ground