P1909 Diagnostic Trouble Code

P1909 is a kind of OBD-II Diagnostic P-Powertrain 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 P1909 diagnostic trouble code may include:

Vacuum leak on the engine
Reduction in engine performance, especially at low RPM levels
Engine surge
Hesitation upon acceleration

Possible Causes :

A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Dirty air cleaner element Damaged DPF
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Look at the plug wires to make sure they are not burnt or laying on the exhaust. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code P1909 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 P1909.

Fortunately, P1909 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1909 Trouble Code For Specific Cars

P1909 Bmw-isetta 611 Communication Link to Display and Switch Module Error
P1909 Falcon 515 Injector Circuit Malfunction - Cylinder 9
P1909 Infiniti Ex35 SCP (J1850) Invalid or Missing Data for Experimental #2
P1909 Nissan Sut Current Sense Circuit Failure
P1909 Mercedes Sl 65 Air Bag Crash Sensor #2 Ground Circuit Short To Battery
P1909 Kia Carens Seat Rear Vertical Motor Position Out of Range
P1909 Bmw 7 Climate Control A/C Pressure Switch Circuit Failure