P099A Diagnostic Trouble Code

P099A 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 P099A diagnostic trouble code may include:

Vacuum leak on the engine
Reduction in engine performance, especially at low RPM levels
Engine surge
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.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Look at the plug wires to make sure they are not burnt or laying on the exhaust. If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs.

Process Tips

Diagnostic trouble code P099A 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 P099A.

Fortunately, P099A is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P099A Trouble Code For Specific Cars

P099A Toyota Celsior O2 Sensor Circuit Malfunction (Bank 2 Sensor 1)
P099A Mazda Drifter Transmission Transfer Case System Concern - Servicing Required
P099A Maserati Biturbo Transmission Fluid Pressure Sensor/Switch C Circuit High
P099A Infiniti I30
P099A Fiat Ecobasis Lamp Seat Belt Circuit Failure
P099A Chenard Walcker 10 Door Unlock Disarm Output Circuit Open
P099A Hertz D Passenger's Seat Forward Switch Circuit Short to Battery