P20DB Diagnostic Trouble Code

P20DB 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 P20DB diagnostic trouble code may include:

Blown fuse (if applicable)
Engine surge
Reduction in engine performance, especially at low RPM levels
Malfunction Indicator Lamp (MIL) illuminated

Possible Causes :

A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Some aftermarket accessories and performance modifications
Dirty air cleaner element Damaged DPF

Repair Processes :

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code P20DB 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 P20DB.

Fortunately, P20DB is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P20DB Trouble Code For Specific Cars

P20DB Piontek Sport-tech Evaporative Emission (EVAP) System Flow During Non-Purge Oldsmobile Only
P20DB Farbio Gts Injector Circuit Open / Shorted - Cylinder #2
P20DB Toyota Quantum Park Brake Switch # 2 Applied Circuit Failure
P20DB Studebaker President Lamp Warning Relay Circuit Failure
P20DB Scripps-booth 22 Hp Injector Circuit Malfunction - Cylinder 1
P20DB Pininfarina Coupe Engine Speed Input Circuit Range/Performance
P20DB Fairthorpe Rockette Injector Circuit Malfunction - Cylinder 6