P1A1B Diagnostic Trouble Code

P1A1B 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 P1A1B diagnostic trouble code may include:

Diminished fuel efficiency
Fuel pressure too high
Malfunction Indicator Lamp (MIL) illuminated
Misfire

Possible Causes :

Faulty IMRC actuator/sensor
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code P1A1B 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 P1A1B.

Fortunately, P1A1B is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1A1B Trouble Code For Specific Cars

P1A1B Morris 1100 Brake Pedal Input Circuit Battery Short
P1A1B Honda Hp-x PRNDL Switch Circuit Failure
P1A1B Plymouth Sundance Exhaust Gas Recirculation (EGR) Position Sensor Performance
P1A1B Rover 45
P1A1B Lea-francis Ace TCC PWM Solenoid Circuit Electrical/ Transmission Transfer Case Contact Plate 'D' Short Circuit To Battery
P1A1B Citroen 10 Hp Fan Control Circuit Malfunction
P1A1B Skoda Superb Iii Lack Of HO2S21 Switch - Sensor Indicates Rich