P134A Diagnostic Trouble Code

P134A 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 P134A diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Hesitation upon acceleration

Possible Causes :

Some aftermarket accessories and performance modifications
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.
An air leak forward of the DPF will change the sensor readings resulting in the code

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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

Process Tips

Diagnostic trouble code P134A 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 P134A.

Fortunately, P134A is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P134A Trouble Code For Specific Cars

P134A Nissan C 52 Climate Control Temperature Differential Circuit Open
P134A Infiniti M35 SCP (J1850) Invalid or Missing Data for External Lamp Outage
P134A Buick Special Damper LF Circuit Failure
P134A Holden Je Power Steering Output Circuit Malfunction
P134A Tvr Taimar Power Sliding Door Override Switch Input Ckt Short to Gnd
P134A Jeep Mb Seat Driver Rearward Switch Circuit Short To Ground
P134A Vector M 12 PRNDL Reverse Input Short Circuit To Ground