P1255 Diagnostic Trouble Code

P1255 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 P1255 diagnostic trouble code may include:

The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Faulty or damaged wiring
Hesitation upon acceleration
Reduction in engine performance, especially at low RPM levels

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
Defective ECU strategies or components will prevent proper regeneration

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.

Process Tips

Diagnostic trouble code P1255 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 P1255.

Fortunately, P1255 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1255 Trouble Code For Specific Cars

P1255 Toyota Land Cruiser Oil Pressure Switch Failure
P1255 Nissan Serena Cruise Control Deactivator Brake Switch Circuit Failure
P1255 Tornado Tempest Motor # 2 Input Circuit Short to Vbat
P1255 Austin 18 Audio Steering Wheel Switch Circuit Fault
P1255 Ferrari 735 Intake Valve Control Solenoid Circuit Low (Bank 2)
P1255 Peugeot Asphalte Electronic Throttle Monitor Cruise Disable
P1255 Bugatti Type 43 Cylinder 11 Contribution/balance Fault