P127C Diagnostic Trouble Code

P127C 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 P127C diagnostic trouble code may include:

Hesitation upon acceleration
Excessive exhaust leak
Rich or lean exhaust
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Some aftermarket accessories and performance modifications

Repair Processes :

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector.

Process Tips

Diagnostic trouble code P127C 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 P127C.

Fortunately, P127C is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P127C Trouble Code For Specific Cars

P127C Ford Mondeo Mirror Driver Vertical Switch Circuit Short To Battery
P127C Innocenti 950 SCP (J1850) Invalid or Missing Data for Function Read Fuel System
P127C Citroen Osee Fuel Pump Resistor Switch Circuit Malfunction
P127C Mazda Cx-9 Transmission Transfer Case Shift Motor Circuit Failure
P127C Skoda Octavia Iii Knock Sensor 2 Circuit Input Intermittent (Bank 2)
P127C Ghia 1500 Oil Change Reset Button Circuit Failure
P127C Mazda Taiki A/C Evaporator Air Temperature Circuit High