P149E Diagnostic Trouble Code

P149E 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 P149E 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
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
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. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications.

Process Tips

Diagnostic trouble code P149E 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 P149E.

Fortunately, P149E is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P149E Trouble Code For Specific Cars

P149E Tvr Type S Power Steering Pressure Sensor Circuit Malfunction
P149E Innocenti 990 SCP (J1850) Invalid or Missing Data for Function Read Vehicle Speed
P149E Riley Brooklands Horn Relay Coil Circuit Failure
P149E Maserati Kyalami Transmission Fluid Pressure Sensor/Switch E Circuit Range/Performance
P149E Holden Monaro Power Supply #2 Circuit Short to Ground
P149E Isuzu N-serie SCP (J1850) Invalid or Missing Data for Vehicle Configuration
P149E Suzuki Sx4 S-cross Mirror Driver Switch Assembly Circuit Short To Ground