P146D Diagnostic Trouble Code

P146D 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 P146D diagnostic trouble code may include:

Fuel pressure too high
Diminished fuel efficiency
Rich or lean exhaust
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

Possible Causes :

A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Faulty IMRC actuator/sensor
Faulty IMRC actuator relay (if equipped)

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code P146D 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 P146D.

Fortunately, P146D is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P146D Trouble Code For Specific Cars

P146D Jaguar F-pace Seat Driver Forward Switch Circuit Open
P146D Lada Largus Shift Solenoid B Control Circuit Range/Performance
P146D Opel City Decklid Punch-Out Sensor Circuit Failure
P146D Caparo T1 Door Ajar Circuit Short To Ground
P146D Cisitalia 202 Exhaust Valve Control Solenoid Circuit Low (Bank 1)
P146D Audi A5 Antenna Not Connected
P146D Chrysler Laser Evaporative Emission Control System Pressure Sensor Low Input