C1046 Diagnostic Trouble Code

C1046 is a kind of OBD-II Diagnostic C-Chassis 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 C1046 diagnostic trouble code may include:

Reduction in engine performance, especially at low RPM levels
Vacuum leak on the engine
Diminished fuel efficiency
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
Dirty air cleaner element Damaged DPF

Repair Processes :

If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code C1046 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 C1046.

Fortunately, C1046 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1046 Trouble Code For Specific Cars

C1046 Citroen Gsa Fuel Pressure Regulator 1 Control Circuit
C1046 Peugeot Nautilus Engine Coolant Sensor intermittent/ECT Sensor Intermittent
C1046 Bugatti Type 15 Cylinder #7 High To Low Side Short
C1046 Nsu Autonova Cylinder 11 Injector Circuit High
C1046 Lexus Rx450h TFT Sensor Out Of Self Test Range
C1046 Vauxhall Zafira A Pressure Transducer Redundant / Secondary Signal Faulted
C1046 Alpine A610 Air Bag Passenger Circuit Short To Battery