C0545 Diagnostic Trouble Code

C0545 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 C0545 diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
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
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

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. 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.

Process Tips

Diagnostic trouble code C0545 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 C0545.

Fortunately, C0545 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0545 Trouble Code For Specific Cars

C0545 Mg Zt-t ANTI THEFT HORN OUTPUT CIRCUIT Failure
C0545 Volkswagen Karmann Ghia Right Lamp Outage Signal Circuit Short to Ground
C0545 Ford Triton Misfire Rate Catalyst Damage Fault - Bank 1
C0545 Saab 93 Ignition Start Circuit Open
C0545 Lotus 72 Torque Converter/Brake Switch B Circuit High
C0545 Ohta Pk Cylinder 4 Contribution/Balance Fault
C0545 Mg Tb Alarm Panic Input Circuit Short To Ground