C1572 Diagnostic Trouble Code

C1572 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 C1572 diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
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
Faulty IMRC actuator relay (if equipped)

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. Now, clear the codes and test-drive the vehicle to see if the code is reset. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code C1572 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 C1572.

Fortunately, C1572 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1572 Trouble Code For Specific Cars

C1572 Mazda 323 Transmission Transfer Case Contact Plate 'C' Circuit Failure
C1572 Vauxhall Omega Pressure Control Solenoid B Stuck On
C1572 Maudslay 2-l Transmission Range Display Circuit Malfunction
C1572 Mazda Rx-evolv A/C Clutch Circuit Fault
C1572 Fiat Twelve Left Front Sensor Circuit Short to Vbat
C1572 Lincoln Town Car Throttle/pedal Position Sensor/Switch B Circuit Low Input
C1572 Riley 4 Hood Switch Circuit Short To Ground