P1557 Diagnostic Trouble Code

P1557 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 P1557 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Reduction in engine performance, especially at low RPM levels

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. 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 P1557 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 P1557.

Fortunately, P1557 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1557 Trouble Code For Specific Cars

P1557 Opel Kapitan Disable Signal Open Circuit
P1557 Gaz 28 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
P1557 Lanchester 30 Speed Control Unable to Hold Speed
P1557 Monteverdi Military Battery Power Supply ECU Circuit Open
P1557 Plymouth Special Excessive Injection Control Pressure
P1557 Turner 1220 Pedal Position Sensor A Circuit Intermittent
P1557 Vauxhall Meriva Pressure Control Solenoid B Control Circuit High