U3657 Diagnostic Trouble Code

U3657 is a kind of OBD-II Diagnostic U-Network 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 U3657 diagnostic trouble code may include:

Blown fuse (if applicable)
Engine surge
Reduction in engine performance, especially at low RPM levels
Poor fuel economy

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Dirty air cleaner element Damaged DPF

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. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code U3657 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 U3657.

Fortunately, U3657 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U3657 Trouble Code For Specific Cars

U3657 Fiat Idea Lamp Turn Signal Front Output Circuit Open
U3657 Ford Consul MAF Sensor In Range But Higher Than Expected
U3657 Elfin Ms Injection Pump Fuel Metering Control "A" High (Cam/Rotor/Injector)
U3657 Brutsch Zwerg Cruise Control/Brake Switch A Circuit Low
U3657 Gobron 15 Park/Neutral Switch Circuit Failure
U3657 Ford Station Mirror Passenger Up Circuit Short To Battery
U3657 Tvr Se Power Limit Shutdown Fault