U2660 Diagnostic Trouble Code

U2660 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 U2660 diagnostic trouble code may include:

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
Faulty or damaged wiring
Hesitation upon acceleration
Engine surge

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.
Defective ECU strategies or components will prevent proper regeneration

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. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

Process Tips

Diagnostic trouble code U2660 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 U2660.

Fortunately, U2660 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U2660 Trouble Code For Specific Cars

U2660 Plymouth Superbird Exhaust Gas Recirculation Circuit Malfunction
U2660 Toyota Highlander Oil Level Lamp Circuit Failure
U2660 Fiat 1300 Knock Sensor 2 Circuit Input Intermittent (Bank 2)
U2660 Mercedes E 420 Accelerator Position Sensor Out of Range
U2660 Datsun 2000 High Load Neutral/Drive Fault
U2660 Proton Waja Fuel Temperature Sensor #1 Circuit Failure
U2660 Ferrari C62 Interior Fan Control Circuit Open