C1615 Diagnostic Trouble Code

C1615 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 C1615 diagnostic trouble code may include:

Faulty or damaged wiring
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
Poor fuel economy
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors. 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. 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 C1615 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 C1615.

Fortunately, C1615 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1615 Trouble Code For Specific Cars

C1615 Citroen Xantia Fuel Rail Pressure Sensor Circuit Low Input
C1615 Nissan Z Concept Cylinder 1 Contribution/Balance Fault
C1615 Renault Clio 5 Gear Shift Position Circuit [senses forward / rearward position, odd / even gears]
C1615 Imperial Newport
C1615 Bizzarrini A3c Brake Pressure Switch Mechanical Failure
C1615 Maserati Auge Transmission Fluid Pressure Sensor/Switch B Circuit Low
C1615 Sta Matilde Sm Lamp Headlamp Input Circuit Short To Ground