C3690 Diagnostic Trouble Code

C3690 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 C3690 diagnostic trouble code may include:

Cherry red hot catalytic converter
Poor acceleration
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. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

Process Tips

Diagnostic trouble code C3690 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 C3690.

Fortunately, C3690 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C3690 Trouble Code For Specific Cars

C3690 Renault Clio 2 Gear Shift Module Communication Circuit
C3690 Lti Fx Traction Control System Malfunction
C3690 Marcos Gts Transfer Case unable to transition between 2H and 4H
C3690 Mitsubishi Endeavor Autolamp Delay Decrease Circuit Open
C3690 Panhard Pl Driver Power Window Up Circuit Open
C3690 Mercedes B 200 ABS Hydraulic Pump Motor Circuit Failure
C3690 Chevrolet Monte Carlo EGI Temperature Sensor Failure