P1085 Diagnostic Trouble Code

P1085 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 P1085 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Diminished fuel efficiency

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 :

Now, clear the codes and test-drive the vehicle to see if the code is reset. 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 P1085 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 P1085.

Fortunately, P1085 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1085 Trouble Code For Specific Cars

P1085 Talbot Saoutchik Mirror Passenger Left Circuit Short To Battery
P1085 Nissan X-terra Cylinder #7 High To Low Side Short
P1085 Chrysler Town Exhaust Pressure Control Valve Intermittent
P1085 Renault 10 Gate Select Position Circuit Range/Performance
P1085 Lotus Carlton Torque Converter/Brake Switch B Circuit Malfunction
P1085 Adler 1.7 ABS Inlet Valve Coil RF Circuit Open
P1085 Fpv Bf Multi-faults - Bank 1 - With Low Side Shorts