U0085 Diagnostic Trouble Code

U0085 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 U0085 diagnostic trouble code may include:

Malfunction Indicator Lamp (MIL) illuminated
Carbon Buildup on O2 Sensor
Poor fuel economy
Reduction in engine performance, especially at low RPM levels

Possible Causes :

Dirty air cleaner element Damaged DPF
A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

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 damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code U0085 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 U0085.

Fortunately, U0085 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0085 Trouble Code For Specific Cars

U0085 Mitsubishi Rpm Aux Heater Flame Sensor Circuit Open
U0085 Talbot 25 Mirror Passenger Horizontal Feedback Potentiometer Circuit Failure
U0085 Bristol Blenheim Crankshaft Position Sensor A Circuit Malfunction
U0085 Andre V6 Air Suspension LF Height Sensor Circuit Failure
U0085 Marcos 3-litre Transfer Case Contact Plate "C" Encoder Circuit Failure
U0085 Bmw 3200 Cellular Phone Handset Not Present
U0085 Innocenti Im3