U0823 Diagnostic Trouble Code

U0823 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 U0823 diagnostic trouble code may include:

Lack of power
Faulty O2 Sensor
Poor acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

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. 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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

Process Tips

Diagnostic trouble code U0823 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 U0823.

Fortunately, U0823 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0823 Trouble Code For Specific Cars

U0823 Rover Streetwise Ignition Cylinder Sensor Open Circuit
U0823 Sunbeam 3 Manifold Absolute Pressure Barometric Pressure Correlation
U0823 Abarth Renault A/C Post Heater Sensor Circuit Short To Ground
U0823 Chevrolet Equinox 3 Driver's Seat Seatback Autoglide Forward Switch Circuit Short to Ground
U0823 Sunbeam-talbot Mk Iii Master Cylinder Pressure Sensor Circuit Failure
U0823 Oldsmobile Vista Cruiser Damper LR Circuit Open
U0823 Ford Cortina Main Blower Motor Relay Circuit Short to Battery