P233B Diagnostic Trouble Code

P233B 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 P233B diagnostic trouble code may include:

Poor fuel economy
Possible spark knock (detonation / pre-ignition)
Misfire
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

Possible Causes :

A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Faulty IMRC actuator/sensor
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.

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. 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 P233B 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 P233B.

Fortunately, P233B is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P233B Trouble Code For Specific Cars

P233B Peugeot 508 Ii ELC System 2 Fault
P233B Maserati 8cl Transmission Fluid Pressure Sensor/Switch B Circuit High
P233B Chevrolet Deville Driver's / Passenger's Door Ajar Output Circuit Short to Battery
P233B Oldsmobile Starfire Damper Low Side Front Circuit Failure
P233B Ghia 1500 Oil Change Reset Button Circuit Failure
P233B Allard M Air Bag Driver Circuit Short To Battery
P233B Mercury Mariner I Air Suspension LR Vent Request Exceeded Max Timing