B1772 Diagnostic Trouble Code

B1772 is a kind of OBD-II Diagnostic B-Body 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 B1772 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
Reduction in engine performance, especially at low RPM levels

Possible Causes :

A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Some aftermarket accessories and performance modifications
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

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. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code B1772 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 B1772.

Fortunately, B1772 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1772 Trouble Code For Specific Cars

B1772 Peugeot 206
B1772 Cadillac 20f30 Damper LR Circuit Open
B1772 Triumph Stag Pedal Correlation PDS1 and HPDS
B1772 Lon Boll Double Berline Timing Reference High Resolution Signal B Too Many Pulses
B1772 Dodge Demon Ignition Coil L Primary/Secondary Circuit Malfunction
B1772 Rolls-royce Silver Ghost IAT - B Sensor Intermittent
B1772 Pontiac Grand Prix Exhaust Valve Control Solenoid Circuit Range/Performance (Bank 1)