B2171 Diagnostic Trouble Code

B2171 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 B2171 diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
Poor acceleration

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Faulty IMRC actuator relay (if equipped)

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

Process Tips

Diagnostic trouble code B2171 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 B2171.

Fortunately, B2171 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2171 Trouble Code For Specific Cars

B2171 Oakland 6 Cylinder 2 Injector Circuit Low
B2171 Isuzu Rodeo SCP (J1850) Invalid or Missing Data for Vehicle Id (VIN)
B2171 Armstrong Siddeley Star Sapphire Air Suspension Rear Height Sensor Low Signal Circuit Failure
B2171 Horch 3.5 RF LAMP HIGH BEAM CIRCUIT Short to Battery
B2171 Eagle Vision Incorrect Module Design Level
B2171 Bizzarrini A3c Brake Pressure Switch Mechanical Failure
B2171 Volvo 850