P1B9C Diagnostic Trouble Code

P1B9C 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 P1B9C diagnostic trouble code may include:

Blown fuse (if applicable)
Engine surge
Reduction in engine performance, especially at low RPM levels
Poor fuel economy

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.
Dirty air cleaner element Damaged DPF

Repair Processes :

Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code P1B9C 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 P1B9C.

Fortunately, P1B9C is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1B9C Trouble Code For Specific Cars

P1B9C Davrian Imp HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
P1B9C Datsun 100 Heated Windshield Relay Coil Circuit Failure
P1B9C Dodge Caravan Ignition Coil C Primary/Secondary Circuit Malfunction
P1B9C Mg 18 Air Suspension RR Air Spring/Shock Solenoid Output Circuit Failure
P1B9C Railton 20 Fuel Temperature Sensor A Circuit Intermittent
P1B9C Lagonda 16 Shift Solenoid D Control Circuit Low
P1B9C Lada 112 Servo Motor Potentiometer Vent Circuit Short To Battery