P17B9 Diagnostic Trouble Code

P17B9 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 P17B9 diagnostic trouble code may include:

Corroded or damaged connector
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Lack of power
Diminished fuel efficiency

Possible Causes :

Faulty IMRC actuator/sensor
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

Repair Processes :

Now, clear the codes and test-drive the vehicle to see if the code is reset. Look at the plug wires to make sure they are not burnt or laying on the exhaust. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code P17B9 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 P17B9.

Fortunately, P17B9 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P17B9 Trouble Code For Specific Cars

P17B9 Fiat 16 Hp Lack Of HO2S Switch - Sensor Indicates Rich
P17B9 Pontiac Parisienne Fan Relay (Low) Circuit Malfunction
P17B9 Riley Mph HPU (Hydraulic Pump Unit) Pressurisation Failure
P17B9 Berkeley Twosome Brake Fluid Level Sensor Input Short Circuit To Battery
P17B9 Nissan Trailrunner Cylinder #4 High To Low Side Open
P17B9 Mitsubishi Shogun Aux Heater Glow Plug Circuit Open
P17B9 Bmw 2 Camshaft Position Sensor Circuit High Input