P0905 Diagnostic Trouble Code

P0905 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 P0905 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
Engine surge

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.
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

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. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

Process Tips

Diagnostic trouble code P0905 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 P0905.

Fortunately, P0905 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0905 Trouble Code For Specific Cars

P0905 Rover Montego Ignition Coil Primary Circuit Failure
P0905 Tvr T350 Power Sliding Door On/Off Switch Open Circuit
P0905 Subaru R1 LF SIDE REPEATER LAMP OUTPUT Ckt Short to Battery
P0905 Volkswagen Touran Ii
P0905 Toyota Estima O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
P0905 Humber 6 Right Rear Center Sensor Circuit Failure
P0905 Bentley Continental Battery Power Supply ECU Circuit Short To Battery