P81C3 Mercedes 122f 16hp OBD Code

OBD/2 P81C3 error code description and symptoms.

Low Speed Fuel Pump Primary Circuit Malfunction The PCM monitors the low speed fuel pump (LFP) primary circuit output from the PCM.
The test fails if: When the LFP circuit is commanded on (grounded), excessive current draw is detected on the LFP circuit; or when the LFP circuit is commanded off, voltage is not detected on the LFP circuit (the PCM expects to detect VPWR voltage coming through the low speed fuel pump relay coil to the LFP circuit). Open or shorted low fuel pump (LFP) circuit Open VPWR to low speed fuel pump relay Damaged low speed fuel pump relay Damaged PCM An open circuit or short to ground can only be detected with the low speed fuel pump.

One example of this would be when an automatic vehicle in placed in gear. To prevent the added drag from the torque converter and transmission from reducing the idling speed, the PCM will command the idle control valve to allow more air to enter the engine, while at the same time, adjusting the injector pulse width to inject more fuel to suit the increased amount of air. Note that the idle air control valve is closed by the PCM when the throttle plate is opened to prevent excess air from entering the engine.

P81C3 Mercedes 122f 16hp Error Code Repair Process :

The scent may P81C3 signal oil or coolant leaking from their normally closed-loop systems, or it may indicate dangerous exhaust gases invading your car's interior. Car and truck exhaust contains toxic gases such P81C3, so if the inside of your car as if you were standing behind your car, get out and get it fixed. Fight the urge to take a little nap first. So sleepy. That's the carbon monoxide talking, friends. At least open a window on your way to the shop.

Common Causes of Mercedes 122f 16hp P81C3 OBD2 Code

A common cause of code P81C3 is the failure of , but there are several other possible causes as well, such as ;

EVAP canister or fuel tank leaks
Faulty Variable Camshaft Timing (VCT) position solenoid
Incorrect Positive Crankcase Ventilation (PCV) hose connection
Faulty Intake Valve Timing Control Solenoid Valve

P81C3 is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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P81C3 Mercedes 122f 16hp OBD Code

P81C3 Mercedes 122f 16hp Error Code Repair Process :

Common Causes of Mercedes 122f 16hp P81C3 OBD2 Code

P81C3 code for other Mercedes cars