P3321 Chevrolet Suburban OBD Code

OBD/2 P3321 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.

As the engine heats up and combustion becomes easier and more complete, the PCM will command the idling control valve to increase the amount of air entering the engine to suit the changing conditions. However, when the load on the engine changes, say, when some electrical consumers or other systems are either turned on or off, the PCM adapts the signal voltage to the idle control valve to ensure that the idling speed remains stable, and at the RPM specified by the manufacturer.

P3321 Chevrolet Suburban Error Code Repair Process :

If your powertrain performance mode switch circuit failure check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system P3321 and engine control unit are in charge of monitoring a bunch of different powertrain performance mode switch circuit failure, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Chevrolet Suburban P3321 OBD2 Code

A common cause of code P3321 is the failure of Powertrain Performance Mode Switch Circuit failure, but there are several other possible causes as well, such as ;

EVAP canister or fuel tank leaks
Exhaust tube
Clogged or faulty fuel injector (s)
Faulty variable valve timing (VVT)

P3321 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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P3321 Chevrolet Suburban OBD Code

P3321 Chevrolet Suburban Error Code Repair Process :

Common Causes of Chevrolet Suburban P3321 OBD2 Code

P3321 code for other Chevrolet cars