U042B Oldsmobile Starfire OBD Code

OBD/2 U042B 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.

U042B Oldsmobile Starfire Error Code Repair Process :

For glow plug/heater circuit a malfunction check engine light is perhaps the most troubling of lights because it could mean so many different things, from you didn't screw the gas cap on tightly enough to look out for pistons flying through the hood and into the stratosphere. The easiest way to find out what this light is telling you is to hook your vehicle up to a scan tool. U042B error code diagnostic tool looks a little like an oversized calculator and plugs into a communication port inside the car. After you instruct it to perform the scan, it speaks glow plug/heater circuit a malfunction with your car's computers to find out exactly what's prompting the light to turn on.

Common Causes of Oldsmobile Starfire U042B OBD2 Code

A common cause of code U042B is the failure of Glow Plug/Heater Circuit A Malfunction, but there are several other possible causes as well, such as ;

EVAP canister or fuel tank leaks
Faulty Camshaft Position Sensor
Faulty ignition coil (s)
Open VPWR circuit

U042B is a kind of Network Trouble Code

U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason.

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

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U042B Oldsmobile Starfire OBD Code

U042B Oldsmobile Starfire Error Code Repair Process :

Common Causes of Oldsmobile Starfire U042B OBD2 Code

U042B code for other Oldsmobile cars