U3021 Dodge Dart OBD Code

OBD/2 U3021 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.

In most cases, the TCM is integrated into a single housing with the PCM. Nevertheless, the section of the module which controls (automatic) transmission function may be powered up separately. In any case, the TCM is typically powered using switched (only present with the ignition switch in the ON, start, or run position) voltage. This circuit is normally equipped with a fuse, fusible link, and/or a relay. Frequently, the PCM and TCM are powered using the same relay albeit by separate circuits. Access to a reliable vehicle information source will yield necessary details of the TCM power circuit for the specific vehicle in question.

U3021 Dodge Dart Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine U3021 light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If crankshaft position sensor a circuit range/performance so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the crankshaft position sensor a circuit range/performance.

Common Causes of Dodge Dart U3021 OBD2 Code

A common cause of code U3021 is the failure of Crankshaft Position Sensor A Circuit Range/Performance, but there are several other possible causes as well, such as ;

EVAP canister or fuel tank leaks
Faulty front heated oxygen sensor
Faulty Crankshaft Position Sensor (POS)
Faulty starter motor

U3021 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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U3021 Dodge Dart OBD Code

U3021 Dodge Dart Error Code Repair Process :

Common Causes of Dodge Dart U3021 OBD2 Code

U3021 code for other Dodge cars