U04A4 Alfa Romeo 66 OBD Code

OBD/2 U04A4 error code description and symptoms.

Vehicle Speed Sensor (VSS) Intermittent Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. Vehicle speed data is received from either the vehicle speed sensor (VSS), transfer case speed sensor (TCSS), anti-lock brake system (ABS) control module, generic electronic module (GEM), or central timer module (CTM). This DTC is set the same way as U04A4. However, it is intended to flash the transmission control indicator lamp (TCIL) for first time VSS circuit error/malfunctions. Refer to possible causes for U04A4

To check for an open circuit, trace along the length of the transmission control circuit, checking for breaks in the wiring. Repair any broken wiring and make sure all connectors are fully seated and locked.Pay close attention to connectors, looking for corrosion, bent or broken pins, or moisture in the connector. Repair any connector issues even if they are not specifically part of the transmission control circuit as they may serve a function in providing power to the transmission control circuit.

U04A4 Alfa Romeo 66 Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine U04A4 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 engine oil pressure sensor/switch circuit malfunction 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 engine oil pressure sensor/switch circuit malfunction.

Common Causes of Alfa Romeo 66 U04A4 OBD2 Code

A common cause of code U04A4 is the failure of Engine Oil Pressure Sensor/Switch Circuit Malfunction, but there are several other possible causes as well, such as ;

EVAP system hose leaking
Damaged camshaft position (CMP) sensor
Clogged or faulty fuel injector (s)
Ignition coils harness is open or shorted

U04A4 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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U04A4 Alfa Romeo 66 OBD Code

U04A4 Alfa Romeo 66 Error Code Repair Process :

Common Causes of Alfa Romeo 66 U04A4 OBD2 Code

U04A4 code for other Alfa cars