U3649 Alfa Romeo 4c OBD Code

OBD/2 U3649 error code description and symptoms.

Output Shaft Speed sensor circuit intermittent failure The output shaft speed sensor signal to the PCM is irregular or interrupted.
Harness connector not properly seated Harness intermittently shorted, or open Harness connector damaged OSS sensor damaged, or not installed properly Verify harness and connector integrity Verify OSS sensor proper installation.

Circuit High Input codes like U3649 are mostly caused by defective alternators that develop excessive voltages, although there may be other causes as well, such as short circuits that 'leak' current into a particular system from other, unrelated systems that work on higher voltages. Note that in the case of short circuits that leak power into a control circuit, there is likely to be other, seemingly unrelated trouble codes present along with the code(s) being investigated. Diagnosing a 'high input' code will always involve a thorough testing of the charging system as a first step, followed by measures to isolate the system from all other possible sources of power during resistance, continuity, and reference voltage tests.

U3649 Alfa Romeo 4c Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine U3649 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 variable intake solenoid #2 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 variable intake solenoid #2 circuit malfunction.

Common Causes of Alfa Romeo 4c U3649 OBD2 Code

A common cause of code U3649 is the failure of Variable Intake Solenoid #2 Circuit Malfunction, but there are several other possible causes as well, such as ;

Camshaft Position Sensor harness is open or shorted
Faulty Crankshaft Position Sensor (POS)
Dirty Oil
Faulty TCM or TCM programming

U3649 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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U3649 Alfa Romeo 4c OBD Code

U3649 Alfa Romeo 4c Error Code Repair Process :

Common Causes of Alfa Romeo 4c U3649 OBD2 Code

U3649 code for other Alfa cars