C3840 Alfa Romeo Crosswagon OBD Code

OBD/2 C3840 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.

A good starting point in your diagnosis is checking all system fuses and fusible links. This can be done using the DVOM on the voltage setting. You will want to test the fuses with circuits loaded. Some fuses will appear normal until a load is placed on their respective circuit; at which point they will fail. This has been the cause of many 'phantom malfunctions'. Consult your vehicle information source for fuse and fusible link locations. If all fuses are in working order, you may want to check TCM relay operation by swapping identical relays. Usually the horn relay, starter relay, fuel pump relay, air conditioning clutch relay, and controller relays are similar enough in design to swap for diagnostic purposes.

C3840 Alfa Romeo Crosswagon Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine C3840 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 vehicle accelerometer power circuit short to battery 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 vehicle accelerometer power circuit short to battery.

Common Causes of Alfa Romeo Crosswagon C3840 OBD2 Code

A common cause of code C3840 is the failure of Vehicle Accelerometer Power Circuit Short to Battery, but there are several other possible causes as well, such as ;

Camshaft Position Sensor harness is open or shorted
Faulty spark plug (s)
Engine Control Module (ECM)
Intake Valve Timing Control Solenoid Valve harness is open or shorted

C3840 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

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

About Us | Contact | Privacy

C3840 Alfa Romeo Crosswagon OBD Code

C3840 Alfa Romeo Crosswagon Error Code Repair Process :

Common Causes of Alfa Romeo Crosswagon C3840 OBD2 Code

C3840 code for other Alfa cars