U229A Mercedes-benz W196 OBD Code

OBD/2 U229A 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.

U229A Mercedes-benz W196 Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine U229A 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 speed wheel sensor rf input short circuit 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 speed wheel sensor rf input short circuit to battery.

Common Causes of Mercedes-benz W196 U229A OBD2 Code

A common cause of code U229A is the failure of Speed Wheel Sensor RF Input Short Circuit To Battery, but there are several other possible causes as well, such as ;

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

U229A 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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U229A Mercedes-benz W196 OBD Code

U229A Mercedes-benz W196 Error Code Repair Process :

Common Causes of Mercedes-benz W196 U229A OBD2 Code

U229A code for other Mercedes-benz cars