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Mercedes-Benz recalls CLA, GLA, S63 to fix two separate engine issues

Camshaft welds are prone to failure in some engines, while the S63 requires a software update to prevent stalling.

Mercedes-Benz has launched two separate recall campaigns, one to resolve defective camshaft welds and another to prevent stalling.

The bad welds are associated with the turbocharged, direct-injected 2.0-liter four-cylinder engine used in the 2015 CLA250, GLA250 and SLK300. A problem with a laser machine allowed some welds to shift out of proper alignment.

The bad welds can potentially fail and damage the engine, increasing the risk of a crash due to stall while underway.

The second recall focuses on the 2014 S63 AMG and the 2015-2016 S63 AMG 4Matic, including both coupes and sedans. A software error within the engine control unit can cause the engine to stall when coasting to a stop.

"The vehicle stall may be interpreted by the driver to be a planned shut-down as part of the ECO-Start-function," the company warns. "However, the engine will not restart automatically after releasing the brake pedal, immobilizing the vehicle and increasing the risk of a crash."

The campaigns list a total of less than 3,000 units. Mercedes-Benz plans to begin fixing cars by late November or early December.

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