The issue was traced to possible leakage in the coolant pump that could heat up components, Daimler said on Tuesday.
The news was first reported by Germany’s mass-selling Bild newspaper, which published a copy of a letter Daimler sent to some 800,000 Mercedes-Benz owners affected by the defect that said “the risk of a fire could not be ruled out.”
Daimler confirmed the letter was authentic.
It added in the letter that the parts needed to fix the problem were not immediately available so a recall was not possible at the moment, but would be launched as soon as the components became available.
“In the meantime the affected vehicle should be driven in a particularly prudent manner and usage reduced to the bare minimum,” the letter said.
Daimler could not confirm Bild’s report that 800,000 vehicles were affected.
“The owner of a vehicle affected by a recall should always contact the nearest Mercedes-Benz service partner immediately,” the company said in a statement.
The affected models are certain GLE/GLS (167 platform), C-Class (205 platform), E-Class (213 platform), S-Class (222 platform), S-Class (223 platform), E-Class Coupe/Convertible (238 platform), GLC (253 platform), CLS (257 platform) and G-Class (463 platform), Daimler said.