Mercedes-Benz CLA 250 (2020) – Electric Power Steering Failure After Impact
A Mercedes-Benz CLA 250 developed a power steering malfunction after a severe road impact. Advanced diagnostics identified an internal failure in the Electric Power Steering (EPS) control unit integrated with the steering rack assembly.
About This Case
Customer Complaint The customer reported that immediately after a severe impact with a road bump, the power steering system stopped functioning. Steering effort became significantly heavier, and warning messages related to the steering system appeared on the instrument cluster. Diagnostic Process Upon receiving the vehicle, a complete diagnostic inspection was carried out using advanced Mercedes-Benz diagnostic equipment. The steering system, suspension components, and electronic control systems were inspected to determine whether the fault was caused by mechanical damage or an electronic failure resulting from the impact. Diagnostic fault analysis and system testing revealed that the Electric Power Steering (EPS) control unit was no longer operating correctly. Further verification confirmed an internal failure within the EPS assembly. Because the EPS control module is integrated into the steering rack assembly on this vehicle, the control unit cannot be serviced separately and requires replacement of the complete EPS assembly. Findings Power steering assistance inactive. EPS control unit fault detected. Internal failure confirmed within the EPS assembly. Failure likely triggered by the severe impact event. Steering rack and EPS module are integrated as a single unit. Recommended Repair Replace the complete Electric Power Steering (EPS) assembly. Program and calibrate the replacement unit according to Mercedes-Benz specifications. Perform steering angle sensor calibration. Conduct post-repair system validation and road testing. Expected Result After replacement and programming of the EPS assembly, steering assistance will be fully restored, fault codes will be cleared, and the vehicle will return to normal driving operation. Services Performed ✔ Advanced Mercedes-Benz Diagnostics ✔ Electric Power Steering Diagnostics ✔ EPS Control Unit Testing ✔ Steering System Inspection ✔ Fault Code Analysis ✔ Repair Planning & Verification
Case Details
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