What are the most common Mercedes-Benz EQC problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2019 Mercedes-Benz EQC has 6 documented issues. The most frequently reported are: High-voltage battery housing corrosion from inadequate sealing, Electric drive module coolant leak (motor reducer sealing), Electric power steering wiring harness water ingress / short circuit. Of these, 3 are rated critical and should be addressed promptly.
Is the Mercedes-Benz EQC reliable?
The 2019 Mercedes-Benz EQC has 6 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 3 issues are rated critical: High-voltage battery housing corrosion from inadequate sealing and Electric drive module coolant leak (motor reducer sealing) and Electric power steering wiring harness water ingress / short circuit. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Mercedes-Benz EQC problems?
Repair costs for known Mercedes-Benz EQC issues range from $0 to $300, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2019 Mercedes-Benz EQC High-voltage battery housing corrosion from inadequate sealing?
Australian recall REC-001692 directly identifies 2019 EQC400 vehicles whose high-voltage battery housing sealing can degrade, allow moisture entry, cause corrosion and potentially create an electrical short and fire risk. Owners of affected VINs are directed to an authorized deal… Severity: high.
What is the 2019-2021 Mercedes-Benz EQC Electric drive module coolant leak (motor reducer sealing)?
Due to manufacturing deviations in the electric drive module, the internal cooling circuit can have insufficient sealing, causing coolant to leak — owners likened it to an EV 'oil leak.' If coolant enters the motor it can reduce the high-voltage system's insulation resistance ove… Repairs typically run $0-$0. Severity: high.
What is the 2019-2021 Mercedes-Benz EQC Electric power steering wiring harness water ingress / short circuit?
The wiring harness for the electric power steering (steering control unit) can be damaged during the production process, allowing water/moisture into the harness. This can cause a short circuit and a sudden loss of electric power steering assistance, plus an increased fire risk. Repairs typically run $0-$0. Severity: high.
What is the 2019-2023 Mercedes-Benz EQC Inconsistent brake-by-wire pedal feel (regen/friction blending)?
Owners widely report a non-linear, inconsistent brake pedal: 'spongy' or 'mushy' at the top of travel then suddenly 'grabby' lower down, making smooth stops hard. This stems from the EQC's brake-by-wire system blending regenerative and friction braking; the transition is not alwa… Repairs typically run $0-$300. Severity: medium.
What is the 2019-2023 Mercedes-Benz EQC 12V auxiliary battery malfunction / drain?
EQC owners report recurring 'Auxiliary Battery Malfunction' warnings, sometimes appearing repeatedly (every minute or so), along with dimming lights, intermittent infotainment glitches and occasional no-start. The small 12V auxiliary (AGM) battery that powers electronics weakens… Repairs typically run $60-$300. Severity: medium.
What is the 2019-2023 Mercedes-Benz EQC Heavy cold-weather range loss and inefficient heat pump?
EQC owners report large winter range drops — commonly 25-30%+ at around -10C, with real-world examples falling from ~230-239 miles to ~180-190 miles. While some cold-weather loss is normal for any EV, owners and reviewers single out the EQC's heat-pump/PTC heater strategy as rela… Repairs typically run $0-$0. Severity: low.
