Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2014 Mercedes-Benz B-Class Electric Drive?

• Diagnostic fees vary; a basic scan at our dealership typically covers full system checks with factory tools to pinpoint high-voltage and control-module codes quickly.
• We often cost less than independent shops because our factory-trained technicians use precise diagnostics that reduce repeat visits and unnecessary part replacements—delivering immediate and long-term savings.
• Any repairs covered under warranty must be performed at a certified dealership to preserve coverage and ensure genuine parts and correct procedures.
• Ask about current service specials and inspection bundles to lower up-front diagnostic expense: /promotions/service/mercedes-benz.htm.

What does it mean when the check engine light comes on in a 2014 Mercedes-Benz B-Class Electric Drive?

• On an electric B‑Class, the light can indicate issues ranging from 12V system faults and CAN communication errors to high-voltage battery, inverter, or thermal-management warnings.
• It signals a stored fault code that requires proper scanning with factory-grade equipment to determine severity and repair path.
• Ignoring the light can reduce range, disable regenerative braking, or lead to safety shutdowns; timely dealer diagnosis prevents escalation and extra costs.
• Repairs under warranty must be completed at a certified dealership to keep coverage intact and ensure lasting value.

What is the first thing to check when the check engine light comes on?

• Start with a diagnostic scan using an approved OBD-II/factory tool to capture stored fault codes—it’s the only reliable first step for EV systems.
• Check the 12V battery and charging port for visible issues; a weak 12V can trigger control-module warnings even if the high-voltage system is fine.
• If you see performance changes or repeated warnings, stop driving and contact our service team—continuing to drive may cause greater damage and higher costs.
• Schedule a certified inspection to preserve warranty coverage and take advantage of dealership expertise: /service/schedule-appointment-pmf.htm.

What is the most common reason for check engine light on a 2014 Mercedes-Benz B-Class Electric Drive?

• Common triggers include 12V system faults, communication errors between control modules, thermal-management issues, and charging or inverter faults.
• Because EV systems are integrated, a failing sensor or low-voltage issue often cascades to other modules, making accurate dealer diagnostics essential.
• Fixing the root cause at a certified dealership delivers better long-term reliability and often lower total ownership cost than piecemeal repairs elsewhere.
• Remember: warranty-covered repairs must be done at a certified dealer to maintain protection and ensure genuine parts are used.

How long does a check engine light service take?

• Basic diagnostics and code reading typically take 30–60 minutes; more complex inspections or replication of intermittent faults can extend the visit.
• If parts or in-depth testing is required, total repair time depends on part availability—our dealership’s access to factory parts and technicians often shortens turnaround compared with independents.
• Choosing dealership service offers immediate savings through accurate fixes and long-term savings via warranty protection and reduced risk of repeat failures.
• Use our online scheduler to book a convenient appointment and get an estimated time based on the specific symptom: /service/schedule-appointment-pmf.htm.