The ‘Remote Engine Start Not Available’ message in Mercedes-Benz vehicles indicates that the remote start function cannot be activated due to system limitations, unsuitable conditions, or a fault. The Remote Engine Start (RES) feature allows drivers to start the engine remotely using the key fob or the Mercedes me app, providing convenience for pre-conditioning the cabin. When the system is unavailable, the cluster or app may display ‘Remote Engine Start Not Available.’ This article explains how the system works, common reasons for this warning, diagnostic steps, and solutions.
What is Remote Engine Start?
Remote Engine Start (RES) allows the vehicle to be started from a distance to pre-heat or pre-cool the cabin before entry. It integrates with the vehicle’s security, climate control, and ignition systems. RES is often controlled through the Mercedes key fob or the Mercedes me smartphone app. For safety reasons, the system includes numerous checks before activation.
Why Does ‘Remote Engine Start Not Available’ Appear?
The system may deactivate or become unavailable due to:
1. Vehicle not locked or doors/hood/trunk left open.
2. Low fuel level preventing safe operation.
3. Low battery voltage (main or auxiliary battery).
4. Active warning lights or system malfunctions (e.g., check engine light).
5. Poor mobile network or key fob signal issues.
6. System disabled in vehicle settings or Mercedes me app.
7. Faulty RES control module, antenna, or wiring issues.
8. Software glitches or calibration errors.
How to Diagnose Remote Engine Start Issues
Begin by checking whether all vehicle doors, trunk, and hood are fully closed and the vehicle is locked. Ensure sufficient fuel level and battery voltage. Verify mobile network connection for Mercedes me app control. Using Mercedes-Benz diagnostic tools such as Xentry, DTS Monaco, or the MBCOD Box with ELM327, scan for fault codes such as B2xxx (antenna fault), U0xxx (communication errors), or P0xxx (engine start restrictions). Check live data for RES activation conditions and control module status.
How to Fix Remote Engine Start Not Available
Steps to restore functionality include:
1. Ensure all doors, hood, and trunk are closed and the vehicle is locked.
2. Refuel the vehicle if the fuel level is critically low.
3. Charge or replace weak batteries (main or auxiliary).
4. Repair or replace faulty RES control module, antennas, or wiring.
5. Update or reprogram the RES software via diagnostic tools.
6. Re-enable Remote Engine Start in vehicle or app settings if disabled.
7. Clear stored fault codes and test system operation via key fob and Mercedes me app.
Preventive Maintenance for Remote Engine Start
To prevent RES malfunctions, maintain healthy batteries, keep vehicle software updated, and ensure doors and trunk close properly. Regularly check for system updates in the Mercedes me app and avoid aftermarket modifications that may interfere with antennas or control modules.
When to Contact a Specialist
If the ‘Remote Engine Start Not Available’ warning persists despite meeting all conditions, professional diagnostics are required. At MBCOD in Dubai, we specialize in remote start system diagnostics, ECU programming, and Mercedes me connectivity support. We also provide mobile diagnostics and electrical repairs across Dubai, Abu Dhabi, Sharjah, and Ajman.
Conclusion
The ‘Remote Engine Start Not Available’ message can be caused by simple conditions such as open doors or more complex issues like faulty modules. Timely troubleshooting and repairs ensure convenience and system reliability. Trust MBCOD in Dubai and across the UAE for expert Mercedes-Benz Remote Engine Start diagnostics and repairs.