Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that there's a problem with the car's power supply system, which helps turn on and off different parts of the car.
The P15ED code indicates an issue with the power supply circuit that manages electrical power to various components when the ignition is on.
The code P15ED is triggered when the Engine Control Module (ECM) detects a fault in the power supply circuit associated with Terminal 15N_2 / 87_2. This circuit is responsible for supplying power to various vehicle systems when the ignition is turned on. A malfunction here can affect the operation of multiple systems that rely on this power supply.
• Vehicle may not start
• Electrical components may not work properly
• Warning lights on the dashboard
• Faulty relay or fuse
• Wiring issues such as a short or open circuit
• Faulty ignition switch
ECM: Engine Control Module
Relay: An electrically operated switch
• Check and test the related fuses and relays
• Inspect wiring for damage or disconnection
• Test the ignition switch for proper operation
• Replace faulty fuses or relays
• Repair or replace damaged wiring
• Replace the ignition switch if found faulty
• Multimeter
• Fuse puller
• Screwdriver set
$100 - $300
Moderate
• Mercedes-Benz C-Class
• Mercedes-Benz E-Class
• Mercedes-Benz S-Class
• Regularly inspect and maintain electrical connections
• Replace fuses and relays as needed
• Ensure the ignition system is serviced regularly
Electrical System Issue
• Avoid driving the vehicle until the issue is resolved to prevent further damage.
• Consult a professional mechanic for accurate diagnosis and repair.
Repairs may be covered under the vehicle's electrical system warranty if applicable.
This code has been associated with issues in vehicles with complex electrical systems, particularly in luxury models.
Moderate – It is advisable to address this issue soon to avoid potential electrical failures.
Driving with unresolved electrical issues can lead to vehicle malfunctions and safety hazards.
• Ignition in the 'ON' position
• Engine not running
The components related to this code are typically located in the vehicle's fuse box or near the ignition switch.
Q: Can I drive with a P15ED code?
A: It's not recommended to drive with this code as it may lead to electrical failures.
Q: How do I reset the P15ED code?
A: Fix the underlying issue and then use an OBD-II scanner to clear the code.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
View options on Amazon
Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.