Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the switch that tells the car to stop charging the battery. It's like a light switch that isn't working right.
The P2D79 code indicates a malfunction in the circuit responsible for stopping the charging process of the vehicle's battery.
The Charging Stop Switch Circuit is designed to interrupt the charging process of the vehicle's battery when necessary. A fault in this circuit can prevent the battery from charging properly or stopping the charge when required, potentially leading to battery overcharging or undercharging.
• Battery not charging
• Battery overcharging
• Warning light on dashboard
• Faulty charging stop switch
• Damaged wiring or connectors
• Malfunctioning control module
Circuit: A complete and closed path around which a circulating electric current can flow.
Control Module: A device that manages the operation of various systems in the vehicle.
• Inspect the charging stop switch for physical damage.
• Check the wiring and connectors for any signs of wear or damage.
• Test the control module for proper operation.
• Replace the faulty charging stop switch.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the control module if necessary.
• Multimeter
• OBD-II scanner
• Screwdriver set
$100 - $300
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regularly inspect battery charging components.
• Ensure all electrical connections are secure.
• Perform routine maintenance checks.
Electrical Circuit Issue
• Avoid charging the battery until the issue is resolved.
• Consult a professional mechanic for diagnosis and repair.
Check your vehicle's warranty coverage for electrical components.
This code has been associated with electrical circuit issues in newer vehicle models with advanced charging systems.
Moderate – Addressing this issue promptly can prevent battery damage.
Driving with a malfunctioning charging system can lead to battery failure, which may cause the vehicle to stall.
• Vehicle in ignition on position
• Battery charging system active
The charging stop switch is typically located near the battery or within the engine bay.
Q: Can I drive with a P2D79 code?
A: It's not recommended as it may lead to battery issues.
Q: How do I reset the P2D79 code?
A: After repairs, 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.
View on Amazon
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.
View on Amazon
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.