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 a sensor in the car's air conditioning system. It's like a thermometer that is reading too high, and it's telling the car's computer that something is wrong.
This code indicates that the voltage detected by the A/C coolant heater phase W voltage sensor is higher than the expected range.
The A/C coolant heater phase W voltage sensor is responsible for monitoring the voltage in the A/C coolant heater circuit. If the voltage is too high, it could indicate a fault in the sensor, wiring, or the heater itself. This can affect the performance of the air conditioning system.
• Air conditioning not working properly
• Check engine light is on
• Unusual noises from the A/C system
• Faulty A/C coolant heater phase W voltage sensor
• Wiring issues such as short circuits or open circuits
• Faulty air conditioning control module
A/C: Air Conditioning
OBD-II: On-Board Diagnostics, Second Generation
HVAC: Heating, Ventilation, and Air Conditioning
• Use an OBD-II scanner to confirm the code
• Inspect the wiring and connections to the sensor
• Test the sensor for proper operation
• Replace the faulty sensor
• Repair or replace damaged wiring
• Replace the air conditioning control module if necessary
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regular maintenance of the A/C system
• Check wiring connections periodically
• Use quality replacement parts
Sensor Issue
• Have the issue diagnosed by a professional
• Avoid using the A/C until the problem is fixed
Check with the vehicle manufacturer for warranty coverage on sensors and electrical components.
This code has been associated with issues in vehicles with advanced climate control systems, particularly in hybrid or electric models.
Moderate – The A/C system may not function properly, but it does not immediately affect vehicle safety.
Driving with a malfunctioning A/C system can lead to discomfort and potential distraction. Ensure repairs are conducted by a qualified technician.
• Engine running
• A/C system activated
The A/C coolant heater phase W voltage sensor is typically located near the A/C compressor or within the HVAC unit.
Q: Can I drive my car with this code?
A: Yes, but the A/C system may not work properly, which can be uncomfortable in hot weather.
Q: Will this code affect my car's engine?
A: No, this code specifically relates to the air conditioning system and does not impact engine performance.
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.