U0165 Code - Lost Communication With Rear HVAC Control Module
Quick Answer
The U0165 diagnostic trouble code (DTC) indicates that there is a communication failure between the vehicle's onboard computer system and the rear HVAC (Heating, Ventilation, and Air Conditioning) control module. Common causes include Faulty rear HVAC control module, Wiring or connection issues between the onboard computer system and the rear HVAC control module, Corrosion or damage to the communication lines. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- U0165 indicates Lost Communication With Rear HVAC Control Module.
- Common causes
- Common causes include Faulty rear HVAC control module, Wiring or connection issues between the onboard computer system and the rear HVAC control module, Corrosion or damage to the communication lines.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code U0165 Description
The U0165 diagnostic trouble code (DTC) indicates that there is a communication failure between the vehicle's onboard computer system and the rear HVAC (Heating, Ventilation, and Air Conditioning) control module. This communication failure can disrupt the proper functioning of the rear HVAC system, leading to potential issues with temperature control, fan speed, and overall climate control in the vehicle. The rear HVAC control module is responsible for regulating the airflow and temperature in the rear of the vehicle, ensuring passenger comfort.
Common Causes of U0165
- Faulty rear HVAC control module
- Wiring or connection issues between the onboard computer system and the rear HVAC control module
- Corrosion or damage to the communication lines
- Software or programming issues within the vehicle's computer system
Symptoms of U0165
- Inconsistent temperature control in the rear of the vehicle
- Lack of airflow from the rear HVAC vents
- Unresponsive rear HVAC controls
- Check engine light illuminated on the dashboard
How to Fix U0165
- Diagnose the specific cause of the communication failure using a diagnostic scanner to retrieve the DTC and identify the source of the issue.
- Inspect the wiring and connections between the onboard computer system and the rear HVAC control module for any signs of damage or corrosion.
- Test the rear HVAC control module to determine if it is functioning correctly or if it needs to be replaced.
- Reset the onboard computer system and clear the DTC to see if the communication is restored.
- If necessary, replace the rear HVAC control module or repair any damaged wiring to resolve the communication failure.
Cost to Fix U0165
The typical repair costs for addressing a U0165 code can vary depending on the specific cause of the communication failure and the extent of the repairs needed. In general, replacing a faulty rear HVAC control module can cost between $200 and $500, including parts and labor. However, additional costs may be incurred for diagnosing the issue, repairing wiring or connections, or reprogramming the vehicle's computer system. It's advisable to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate based on the specific circumstances of your vehicle. Keep in mind that labor rates can vary significantly between different locations and service providers, so it's essential to research local rates for a more precise estimate.
Need more information about the U0165 code?
Need more information on how to fix the U0165 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the U0165 code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about U0165 Code
No Frequently Asked Questions about U0165 Code found.
Discuss the causes and fixes for U0165 OBDII Code
Code U0165 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.