u0164 lost communication with air conditioner ecu

OBD2 Code: U0164

Description: Lost communication with air conditioner ECU.

Definition: This code indicates that the vehicle’s main control module has lost communication with the air conditioner’s electronic control unit (ECU). The loss of communication can be due to a wiring issue, a faulty air conditioner ECU, or a problem within the network that connects these components.

: Lost communication with air conditioner ECU
Severity: Moderate

Common Causes

U0164 – Lost Communication with Air Conditioner ECU

Common Causes:

• Faulty air conditioner ECU
• Wiring or connection issues between the diagnostic tool and the air conditioner ECU
• Interference from other electronic devices affecting communication
• Power or ground supply problems to the air conditioner ECU

 

Common Misdiagnosis

OBD2 Code: U0164
Description: Lost Communication with Air Conditioner ECU
Common Misdiagnosis: Faulty air conditioning control module, when the issue may actually be due to a wiring problem or a faulty connector.

 

Common Diagnostic Steps

OBD2 Code: U0164
Description: Lost Communication with Air Conditioner ECU

• Check for any other stored trouble codes that might indicate a broader communication issue.
• Inspect the wiring and connectors between the air conditioner ECU and the vehicle’s main control module for damage or disconnection.
• Test the power supply and ground connections to the air conditioner ECU to ensure they are within specifications.
• Use a scan tool to attempt communication with the air conditioner ECU. If unsuccessful, consider replacing or reprogramming the ECU.
• If applicable, check for any technical service bulletins (TSBs) related to this code for your specific vehicle model.