u1152 lost communications with hvac control module

Code: U1152

Description: Lost Communications with HVAC Control Module

Definition: This code indicates that the vehicle’s main computer (PCM) has not received any data from the HVAC control module for a certain period of time. This can be due to a communication error, wiring issue, or failure in the HVAC control module itself.

U1152 – Lost Communication with HVAC Control Module

Severity: Moderate

Common Causes

U1152 – Lost Communications with HVAC Control Module

Common Causes:

• Faulty HVAC control module
• Wiring or connection issues between the HVAC control module and the vehicle’s main computer
• Interference from other electronic devices in the vehicle affecting communication
• Software issues within the vehicle’s network causing a loss of communication

Common Misdiagnosis

OBD2 Code: U1152
Description: Lost Communications with HVAC Control Module
Common Misdiagnosis: Faulty HVAC control module, when the issue may actually be due to wiring problems or a faulty communication bus.

Common Diagnostic Steps

OBD2 Code: U1152
Description: Lost Communications with HVAC Control Module

Common Diagnostic Steps:

• Check for any additional trouble codes that may be related to the communication network.
• Inspect the wiring and connectors between the HVAC control module and other modules on the communication bus for damage or corrosion.
• Verify power and ground connections to the HVAC control module are intact and functioning properly.
• Use a scan tool to check for proper operation of the HVAC system and ensure it is communicating with other modules.
• If equipped, perform a module reset or reprogramming as per manufacturer guidelines.
• If necessary, replace the HVAC control module after confirming it is defective through testing procedures.