U1016 moderate

GM - Class 2 Communication Malfunction With HVAC Module

Can I Drive?
Short Distances Only
DIY Difficulty
hard
Estimated Cost
$200 - $800 (parts and labor)

What does U1016 mean?

The U1016 code means the vehicle's onboard diagnostic system has detected: GM - Class 2 Communication Malfunction With HVAC Module. This is a moderate severity code.

Common Symptoms

  • Affected system not communicating
  • Warning light for affected system
  • Feature associated with module disabled
  • Intermittent system operation

Probable Causes (Ranked by Likelihood)

  • Class 2 bus fault at module connector Very High
  • Module internal communication failure High
  • Wiring damage in Class 2 circuit Moderate
  • Connector corrosion Low

Step-by-Step Diagnostic Procedure

  1. Check module connector for corrosion

  2. Test Class 2 voltage at module

  3. Verify module power and ground

  4. Scan module for stored codes

Frequently Asked Questions

Can I drive with U1016?

Depends on which module is affected. Check the specific system.

What causes U1016?

Usually connector corrosion or wiring damage in the Class 2 circuit.

Is U1016 GM-specific?

Yes, this is a GM manufacturer-specific communication code.

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