AutoCodes – Chevrolet – U151C Chevrolet

U151C Chevrolet Code - HVAC Control Module Lost Communication With Auxiliary HVAC Control Module On LIN Bus

Quick Answer

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty Auxiliary Heating, Ventilation, and Air Conditioning (HVAC) Control Module, Auxiliary HVAC Control Module harness is open or shorted, Auxiliary HVAC Control Module circuit poor electrical connection. 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: U151C Chevrolet indicates HVAC Control Module Lost Communication With Auxiliary HVAC Control Module On LIN Bus.
Common causes: Common causes include Faulty Auxiliary Heating, Ventilation, and Air Conditioning (HVAC) Control Module, Auxiliary HVAC Control Module harness is open or shorted, Auxiliary HVAC Control Module circuit poor electrical connection.
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.

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Code Popularity 1,478

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U151C Chevrolet Description

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. The serial data is transmitted over a LIN circuit between a master control module and other LIN devices within a particular subsystem. If serial data communication is lost between any of the LIN devices on the LIN bus network, the master control module will set a no communication code against the non-communicating LIN device. The Diagnostic Trouble Code (DTC) will set when a supervised periodic message to the Heating, Ventilation, and Air Conditioning (HVAC) Control Module from the Auxiliary HVAC Control Module has not been received.

OBDII Code U151C Chevrolet - HVAC Control Module Lost Communication With Auxiliary HVAC Control Module On LIN Bus - AutoCodes.com — U151C Chevrolet Code - HVAC Control Module Lost Communication With Auxiliary HVAC Control Module On LIN Bus

What does this mean?

What are the Possible Causes of the DTC U151C Chevrolet?

Faulty Auxiliary Heating, Ventilation, and Air Conditioning (HVAC) Control Module
Auxiliary HVAC Control Module harness is open or shorted
Auxiliary HVAC Control Module circuit poor electrical connection
Faulty HVAC Control Module

How to Fix the DTC U151C Chevrolet?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U151C Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U151C Chevrolet Code

1. What are common symptoms of OBDII code U151C on a Chevrolet related to HVAC control module communication issues?

- Common symptoms include loss of communication with the auxiliary HVAC control module, malfunctioning HVAC controls, and inoperative auxiliary HVAC functions.

2. What can cause the U151C code indicating lost communication between the HVAC control module and auxiliary HVAC control module on a Chevrolet?

- Possible causes include a faulty auxiliary HVAC control module, issues with the LIN bus communication network, damaged wiring or connectors, or a malfunctioning HVAC control module.

3. How can I diagnose the U151C code on my Chevrolet related to HVAC control module communication problems?

- Diagnosis involves using a scan tool to retrieve the trouble code, checking for additional codes related to communication issues, inspecting wiring and connectors, and verifying the operation of the auxiliary HVAC components.

4. What are some repair tips for addressing the U151C trouble code on a Chevrolet with HVAC communication problems?

- Repair tips include checking and repairing any damaged wiring or connectors, replacing a faulty auxiliary HVAC control module, reprogramming control modules if necessary, and ensuring proper communication on the LIN bus network.

5. Can I continue driving my Chevrolet with the U151C code related to HVAC module communication issues?

- It is recommended to address the communication problem promptly to ensure proper operation of the HVAC system. Continuing to drive with unresolved communication issues may lead to further malfunctions or loss of HVAC functionality.

6. Will resetting the trouble codes clear the U151C code indicating lost communication between the HVAC control module and auxiliary module on a Chevrolet?

- Resetting the trouble codes may temporarily clear the code, but if the underlying communication issue persists, the code is likely to return. It is important to diagnose and repair the root cause of the problem.

7. Is it possible to repair the U151C code related to HVAC communication problems on a Chevrolet without professional help?

- Depending on your experience and tools available, you may be able to address simple issues like checking wiring connections. However, complex diagnostics and repairs involving control modules or bus communication may require professional assistance.

8. How much does it typically cost to repair the U151C trouble code indicating lost communication between HVAC modules on a Chevrolet?

- Repair costs can vary depending on the root cause of the communication issue, parts needed for replacement, labor rates, and dealership or repair shop pricing. It is advisable to obtain estimates from qualified technicians.

9. Can extreme weather conditions or environmental factors contribute to the U151C code on a Chevrolet related to HVAC module communication issues?

- Extreme temperatures, moisture, or physical damage to wiring caused by environmental factors can potentially affect the communication between HVAC modules and trigger the U151C trouble code.

10. Are there any recalls or technical service bulletins related to the U151C code on Chevrolet vehicles with HVAC control module communication problems?

- It is recommended to check with Chevrolet dealerships, online resources, or contact customer service to inquire about any recalls or technical service bulletins specifically addressing the U151C code and related communication issues.