AutoCodes – GMC – U0133 GMC

U0133 GMC Code - Lost Communication With Air Suspension Control Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Air Suspension Control Module, Air Suspension Control Module harness is open or shorted, Air Suspension 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: U0133 GMC indicates Lost Communication With Air Suspension Control Module.
Common causes: Common causes include Faulty Air Suspension Control Module, Air Suspension Control Module harness is open or shorted, Air Suspension 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 462

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0133 GMC Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Air Suspension Control Module has not been received.

OBDII Code U0133 GMC - Lost Communication With Air Suspension Control Module - AutoCodes.com — U0133 GMC Code - Lost Communication With Air Suspension Control Module

What does this mean?

What are the Possible Causes of the DTC U0133 GMC?

Faulty Air Suspension Control Module
Air Suspension Control Module harness is open or shorted
Air Suspension Control Module circuit poor electrical connection

How to Fix the DTC U0133 GMC?

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 U0133 GMC 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 U0133 GMC Code

1. What are the common symptoms of OBDII code U0133 GMC (Lost Communication With Air Suspension Control Module)?

- Common symptoms include malfunctioning air suspension system, illuminated warning lights (such as the check engine light or suspension warning light), and issues with ride quality.

2. What are the possible causes of OBDII code U0133 GMC?

- The code U0133 GMC can be triggered by issues such as a faulty air suspension control module, damaged wiring or connectors, communication network issues, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose the cause of OBDII code U0133 GMC?

- Diagnosing the code typically involves using a professional OBDII scanner to retrieve the specific fault codes, checking the wiring and connectors for damage, testing the air suspension control module, and ensuring proper communication on the network.

4. What are some repair tips for resolving OBDII code U0133 GMC?

- Repair tips include repairing or replacing damaged wiring or connectors, resetting the air suspension control module, reprogramming modules if necessary, and ensuring all components are properly connected and functioning.

5. Can OBDII code U0133 GMC be fixed at home, or do I need a professional mechanic?

- While some basic troubleshooting steps can be done at home, resolving OBDII code U0133 GMC may require professional diagnostic equipment and expertise, especially when dealing with complex communication network issues.

6. Is it safe to drive with OBDII code U0133 GMC active?

- It is not recommended to drive with the code active, as it can affect the performance and safety of the air suspension system. It is advisable to address the issue promptly to prevent further damage.

7. Will resetting the OBDII code U0133 GMC make it go away permanently?

- Resetting the code may temporarily clear the warning lights, but if the underlying issue is not resolved, the code is likely to reappear. It is important to diagnose and fix the root cause of the problem.

8. How much does it typically cost to repair OBDII code U0133 GMC at a dealership or repair shop?

- The cost of repairing the code can vary depending on the specific issue, labor rates, and parts required. It is advisable to obtain quotes from different shops and dealerships to compare prices.

9. Can a weak car battery cause OBDII code U0133 GMC to appear?

- Yes, a weak or failing car battery can sometimes cause communication errors and trigger codes like U0133 GMC. It is recommended to ensure the battery is in good condition when diagnosing this issue.

10. Are there any recalls or technical service bulletins related to OBDII code U0133 GMC for GMC vehicles?

- It is advisable to check with the manufacturer or a dealership for any recalls or technical service bulletins related to OBDII code U0133 GMC for specific GMC vehicle models.