AutoCodes – Buick – U183B Buick

U183B Buick Code - Auxiliary Transmission Fluid Pump Control Module Lost Communication With Transmission Control Module

Quick Answer

The serial data circuit is the means by which the devices in the vehicle communicate with each other. Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission 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: U183B Buick indicates Auxiliary Transmission Fluid Pump Control Module Lost Communication With Transmission Control Module.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission 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 547

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U183B Buick Description

The serial data circuit is the means by which the devices in the vehicle communicate with each other. Once the scan tool is connected to the serial data circuit through the Data Link Connector (DLC), the scan tool can be used to monitor each device for diagnostic purposes and to check for Diagnostic Trouble Code (DTC). When the vehicle is ON, each device communicating on the serial data circuit sends a state of health message to ensure that the device is operating properly. When a device stops communicating on the serial data circuit, for example, if the device loses power or ground, the state of health message it normally sends on the serial data circuit disappears. Other devices on the serial data circuit, which expect to receive that state of the health message, detect its absence; those devices in turn set a DTC associated with the loss of the state of health of the non-communicating device. A loss of serial data communications DTC does not represent a failure of the devices that contain the stored DTC. The DTC will set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U183B Buick - Auxiliary Transmission Fluid Pump Control Module Lost Communication With Transmission Control Module - AutoCodes.com — U183B Buick Code - Auxiliary Transmission Fluid Pump Control Module Lost Communication With Transmission Control Module

What does this mean?

What are the Possible Causes of the DTC U183B Buick?

Faulty Transmission Control Module (TCM)
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC U183B Buick?

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 U183B Buick 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 U183B Buick Code

1. What does the OBDII code U183B mean on a Buick?

The U183B code indicates that the Auxiliary Transmission Fluid Pump Control Module has lost communication with the Transmission Control Module (TCM).

2. What are the common symptoms of the U183B code?

Symptoms may include erratic shifting, failure to engage gears, transmission overheating, or the vehicle entering limp mode.

3. What causes the U183B code to appear?

Possible causes include a faulty Auxiliary Transmission Fluid Pump Control Module, damaged wiring or connectors, a failing TCM, or software issues in the control modules.

4. Can I drive my Buick with the U183B code active?

Driving with this code is not recommended, as it could lead to transmission overheating or further damage due to lack of proper fluid circulation.

5. How do I diagnose the U183B code?

Start by checking for damaged or corroded wiring and connectors between the Auxiliary Transmission Fluid Pump Control Module and the TCM. Use a diagnostic scanner to verify the fault and check for other related codes.

6. What are common fixes for the U183B code?

Repairs may include replacing damaged wiring or connectors, reprogramming the control modules, or replacing the Auxiliary Transmission Fluid Pump Control Module or TCM if defective.

7. How much does it cost to repair the U183B code?

Repair costs depend on the issue but can range from $100 for simple wiring repairs to $1,000 or more for module replacement and programming.

8. Can a software update fix the U183B code?

Yes, in some cases, a software update for the Auxiliary Transmission Fluid Pump Control Module or TCM may resolve communication issues.

9. What tools are needed to troubleshoot the U183B code?

You'll need an advanced diagnostic scanner capable of reading transmission-related codes, a multimeter for testing wiring, and possibly OEM service manuals for wiring diagrams.

10. Is the U183B code specific to Buicks?

While the U183B code is not exclusive to Buick, it is commonly associated with GM vehicles that use similar transmission systems.