AutoCodes – Generic – U183B

U183B 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 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 666

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 Jun 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U183B 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 - Auxiliary Transmission Fluid Pump Control Module Lost Communication With Transmission Control Module - AutoCodes.com — U183B 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?

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?

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 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.

Need more information about the U183B code?

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Need Help with the Code?

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Information for Specific Makes

U183B Buick — Auxiliary Transmission Fluid Pump Control Module Lost Communication With Transmission Control Module
U183B Cadillac — Auxiliary Transmission Fluid Pump Control Module Lost Communication With Transmission Control Module
U183B Chevrolet — Auxiliary Transmission Fluid Pump Control Module Lost Communication With Transmission Control Module
U183B GMC — Auxiliary Transmission Fluid Pump Control Module Lost Communication With Transmission Control Module

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 Code

1. What are the common symptoms of OBDII code U183B?

The common symptoms of code U183B include transmission shifting issues, harsh shifting, and the transmission going into limp mode.

2. What are the possible causes of code U183B?

Potential causes of code U183B include a faulty auxiliary transmission fluid pump control module, a malfunctioning transmission control module, wiring issues, or poor electrical connections.

3. How can I diagnose OBDII code U183B?

Diagnosing code U183B typically involves using a diagnostic scanner to retrieve the code, checking for any other related codes, and performing a thorough inspection of the wiring and connections between the auxiliary transmission fluid pump control module and the transmission control module.

4. Can I still drive my vehicle with OBDII code U183B?

It is not recommended to drive your vehicle with code U183B present, as it can lead to further transmission damage and potential safety hazards. It is best to address the issue promptly.

5. How can I repair OBDII code U183B?

Repairing code U183B may involve replacing the faulty auxiliary transmission fluid pump control module, addressing any wiring or connection issues, or reprogramming the transmission control module.

6. Will resetting the trouble codes make OBDII code U183B go away?

Resetting the trouble codes may temporarily clear the code, but if the underlying issue causing code U183B is not addressed, the code is likely to return.

7. Is it safe to continue driving if the transmission goes into limp mode due to code U183B?

Driving in limp mode is a safety feature designed to protect the transmission from further damage. While it is safe to drive in limp mode for a short distance, it is recommended to have the issue diagnosed and repaired as soon as possible.

8. Can a DIY enthusiast fix OBDII code U183B at home?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address code U183B at home by replacing the auxiliary transmission fluid pump control module or checking for wiring issues. However, it is recommended to seek professional help for an accurate diagnosis and repair.

9. How much does it typically cost to repair OBDII code U183B?

The cost of repairing code U183B can vary depending on the underlying issue, the cost of parts, and labor rates. It is advisable to obtain quotes from reputable repair shops to get an accurate estimate.

10. Can OBDII code U183B cause permanent damage to the transmission if not repaired promptly?

If left unaddressed, code U183B can potentially cause permanent damage to the transmission due to incorrect fluid flow or control issues. It is crucial to address the problem promptly to prevent further damage.