AutoCodes – GMC – U183B GMC

U183B GMC 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 GMC 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 512

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 GMC 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 GMC - Auxiliary Transmission Fluid Pump Control Module Lost Communication With Transmission Control Module - AutoCodes.com — U183B GMC 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 GMC?

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 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 U183B 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 U183B GMC Code

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

- Common symptoms include transmission shifting issues, poor performance, and illuminated warning lights on the dashboard.

2. What does the code U183B GMC mean?

- This code indicates that the Auxiliary Transmission Fluid Pump Control Module has lost communication with the Transmission Control Module.

3. What are the possible causes of code U183B GMC?

- The possible causes include faulty wiring connections, a defective control module, communication network issues, or a malfunctioning transmission control module.

4. How can I diagnose the cause of code U183B GMC?

- Diagnosing the issue typically involves checking the wiring connections, testing the communication network, inspecting the control modules, and scanning for any related fault codes.

5. What should I do if I encounter code U183B GMC?

- It is recommended to have the vehicle diagnosed by a professional technician to accurately identify the root cause of the communication failure between the control modules.

6. Can I continue driving with OBDII code U183B GMC?

- It is not recommended to continue driving with this code present, as it may lead to further transmission problems and potential safety hazards.

7. How is OBDII code U183B GMC typically repaired?

- The repair process may involve fixing or replacing damaged wiring, repairing the communication network, replacing the control modules, or reprogramming the modules as needed.

8. Are there any DIY tips for addressing code U183B GMC?

- DIY tips include checking for loose or damaged wiring, ensuring proper module connections, and clearing the code with an OBDII scanner to see if it returns.

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

- Repair costs can vary depending on the specific cause of the issue, but it is advisable to budget for potential module replacements or repairs, which can range from a few hundred to over a thousand dollars.

10. Is it possible to prevent OBDII code U183B GMC from occurring?

- While some causes may be unavoidable, regular vehicle maintenance, including checking and maintaining electrical connections, can help reduce the risk of encountering communication issues between control modules.