AutoCodes – Chevrolet – U1839 Chevrolet

U1839 Chevrolet Code - Auxiliary Transmission Fluid Pump Control Module Lost Communication With Engine 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 Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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: U1839 Chevrolet indicates Auxiliary Transmission Fluid Pump Control Module Lost Communication With Engine Control Module.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 734

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U1839 Chevrolet 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 U1839 Chevrolet - Auxiliary Transmission Fluid Pump Control Module Lost Communication With Engine Control Module - AutoCodes.com — U1839 Chevrolet Code - Auxiliary Transmission Fluid Pump Control Module Lost Communication With Engine Control Module

What does this mean?

What are the Possible Causes of the DTC U1839 Chevrolet?

Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC U1839 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 U1839 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.

Need more information about the U1839 Chevrolet code?

Need more information on how to fix the U1839 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1839 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 U1839 Chevrolet Code

1. What are the common symptoms of OBDII code U1839 in a Chevrolet related to the Auxiliary Transmission Fluid Pump Control Module?

- Common symptoms include transmission shifting issues, reduced fuel efficiency, and the illumination of the check engine light.

2. What are some possible causes for the U1839 code in a Chevrolet?

- Possible causes include a faulty auxiliary transmission fluid pump control module, a communication error between modules, wiring issues, or a malfunction in the engine control module.

3. How can I diagnose the U1839 code in my Chevrolet?

- Diagnosing the U1839 code typically involves using an OBDII scanner to identify the specific module communication error and checking the wiring connections between the modules.

4. Is it safe to continue driving with the U1839 code present in my Chevrolet?

- It is not recommended to continue driving with the U1839 code as it can lead to further transmission problems and potential damage to other components.

5. Can I repair the U1839 code in my Chevrolet on my own?

- While some DIY enthusiasts may attempt to troubleshoot and repair the U1839 code, it is recommended to seek professional help to accurately diagnose and fix the issue.

6. How much does it typically cost to repair the U1839 code in a Chevrolet?

- The cost of repairing the U1839 code can vary depending on the specific issue and the labor rates of the repair shop. It is advisable to get a few quotes from different mechanics.

7. Will resetting the trouble codes make the U1839 code go away temporarily?

- Resetting the trouble codes may temporarily clear the U1839 code, but if the underlying issue is not fixed, the code is likely to reappear once the problem resurfaces.

8. Can a low transmission fluid level cause the U1839 code to trigger in a Chevrolet?

- Yes, a low transmission fluid level can sometimes lead to the U1839 code triggering due to the increased strain on the auxiliary transmission fluid pump.

9. How long does it typically take to repair the U1839 code in a Chevrolet?

- The repair time for the U1839 code can vary depending on the complexity of the issue and the availability of parts. It is best to consult with a mechanic for a more accurate estimate.

10. Are there any preventative maintenance measures I can take to avoid the U1839 code in my Chevrolet?

- Regularly servicing your vehicle, including checking and maintaining proper transmission fluid levels, can help prevent issues that may trigger the U1839 code.