AutoCodes – Generic – U183C

U183C Code - Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On Powertrain Expansion Communication Bus

Quick Answer

The serial data circuit is the means by which the devices in the vehicle communicate with each other. Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 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: U183C indicates Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On Powertrain Expansion Communication Bus.
Common causes: Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 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 606

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 U183C 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 U183C - Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On Powertrain Expansion Communication Bus - AutoCodes.com — U183C Code - Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On Powertrain Expansion Communication Bus

What does this mean?

What are the Possible Causes of the DTC U183C?

Faulty Hybrid/EV Powertrain Control Module 2
Hybrid/EV Powertrain Control Module 2 harness is open or shorted
Hybrid/EV Powertrain Control Module 2 circuit poor electrical connection

How to Fix the DTC U183C?

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 U183C 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 U183C code?

Need more information on how to fix the U183C code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U183C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U183C Buick — Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On Powertrain Expansion Communication Bus
U183C Cadillac — Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On Powertrain Expansion Communication Bus
U183C Chevrolet — Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On Powertrain Expansion Communication Bus
U183C GMC — Auxiliary Transmission Fluid Pump Control Module Lost Communication With Hybrid/EV Powertrain Control Module 2 On Powertrain Expansion Communication Bus

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 U183C Code

What does the OBDII code U183C indicate?

The code U183C indicates that there is a loss of communication between the auxiliary transmission fluid pump control module and the hybrid/EV powertrain control module 2 on the powertrain expansion communication bus.

What are the common symptoms associated with the U183C code?

Common symptoms may include warning lights on the dashboard, erratic transmission behavior, reduced power or performance, and potential overheating of the transmission.

What could cause the U183C code to trigger?

Possible causes include faulty wiring or connections in the communication circuit, a malfunctioning auxiliary transmission fluid pump control module, or issues with the hybrid/EV powertrain control module itself.

How can I diagnose the U183C code?

To diagnose the U183C code, use an OBDII scanner to confirm the code, check for additional related codes, inspect wiring and connectors for damage, and test the affected modules for proper operation.

What are some common repair solutions for the U183C code?

Repairs may involve repairing or replacing damaged wiring or connectors, replacing the auxiliary transmission fluid pump control module, or reprogramming or replacing the hybrid/EV powertrain control module.

Can I continue driving my vehicle if the U183C code is present?

It is not recommended to continue driving your vehicle with the U183C code present, as it can lead to transmission issues and potential damage if the problem is not addressed.

Is it possible to reset the code without fixing the underlying issue?

Yes, you can reset the code using an OBDII scanner, but if the underlying communication issue is not resolved, the code will likely reappear.

How can I prevent the U183C code from occurring in the future?

To prevent the U183C code, regularly inspect and maintain the wiring and connectors in the transmission and powertrain systems, and ensure that software updates for the vehicle's modules are applied as needed.

Should I consult a professional mechanic for the U183C code?

Yes, consulting a professional mechanic is advisable, especially if you are not experienced with automotive diagnostics, as they can properly diagnose and repair the issue effectively.