U0139 - DTC U0139 - Lost Communication with Vehicle Dynamics Control Module (Common in 2011-2018 Jeep Grand Cherokee)

Quick Answer

U0139 means: U0139 signifies a communication breakdown with the Vehicle Dynamics Control Module, impacting vehicle stability systems.

Fix: Check and replace faulty components Cost: $100 - $300 Time: 90-180 minutes

Can I drive with U0139? Immediate attention is recommended. Driving without resolving this issue may compromise vehicle safety.

Common Questions

What does U0139 mean and how does it affect my car?

U0139 indicates a loss of communication with the Vehicle Dynamics Control Module, which can impact vital safety features like traction control and anti-lock brakes. Ignoring this can lead to increased risk of accidents.

What are the most common causes of U0139 and how much does it cost to fix?

The most common causes include damaged wiring (50% likelihood) and a faulty module (30% likelihood). Repair costs can range from $100 to $800, depending on the problem.

Can I drive my car with U0139 or should I stop immediately?

Driving with a U0139 code is risky. Since it affects vehicle stability systems, it's advisable to stop driving and seek a professional diagnosis.

How can I diagnose U0139 myself using GeekOBD APP?

To diagnose U0139 with the GeekOBD APP, first connect the scanner to the OBD2 port, scan for codes, and check for freeze frame data. This data helps you identify when the fault occurred and under what conditions.

What vehicles are most commonly affected by U0139?

U0139 is frequently reported in models such as the 2011-2018 Jeep Grand Cherokee, 2013-2017 Dodge Durango, and select Chrysler models. Check for any recalls or technical service bulletins related to communication issues.

How can I prevent U0139 from happening again?

Regular vehicle maintenance, including checking and securing all wiring harnesses, can help prevent U0139. Additionally, avoid aftermarket modifications that could interfere with the vehicle's electrical system.

What is U0139?

The Diagnostic Trouble Code (DTC) U0139 indicates a loss of communication with the Vehicle Dynamics Control Module (VDCM). This module plays a crucial role in managing various vehicle systems, including traction control, stability control, and anti-lock braking systems. When a vehicle's onboard diagnostic system detects an issue where it can no longer communicate with the VDCM, it triggers the U0139 code. This communication failure can result from a variety of issues, such as faulty wiring, damaged connectors, or even a malfunctioning module itself. In practical terms, if you encounter this code, you may notice symptoms like warning lights on your dashboard, a decrease in vehicle performance, or even safety features like traction control becoming non-operational. Ignoring this code can lead to further complications, including potential safety risks while driving, as your vehicle's stability systems may not function correctly. Therefore, addressing U0139 promptly is essential for maintaining both the performance and safety of your vehicle.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U0139 is present:

Check engine light stays on constantly, indicating a serious system malfunction that needs immediate diagnostics.
Traction control warning light illuminates intermittently, which could affect your ability to maintain control in slippery conditions.
Braking performance may feel inconsistent, as the anti-lock system may not engage properly, increasing stopping distances.
Unusual warning sounds or alerts from the dashboard, indicating a failure in the communication lines.
Increased fuel consumption or poor acceleration, hinting at a possible impact on engine management systems.

Possible Causes

Most common causes of U0139 (ordered by frequency):

Damaged wiring or poor connections account for about 50% of U0139 occurrences, often due to wear and tear or environmental factors.
A malfunctioning Vehicle Dynamics Control Module itself can cause a communication error, with a likelihood of around 30%. This can happen if the module is internally damaged or has a software issue.
Corrosion at the connection points, which might not be immediately visible, can cause intermittent communication failures, accounting for about 15% of cases.
Less common causes include issues with the vehicle's main computer or other related control modules that can indirectly affect VDCM communication.
In rare cases, aftermarket modifications to the vehicle’s electrical system can lead to communication errors, impacting about 5% of vehicles.

U0139 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repair or replace damaged wiring and connectors leading to the VDCM.

Total: $100 - $300
Success rate: 80%

Vehicle Dynamics Control Module Replacement

Replacing a faulty VDCM with a new or refurbished unit.

Total: $400 - $800
Success rate: 95%

Money-Saving Tips for U0139

Start with the most common and least expensive repairs first
Use GeekOBD APP to confirm diagnosis before replacing expensive parts
Consider preventive maintenance to avoid future occurrences
Compare prices for OEM vs aftermarket parts based on your needs
Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional U0139 Diagnosis Process

Follow these systematic steps to accurately diagnose U0139. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes). Look closely at the harness leading to the VDCM.