In the world of vehicle diagnostics and repair, few things are more frustrating than dealing with a recurring issue that stems from a design oversight. One such issue that has come to light involves the airbag modules on Ram ProMaster vans. While these vehicles are generally reliable workhorses, there’s a critical design flaw that could affect both safety and repair costs.
The Core Problem: Spillage and the Airbag Module
In many Ram ProMaster models, the airbag control module is strategically placed under the center console, specifically beneath the cup holder assembly. On the surface, this seems like a convenient use of space. However, the proximity to drink holders introduces a serious vulnerability: liquid intrusion.
If a beverage spills whether it’s coffee during a morning commute or a bottle of water rolling loose the liquid can easily seep down into the airbag control module. This kind of fluid exposure can cause a range of electrical issues, including:
-
Corrosion of circuit board components
-
Short circuits within the module
-
DTCs (Diagnostic Trouble Codes) related to airbag deployment errors
-
Potential failure of the Supplemental Restraint System (SRS)
No Recall, But a Quiet Update
What’s particularly concerning is that Dodge (Stellantis) has acknowledged the issue by updating the airbag modules they now sell for replacements. These new modules feature improved sealing and better internal protection. However, they have not issued a recall, which leaves many current owners and technicians unaware of the design fault.
This lack of a formal recall means that affected vehicle owners are often on the hook for diagnosis, parts, and labor costs even though the root cause is a manufacturer design oversight.
Diagnosing the Problem: Reset or Full Disassembly?
If you’re dealing with airbag-related DTCs on a Ram ProMaster, the key question becomes: Should you reset the airbag module or open it up for a deeper inspection?
Option 1: Flash Reset
A common first step is performing a software reset or clearing DTCs via an OBD-II diagnostic tool. This is sometimes referred to as “flashing” the airbag module. While this can temporarily resolve software-level faults or crash data storage issues, it does not address hardware problems especially those caused by liquid damage.
Flash resets are only effective when:
- The airbag module is structurally intact
- There’s no visible corrosion or water damage
- The issue is software-related (such as stored crash data or minor voltage irregularities)
Option 2: Disassembly and Inspection
If the module shows persistent fault codes or malfunctions even after a reset, disassembly may be necessary. Upon opening the module, look for signs such as:
- Rust or corrosion on the internal PCB (printed circuit board)
- Burnt traces or damaged microchips
- Moisture residue or unusual discoloration
If these symptoms are present, the module is likely compromised beyond repair and should be replaced.
⚠️ Important Note: Any work on an airbag module should be performed with battery power disconnected and proper anti-static measures in place. Mishandling can result in accidental airbag deployment or injury.
What Should Vehicle Owners Do?
If you own a Ram ProMaster, especially models between 2014 and 2021, and haven’t experienced this issue yet, consider the following preventive actions:
- Use spill-proof containers in your vehicle
- Install a rubber liner or tray under the cup holders to divert liquid
- Avoid overfilling drinks in the cabin area
- Have your SRS system scanned regularly for hidden faults
For those already affected, the best course of action is:
- Run a full diagnostic scan for airbag-related DTCs
- Attempt a flash reset using a reliable OBD-II tool
- If errors persist, remove and inspect the airbag module for signs of fluid damage
- Replace the module with an updated OEM part, which features better protection
The Bigger Picture: Why This Matters
Airbags are a crucial component of vehicle safety systems, and any compromise in their functionality can have life-threatening consequences. While it’s disappointing that no recall has been issued for this known flaw, raising awareness can help both vehicle owners and technicians make informed decisions.
At the same time, this issue highlights why proper diagnostic procedures and preventive maintenance are more important than ever. For shops, knowing where to look can save hours of troubleshooting. For drivers, understanding the risks helps prevent costly repairs and ensures your vehicle remains safe on the road.
