2020 Ram 2500 Exhaust Brake Not Working: Fix & Diagnosis

When your 2020 Ram 2500 exhaust brake not working becomes apparent, it's more than just an inconvenience; it's a significant concern for safety and vehicle longevity, especially if you regularly tow heavy loads or navigate steep grades. The exhaust brake system is crucial for controlling vehicle speed, reducing wear on your service brakes, and enhancing overall safety. If you've noticed a lack of deceleration when the system should be active, or if your truck seems to be relying entirely on its friction brakes, it's time to investigate this critical component of your Ram 2500's performance. Understanding the issue is the first step towards a solution for your specific Ram vehicle, particularly your 2500 model.

What Drivers Notice: Symptoms of a Malfunctioning Exhaust Brake

Drivers of the 2020 Ram 2500 typically notice the exhaust brake failure most acutely when descending hills or attempting to maintain a steady speed with a trailer. Instead of the familiar engine braking sensation that helps slow the truck, it may simply coast, requiring more frequent and heavier application of the foot brake. This can lead to increased brake fade, longer stopping distances, and premature wear of brake components. You might also notice:

• The exhaust brake switch is engaged, but no noticeable deceleration occurs.
• The truck feels like it's

At a glance: difficulty, repair cost, and diagnostic workflow

• Difficulty Rating: 6/10 — Moderate
• Common Symptoms: 2020 Ram 2500 Exhaust Brake Not Working
• Estimated Repair Cost: $150–$1,100 (parts + typical shop labor)
• OEM Tooling Required: Standard OBD-II scanner and hand tools

Diagnostic workflow:

1. Confirm the symptom on your vehicle.
2. Scan for stored or pending codes with an OBD-II tool.
3. Inspect the most common causes in this guide (visual checks first).
4. Run verification tests before replacing parts.
5. Repair, clear codes, and verify on a test drive.

Related pages

• All repair guides
• Browse vehicles
• Browse OBD-II codes
• Ram vehicle hub
• 2500 model hub

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This guide is not a substitute for OEM service procedures; use a qualified technician for safety-critical repairs.

Frequently asked questions

How urgent is this problem?

If symptoms are worsening or safety systems are affected, diagnose soon; minor issues can often wait for a scheduled service visit.

Can I drive with this issue?

Short trips may be acceptable for some faults, but stop driving if you notice overheating, loss of braking, steering problems, or strong fuel smells.

Do I need a dealer scan tool?

A basic OBD-II scanner helps confirm codes; some steps still need visual checks and meter tests described above.

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