RAM P0420 Error Code: How to Fix It

Q: Can I drive my RAM with a P0420 code?

Yes, you can drive short distances, but the vehicle will fail emissions tests and may have reduced fuel economy. Don't ignore this code as continued driving with a failing catalytic converter can cause additional engine damage.

Q: How much does it cost to fix P0420 on a RAM truck?

Repair costs vary widely depending on the root cause. Oxygen sensor replacement costs $200-400, while catalytic converter replacement can cost $800-2000. Start with less expensive diagnostics before replacing the converter.

Q: Will a P0420 code clear itself?

No, the P0420 code will not clear itself. The underlying problem must be fixed, and then the code must be manually cleared with an OBD2 scanner. The PCM needs to complete a full drive cycle to verify the repair.

Q: What causes catalytic converter failure in RAM trucks?

Common causes include faulty oxygen sensors, engine misfires, oil consumption, coolant leaks into combustion chambers, rich or lean fuel mixtures, and normal wear after 100,000+ miles.

Q: How long do RAM catalytic converters last?

RAM catalytic converters typically last 80,000-120,000 miles under normal driving conditions. Severe driving conditions, engine problems, or poor maintenance can reduce this lifespan significantly.

Abstract

The P0420 error code in your RAM vehicle indicates that the catalytic converter's efficiency has dropped below the threshold for Bank 1. This means your truck's emissions system isn't working properly, which can affect performance and cause you to fail emissions tests.