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2020 Pacifica P0420 Code - Check Engine Light On

0

Heather Y. · rep 0 · May 22, 5:00 AM · 1 replies · solved · Question

Hey everyone,

My 2020 Chrysler Pacifica Touring L recently illuminated the Check Engine Light. I used my OBD-II scanner, and it's pulling a P0420 code: 'Catalyst System Efficiency Below Threshold (Bank 1)'.

The van seems to be driving perfectly fine, no noticeable loss of power, strange smells, or unusual noises. Fuel economy also appears normal. I'm a bit concerned about what this might mean, especially since I've heard catalytic converter replacements can be quite expensive.

What are the most common causes for a P0420 code on these Pacificas? Is there anything I can check myself before taking it to a shop? I'm hoping it's something simpler than a bad catalytic converter right off the bat.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:00 AM

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ClearTheCode guidance (Chrysler · Diagnostics & codes)

Summary: For 2020 Pacifica P0420 Code - Check Engine Light On, work through these steps on your 2016+ vehicle:

  1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
  2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
  3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
  4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
  5. Test the common fix — follow model-specific service procedures; one change at a time.
  6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: Hey everyone,

My 2020 Chrysler Pacifica Touring L recently illuminated the Check Engine Light. I used my OBD-II scanner, and it's pulling a P0420 code: 'Catalyst System Efficiency Below Threshold (Bank 1)'.

The van seems to be driving perfectly fine, no noticeable loss of power, strange smells, or unusual noises. Fuel economy also appears normal. I'm a bit concerned about what this might mean, e…

This is educational guidance, not a substitute for hands-on diagnosis.

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