P0420 on CHRYSLER PACIFICA — Catalyst System Efficiency Below Threshold Bank 1

Q: "What does P0420 mean on a CHRYSLER PACIFICA?"

"P0420 indicates: Catalyst System Efficiency Below Threshold Bank 1. This is a emission controls code. 3 CHRYSLER PACIFICA owners have reported this to NHTSA."

Q: "What are the most common causes of P0420 on CHRYSLER PACIFICA?"

"Based on 3 NHTSA reports, the most commonly cited components are: Suspension,Unknown Or Other,Engine, Electrical System,Engine,Forward Collision Avoidance, Engine. These percentages are based on the component field in owner complaints."

Q: "Is P0420 serious on my CHRYSLER PACIFICA?"

"Of 3 NHTSA reports for this code on CHRYSLER PACIFICA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my CHRYSLER PACIFICA shows P0420?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What P0420 Means on Your CHRYSLER PACIFICA

P0420 is a diagnostic trouble code indicating: Catalyst System Efficiency Below Threshold Bank 1. This code relates to the emission controls system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

3 CHRYSLER PACIFICA owners have reported this issue to NHTSA across model years 2006-2017. Most reports come from the 2017, 2006 model years.

Real CHRYSLER PACIFICA Owner Reports

Source: NHTSA Complaints Database

"We have a 2006 chrysler pacifica that we purchased used in 2008 with 26k miles. in 2011 we started experience problems. simultaneously, we came up with codes p0700, p0420 and p0456 and have had to have the transmission rebuilt , the catalyst converter replaced and new fuel pump due to the evap leak."

— 2006 CHRYSLER PACIFICA owner · SUSPENSION,UNKNOWN OR OTHER,ENGINE · Filed 07/06/2013

"Intermittently my van will lose power, all dash lights will pop up, active parksense unavailable, service required , blind spot alert temporarily unavailable , service shifter, fcw unavailable service required, service electronic stability control will pop up on the dash and in the message center."

— 2017 CHRYSLER PACIFICA owner · ELECTRICAL SYSTEM,ENGINE,FORWARD COLLISION AVOIDANCE · Filed 06/01/2024

"We have 2017 Chrysler pacifica there's 96miles on it that my drives to work, after she came back from work this morning I took the car key so i can go to the car wash when started the car i notice the was shaking and there was a check engine light, so i scan the car there was three code on the car."

— 2017 CHRYSLER PACIFICA owner · ENGINE · Filed 08/20/2023

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

1

'06

2

'17

Common Causes on CHRYSLER PACIFICA

Based on NHTSA complaint component analysis for this vehicle.

SUSPENSION,UNKNOWN or OTHER,ENGINE 33.3%

ELECTRICAL SYSTEM,ENGINE,FORWARD COLLISION AVOIDANCE 33.3%

ENGINE 33.3%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P0420 mean on a CHRYSLER PACIFICA? ▾

P0420 indicates: Catalyst System Efficiency Below Threshold Bank 1. This is a emission controls code. 3 CHRYSLER PACIFICA owners have reported this to NHTSA.

What are the most common causes of P0420 on CHRYSLER PACIFICA? ▾

Based on 3 NHTSA reports, the most commonly cited components are: Suspension,Unknown Or Other,Engine, Electrical System,Engine,Forward Collision Avoidance, Engine. These percentages are based on the component field in owner complaints.

Is P0420 serious on my CHRYSLER PACIFICA? ▾

Of 3 NHTSA reports for this code on CHRYSLER PACIFICA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my CHRYSLER PACIFICA shows P0420? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.