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Home›Trouble codes›P0420› Jeep
Diagnostic trouble code · Jeep

P0420 on Jeep vehicles The catalytic converter on bank 1 is not cleaning up the exhaust as well as it should

P0420 is named on 5 Jeep model years (2016–2019): 4 manufacturer filings and 4 owner reports in NHTSA’s files, across Grand Cherokee, Renegade, Compass, Patriot.

Powertrain 5 model years 4 manufacturer filings 4 owner reports

Which Jeep model years name P0420

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2019 Jeep Grand CherokeeElectrical System2—
2018 Jeep Grand CherokeePower Train2—
2017 Jeep RenegadeEngine—2
2016 Jeep CompassEngine—1
2016 Jeep PatriotEngine—1

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Engine 4 Electrical System 2 Power Train 2
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Jeep filings that name P0420

Source: NHTSA manufacturer communications

Bulletins and campaigns Jeep filed with NHTSA whose summary names P0420. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

What P0420 means

Source: SAE J2012 / OBD-II

The catalytic converter on bank 1 is not cleaning up the exhaust as well as it should.

A stored code names the test that failed, never the part that caused it. The record above is what Jeep and its owners have filed about it; the code’s page across every make has the whole file.

From here
Get a model's new bulletins by email See what owners reported Look up a bulletin by its number Watch a VIN for new recalls

Common questions

Source: NHTSA files and the OBD-II standard

Is P0420 a known problem on Jeep vehicles?

It is a documented one: NHTSA's files hold 4 manufacturer filings and 4 owner reports naming P0420 on 5 Jeep model years (2016–2019). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.

Which Jeep models does P0420 appear on most?

2019 Grand Cherokee (2 documents), 2018 Grand Cherokee (2 documents), 2017 Renegade (2 documents).

Does P0420 on a Jeep mean it is recalled?

No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.

Where to go next

pages beside this code
Filed alongside P0430 Another code that appears in the same filings and owner reports as P0420.Filed alongside P0087 Another code that appears in the same filings and owner reports as P0420.Vehicle 2019 Jeep Grand Cherokee The model year P0420 is filed against most often.The data Trouble codes by API GET /v1/dtc joins every code to bulletins and owner reports — free tier, no card.