Diagnostic trouble code · Jeep
P0456 on Jeep vehicles A very small leak in the evaporative emissions system
P0456 is named on 20 Jeep model years (2016–2023): 125 manufacturer filings and 4 owner reports in NHTSA’s files, across Wrangler, Cherokee, Gladiator Pickup, Renegade, Grand Cherokee and 2 more.
Powertrain 20 model years 125 manufacturer filings 4 owner reports
Which Jeep model years name P0456
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2019 Jeep Wrangler | Power Train | 22 | — |
| 2019 Jeep Cherokee | Power Train | 20 | — |
| 2020 Jeep Gladiator Pickup | Power Train | 16 | — |
| 2018 Jeep Wrangler | Power Train | 16 | — |
| 2019 Jeep Renegade | Exterior Lighting | 9 | — |
| 2020 Jeep Wrangler | Electrical System | 6 | — |
| 2018 Jeep Grand Cherokee | Power Train | 5 | 1 |
| 2021 Jeep Wrangler | Fuel/Propulsion System | 5 | — |
| 2019 Jeep Compass | Electrical System | 5 | — |
| 2019 Jeep Grand Cherokee | Electrical System | 5 | — |
| 2018 Jeep Renegade | Electrical System | 4 | — |
| 2021 Jeep Gladiator | Fuel/Propulsion System | 3 | — |
| 2016 Jeep Compass | Power Train | 3 | — |
| 2023 Jeep Grand Cherokee | Fuel/Propulsion System | 2 | — |
| 2017 Jeep Grand Cherokee | Engine | — | 2 |
| 2020 Jeep Grand Cherokee | Electrical System | 1 | — |
| 2017 Jeep Renegade | Engine | — | 1 |
| 2017 Jeep Wrangler | Structure | 1 | — |
| 2016 Jeep Cherokee | Engine | 1 | — |
| 2016 Jeep Wrangler | Fuel/Propulsion System | 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.
Power Train 45 Electrical System 32 Fuel/Propulsion System 14 Engine 8
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What Jeep owners said
Source: NHTSA complaint databaseOwners’ own words, scrubbed of anything identifying. Unverified reports filed with NHTSA — what was said, not a finding that it was true.
On May 27, only five days and approximately 96 miles after purchase, a diagnostic showed Check Engine FAIL with codes P0128 and P0456
Jeep filings that name P0456
Source: NHTSA manufacturer communicationsBulletins and campaigns Jeep filed with NHTSA whose summary names P0456. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- 18-012-19 REV A Service bulletin2019-05-29 · Power Train
- Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following DTCs have been set:P0456 - EVAP System Small Leak. P0128 - Thermostat Rationality. The following software enhanc
- 18-037-19 REV. A Service bulletin2019-08-14 · Power Train
- Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. The customer may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following DTCs: P050B - Cold Start Ignition Timing Performance. P0456 - EVAP System Small Leak. P0128 - Thermostat Rational
- 18-012-19 REV. C Service bulletin2019-08-14 · Power Train
- Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following DTCs have been set:P050B - Cold Start Ignition Timing Performance. P0456 - EVAP System Small Leak. P0128 - Ther
- 18-024-19 REV. A Service bulletin2019-10-01 · Power Train — Automatic Transmission
- Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that the one ormore of the following Diagnostic Trouble Codes (DTCs) have been set:P0456 - EVAP System Small Leak. P06EF - Engine Restart Perform
- 18-024-19 REV. B Service bulletin2019-10-16 · Power Train — Automatic Transmission — Control Module (Tcm/Pcm/Tecm)
- Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that the one or more of the following Diagnostic Trouble Codes (DTCs) have been set: P06EF - Engine Restart Performance. P0456 - EVAP System Small
- 18-024-19 REV. C Service bulletin2019-11-01 · Electrical System
- Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that the one or more of the following Diagnostic Trouble Codes (DTCs) have been set:P06EF - Engine Restart Performance. P0456 - EVAP System Small
- 18-055-19 REV. A Service bulletin2019-11-19 · Power Train
- Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more ofthe following DTCs. P0456 - EVAP System Small Leak. If DTC P0456 is present use the wiTECH Small Leak Verification test (SLVT)to d
- 1805519 Service bulletin2019-11-19 · Power Train
- Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more ofthe following DTCs. P0456 - EVAP System Small Leak. If DTC P0456 is present use the wiTECH Small Leak Verification test (SLVT)to d
- S2025000004 Service bulletin2020-04-28 · Electrical System
- Customer complains of the MIL lamp on. Technician observes DTC P0456 EVAP System Small Leak or P0455 EVAP System Large Leak detected set in PCM.
- 18-041-19 Service bulletin2019-05-04 · Power Train — Automatic Transmission — Control Module (Tcm/Pcm/Tecm)
- Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Powertrain Control Module (PCM) with thelatest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or moreof the following DTCs have been set: P0456 - EVAP System Small Leak(APAC&EMEA with Sales Codes NA1 wit
- 18-092-19 Service bulletin2019-11-06 · Electrical System
- Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technicianmay find one or more of the following Diagnostic Trouble Codes (DTCs):P06EF - Engine Restart Performance. P0456 - EVAP System Small Leak.
- 1809219 Service bulletin2019-11-06 · Power Train
- Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the PCM with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technicianmay find one or more of the following Diagnostic Trouble Codes (DTCs):P06EF - Engine Restart Performance. P0456 - EVAP System Small Leak.
What P0456 means
Source: SAE J2012 / OBD-IIA very small leak in the evaporative emissions system.
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
Common questions
Source: NHTSA files and the OBD-II standardIs P0456 a known problem on Jeep vehicles?
It is a documented one: NHTSA's files hold 125 manufacturer filings and 4 owner reports naming P0456 on 20 Jeep model years (2016–2023). 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 P0456 appear on most?
2019 Wrangler (22 documents), 2019 Cherokee (20 documents), 2020 Gladiator Pickup (16 documents).
Does P0456 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.