- Vehicles
- Cars
P0455
Jeep P0455: large EVAP leak detected
Evidence linked to this decision
View source: FCA TSB 25-002-15 Rev A Jeep Grand Cherokee P0455Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
Jeep detected that the evaporative-emissions system could not hold the expected seal; the leak location is still unknown. Fuel smell is a safety stop; otherwise exact build date and a professional leak test must locate the loss before a hose or valve is bought.
Safety first
Stop and check this first
- Do not reproduce a fault on the road. Stop driving for a flashing engine light, severe power loss, smoke, fuel smell, overheating, abnormal mechanical noise, no-start or reduced steering assist.
Safe checks you can perform
- Preserve the evidence before any reset
- Use the observation that changes the path
- Test the official bulletin boundary
Leave these tasks to a qualified professional
- Do not attempt this professional task: Request a measurement-led diagnosis
- Do not attempt this professional task: scoped split purge-valve hose
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Request a measurement-led diagnosis
What they doRun the FCA vehicle/system check and approved EVAP leak diagnosis; use the bulletin hose repair only after VIN/build match.
scoped split purge-valve hose
What they doAsk for the leak-test location, build-date match and handling of every companion DTC.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Preserve the evidence before any reset
Save P0455, every accompanying DTC, freeze-frame values, readiness state and the module that reported it. Record the VIN, model year, engine, market and symptoms. Do not clear codes or disconnect the battery yet.
Do not reproduce a fault on the road. Stop driving for a flashing engine light, severe power loss, smoke, fuel smell, overheating, abnormal mechanical noise, no-start or reduced steering assist.
Evidence: FCA TSB 25-002-15 Rev A Jeep Grand Cherokee P0455
Use the observation that changes the path
Fuel smell, P0456/other DTCs and the exact Grand Cherokee build date are recorded without opening the EVAP system
Do not reproduce a fault on the road. Stop driving for a flashing engine light, severe power loss, smoke, fuel smell, overheating, abnormal mechanical noise, no-start or reduced steering assist.
Evidence: FCA TSB 25-002-15 Rev A Jeep Grand Cherokee P0455
Test the official bulletin boundary
2015 Jeep Grand Cherokee built from 16 Nov 2014 through 17 Jan 2015 in the markets listed by FCA TSB 25-002-15A
A matching code is not enough: every model, engine, market and build condition must match.
Evidence: FCA TSB 25-002-15 Rev A Jeep Grand Cherokee P0455
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Virtual technician
Does P0455 still appear after these checks?
This guided flow uses the exact code and your answers to choose a test, an expected result and the next branch.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Vehicles
- Brand
- Jeep
- Product type
- Cars
Known code variants
- Jeep P0455
- P0455
- P0455 code Jeep
- P0455 EVAP large leak
- P0455 fuga grande EVAP
- P0455 Jeep
- P0455 OBD2
What it means
FCA documents a split hose that prevents sealing only in the short 2015 Grand Cherokee production window. Outside that scope, or when other DTCs/symptoms exist, current wiTECH/TechCONNECT diagnosis must locate the actual leak before replacement. 2015 Jeep Grand Cherokee built from 16 Nov 2014 through 17 Jan 2015 in the markets listed by FCA TSB 25-002-15A
Warnings and stop conditions
- Highsource verified
Do not reproduce a fault on the road. Stop driving for a flashing engine light, severe power loss, smoke, fuel smell, overheating, abnormal mechanical noise, no-start or reduced steering assist.
Evidence: FCA TSB 25-002-15 Rev A Jeep Grand Cherokee P0455
Symptoms and causes
Probable causes · in order
- scoped split purge-valve hosePossible
FCA documents a split hose that prevents sealing only in the short 2015 Grand Cherokee production window.
Evidence: FCA TSB 25-002-15 Rev A Jeep Grand Cherokee P0455
- another EVAP sealing pathPossible
Outside that scope, or when other DTCs/symptoms exist, current wiTECH/TechCONNECT diagnosis must locate the actual leak before replacement.
Evidence: FCA TSB 25-002-15 Rev A Jeep Grand Cherokee P0455
Sources and technical references
- 1
FCA TSB 25-002-15 Rev A Jeep Grand Cherokee P0455
FCA US LLC · 2015 · service_bulletin
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