P0299 on Jeep: How to Diagnose & Fix
Turbo/Supercharger Underboost Condition
2 Jeep models · 2 documented issues · 2 critical · $500-$3,000 repair
P0299 on Jeep by model: symptoms, diagnosis and fix
Certain 2014-2019 Jeep Grand Cherokee vehicles with the 3.0L EcoDiesel engine are included in safety recall W79 / NHTSA 20V-699. NHTSA lists 28,884 potentially involved Jeep vehicles. Thermal fatigue can cause the EGR cooler to crack internally over time, allowing pre-heated vaporized coolant into the EGR system; under some conditions the mixture can combust inside the intake manifold and lead to a vehicle fire. Recall inclusion is VIN-specific. The prior card overstated the Jeep population as 34,334, attached unsupported generic EGR codes, and offered OEM, aftermarket, manifold, and gasket purchases even though the recall repair is free and inspection-dependent.
Common Symptoms
- Coolant level is consistently low
- Malfunction indicator lamp may be illuminated
- Evidence of intake-manifold damage when the FCA inspection criteria are met
How to Fix
Check the VIN for open recall W79 and schedule the free repair with an authorized Jeep dealer. FCA's procedure replaces the EGR cooler using campaign parts. If the malfunction indicator lamp is illuminated, the dealer checks for P0299 and P2D2F; when either is present, the intake manifold is inspected and leak-tested and is replaced only if perforation is confirmed. Monitor the coolant level as FCA advises and contact the dealer if it is consistently low. If there is smoke, a burning smell, visible fire, or rapid coolant loss, stop safely, shut the engine off, move occupants away, and seek emergency/towing assistance. Do not buy an EGR cooler, manifold, aftermarket cooler, or gasket bundle in place of the VIN-specific recall remedy.
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Owner tips & cautions
- WarningDo not substitute an aftermarket EGR cooler for an open safety recall. Confirm W79 by VIN and use the free dealer remedy.
- TipThe intake manifold is not an automatic add-on. FCA calls for inspection and leak testing when P0299 or P2D2F is present, with replacement only if perforation is found.
- WarningThe corrected Jeep population is 28,884 potentially involved vehicles; 34,334 was not the Jeep-only total in NHTSA's report.
Sources for this issue (3)
The KJ-only 2.8L VM Motori CRD diesel (2005-2006 North America) uses an EGR valve that also acts as a pressure relief path for the turbocharger under certain conditions. When the valve carbons up and sticks - the standard outcome given the oily EGR fume load in the intake - boost pressure is no longer relieved and can spike hard enough to damage the turbo. Owners document the whole chain: heavy soot in the intake, rotted intake hose at the turbo from oily fumes, stalling, hesitation, smoke, long turbo lag (one owner measured roughly 2 seconds of lag that dropped to about half a second after EGR replacement), and eventually turbo failure with P0299 underboost. Chrysler changed EGR suppliers near the end of the 2005 production run and fitted the newer-style valve to earlier CRDs under warranty; all 2006 units received the later valve. This is a diesel-only failure and does not apply to the 3.7L V6.
Common Symptoms
- Loss of power and heavy black or grey smoke
- Intermittent stalling
- Long turbo lag before boost arrives
- Check engine light with underboost code
- Heavy soot in intake manifold and hoses
- Oil-rotted intake hose near the turbo
How to Fix
Confirm which EGR valve generation is fitted - a late-2005/2006 style valve is the baseline fix and early cars should be updated to it. Replace the EGR valve, clean or replace the intake manifold and hoses (soot deposits are typically severe), and inspect the intake hose at the turbo for oil rot. If P0299 or an audible turbo change is present, inspect the turbocharger and its variable-geometry actuator before assuming the EGR alone is the fault; a spiked turbo will not be saved by a new valve. The warranty coverage is long expired, so this is now an owner-cost repair. Owners in non-emissions jurisdictions commonly block or delete the EGR - legal only where emissions rules permit it.
Sources for this issue (4)
P0299 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0299 mean on a Jeep?
P0299 stands for "Turbo/Supercharger Underboost Condition." P0299 means the engine computer detected an underboost condition — the turbocharger or supercharger is producing less boost pressure than the PCM expects for the given conditions. The computer compares the manifold/boost pressure sensor reading to a target based on engine load, and when actual boost falls short, it sets this code. The most common real-world cause is a leak somewhere in the intake/charge-air path. You'll typically feel reduced power or sluggish acceleration, and the engine may go into a reduced-power mode. On Jeep it is documented across 2 models: Grand Cherokee, Liberty.
What are the most common causes of P0299?
The most common causes of P0299 are: Boost/intake leak (cracked or loose charge-air hose or intercooler), Faulty or sticking turbo wastegate or actuator, Stuck or clogged variable-geometry turbo vanes (VGT), Faulty boost pressure or MAP sensor, Leaking or disconnected vacuum/boost control lines, Restricted air intake or clogged air filter, Failed boost control solenoid, Worn or failing turbocharger. The specific cause varies by vehicle.
How much does it cost to fix P0299 on a Jeep?
Published repair estimates on Jeep range from $500 to $3,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0299 on a different make?
View P0299 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.