P0299 on Jeep — Markedly poor performance with intermittent failures to start and the engine warning light on
Code P0299 indicates that the boost pressure produced by the turbocharger stays below the value expected by the control unit. On the Jeep Cherokee KL 2.0 Multijet the recurring cause is a blocked oil feed pipe, which leaves the turbocharger without sufficient lubrication.
- System
- Fuel injection
- Component
- Turbocharger oil feed pipe
- Fault
- The vehicle shows markedly poor performance; the engine warning light then comes on and, on a cold start, it runs roughly until it cuts out.
- Typical symptoms
-
- Significantly reduced performance
- Engine warning light on
- Rough running after a cold start, until the engine cuts out
- Intermittent failures to start: the engine cranks but will not fire
- Vehicles affected
-
- Jeep Cherokee KL 2.0 Multijet 16v
- Main code
-
- P0299 Turbocharger boost pressure, insufficient value
- Related codes
-
- P0402 Exhaust gas recirculation, high reading
On this fault the diagnostic tool often returns several codes together.
- Solution
-
See the repair procedure verified on Sema Repair.
The cause and the repair are on Sema Repair
On Sema Repair this code is linked to verified case studies, with the confirmed cause case by case, the job step by step, indicative times, the manufacturer's notes and a photograph of the component with the point of intervention highlighted.
Frequently asked questions about P0299
Does the same P0299 have the same cause on another vehicle?
No, and this is the most expensive mistake with this code. P0299 only says that boost pressure is not reaching the expected value; what is preventing it depends on the engine.
Is it worth replacing the turbocharger straight away?
Replacing it without removing the underlying cause means ruining it again before long. On the Jeep Cherokee KL 2.0 Multijet, first check that oil is reaching the turbocharger in the expected quantity.
Can the vehicle be driven with P0299 active?
The vehicle moves, but with heavily reduced performance and occasional failures to start. Continuing to use it makes the damage worse.