Turbo 2.5 CRDi

2.5 CRDi: two distinct engine codes, D4CB and E4CB, each pointing to a different manufacturer reference

On the 2.5 CRDi Hyundai-Kia, it is the engine code stamped on the block that determines which turbo to order. This guide identifies two codes: D4CB and E4CB. The first covers several power outputs — 2.5 CRDi, 2.5 CRDi 140 and 2.5 CRDi 170 — but this does not mean these three variants share the same turbo reference: the manufacturer references listed in this guide differ from one power output to another, even under the same D4CB code. The E4CB code, on the other hand, is specific to the 2.5 CRDi VGT version and is not associated with any other power output in this range.

Vehicles covered and identification pitfalls

The representative vehicles for this page are the Kia Sorento, the Hyundai Grand Starex and the Hyundai H100. The same model can be fitted with different power outputs, and therefore different turbos. Before placing any order, checking the engine code alone is not enough: you must also identify the exact power output (140, 170 or VGT) to confirm the correct manufacturer reference. Each power output in this guide has its own set of equivalent references, and references that appear similar are not interchangeable.

Causes of failure and symptoms to watch for

On this type of diesel block, the most common causes of failure are insufficient lubrication — degraded oil or excessively long intervals between oil changes — and the gradual fouling of the CHRA bearings. A blocked diesel particulate filter or a clogged EGR circuit can make matters worse by increasing back pressure. The typical symptoms are an abnormal whistling noise under acceleration, grey or bluish exhaust smoke, and a noticeable loss of power. It is essential to identify and address the root cause before fitting a new turbo: fitting a replacement part without having resolved the original problem will invariably lead to a repeat failure. All turbos listed here are brand new and sold as standard (non-exchange) parts.