Cause
Split or disconnected intercooler hose
A charge pipe between the turbocharger, the intercooler and the engine split or blown off, so pressurised air escapes before reaching the cylinders. It is the single commonest cause of a sudden, dramatic boost loss, and it is usually audible — a distinct whoosh under acceleration.
Hoses come off rather than failing, which is the useful distinction. Boost pressure acts to push a hose off its stub, so a clamp that was not retorqued after work, or a stub with an oily film on it, releases under load and often reseats afterwards. A fault that appears only at full throttle and cannot be reproduced on a ramp is this, and it will pass every static inspection.
Pressure-test the charge system cold. That finds a split on the underside of a bend and a joint that will not hold, neither of which is visible. Oil in the pipework is worth noting while you are there — it softens the rubber and lubricates the joint, so it both causes the release and points at turbocharger seal wear upstream.
Typically an easy fix. Often worth checking before paying anyone to look.
Some of these codes mean you should stop driving
2 of the 3 codes this can cause indicate a fault where continuing to drive risks damage or is unsafe. Which one you have matters more than the cause does — read the code's own page before deciding.
Codes this can cause (3)
Codes where this is a likely explanation first, rather than merely a possible one.
- P2262 Turbocharger/Supercharger Boost Pressure A Not Detected — Mechanical Likely for this code High
- P2579 Turbocharger/Supercharger Speed Sensor A Circuit Range/Performance Likely for this code Stop driving High
- P2594 Turbocharger Speed Sensor B Circuit Range/Performance Likely for this code Stop driving High
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Others who found this
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about Split or disconnected intercooler hose.