P026E: Charge Air Cooler Coolant Pump A Performance
What to do
Ask whether the charge air cooler's own coolant circuit has been bled properly, especially if any cooling system work has been done recently. Air trapped in this circuit is the commonest cause of this fault, these systems are awkward to bleed, and doing it properly is often the entire repair.
Ask for the separate coolant reservoir to be checked. This system does not share the engine's expansion tank and is easy to overlook at a service.
Expect the car to feel flat on long climbs or under heavy load while feeling normal around town — that is what hot charge air does.
Not urgent, but do not leave it indefinitely, since sustained high intake temperatures cost economy and are hard on the engine.
What this code means
The charge air cooler's coolant pump is running, but not moving coolant the way it should.
Performance is the distinction from the circuit codes in this family, and it changes what to check. A circuit code says the electrical connection is wrong. This one says the electrics are fine and the hydraulics are not — the pump is being commanded, it is drawing current, and the temperature drop it is supposed to produce is not appearing.
So the causes are about flow rather than about wiring.
- Air trapped in the low-temperature circuit, which is easily the commonest and is usually left behind by a repair. These circuits are awkward to bleed and an air lock stops a small pump moving anything at all.
- Coolant level low in the separate reservoir. This system does not share the engine's expansion tank, and it is routinely missed at service.
- A blocked cooler core or restricted hose, so the pump works against a restriction it cannot overcome.
- A worn pump whose impeller no longer moves what it used to, which is a genuine failure and the least common of the four.
Ask what was done to the cooling system recently. An air lock introduced during unrelated work is the classic route to this code, and bleeding the circuit properly is the whole repair.
The symptom is the family's — hot charge air, timing pulled back to protect the engine, and a car that feels flat under sustained load while behaving normally in ordinary driving.
Likely causes
Start here
Less common
- Blocked or failing intercooler · moderate
- Seized pump motor · moderate
- Blocked or kinked coolant hose · easy
Symptoms
Components involved
Information, not instruction
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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.
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