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P026A

Charge Air Cooler Efficiency Below Threshold

Charge air cooler efficiency dropped below diagnostic threshold — intake air not cooled enough after compression. Risk of knock and loss of power.

  • Check engine light: Yes
  • Emissions related: Yes
  • Repair difficulty: medium

Common causes

Ordered by how often each turns out to be the cause.

  • Intercooler airflow blocked or core damagedCommon

Parts involved

  • Intercooler
  • Cac Coolant Pump

P026A is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.