Cooling

P026E — Charge Air Cooler Coolant Pump 'A' Performance Problem

Severity: medium Drive with care, to a shop

What P026E means

The engine control unit monitors the electric pump that circulates coolant through the liquid-to-air charge air cooler (intercooler). P026E sets when the pump's actual performance does not match what the ECU commands: it may not spin, spin weakly, or fail to move coolant through the loop. As a result, intake air stays hotter than intended.

Symptoms

  • Check Engine light on
  • Reduced power and sluggish acceleration
  • Elevated intake air temperature
  • Possible engine overheating or a hot intercooler loop
  • Low coolant level or visible coolant leaks

Possible causes

  1. Failed charge air cooler coolant pump
  2. Open circuit, high resistance or short in the pump power or control wiring
  3. Low coolant or air trapped in the cooler loop
  4. Blocked or kinked coolant lines or passages
  5. Faulty pump relay or blown fuse
  6. Corroded or loose connector terminals

How to diagnose

  1. Scan all codes and freeze frame data, and look for related boost or intake air temperature codes
  2. Check coolant level and condition in the intercooler loop and inspect hoses and the cooler for leaks
  3. Inspect the pump fuse and relay, and swap the relay with a known good one if needed
  4. Inspect the pump wiring and connector for damage, corrosion or heat marks
  5. Test for power and ground at the pump connector with a multimeter
  6. Command the pump on with a scan tool and confirm it runs and can be heard
  7. Check the loop for blockage and air pockets, and bleed the system
  8. Compare intake air and loop temperature readings against expected values

Common fixes

  • Replace the charge air cooler coolant pump
  • Repair the wiring harness or replace a damaged connector
  • Replace the pump relay or fuse
  • Top up coolant and bleed the loop
  • Replace clogged or damaged hoses and lines

Questions and answers

What does P026E mean?

It means the ECU judges the performance of charge air cooler coolant pump A to be incorrect. The cause can be the pump, its electrical circuit or low coolant.

Can I drive with code P026E?

Briefly and with care. The engine may lose power because of hot intake air, and extended driving under load raises the risk of damage.

How do I start diagnosing P026E?

Begin with the coolant level in the intercooler loop and the pump fuse and relay. Then inspect the connector and check for power and ground at the pump.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.