View source for P026A/000618

== P026A/000618 - Charge Air Cooler: Efficiency Below Threshold - MIL ON  ==

==== Possible Symptoms ====

* Malfunction Indicator Lamp (MIL) active
* Reduced engine output

==== Possible Causes ====

* Intercooler restricted (internal or external)
* Faulty sensor
* ECM firmware issue

==== Special Notes ====

* On some TDI CR engines, a faulty G42 / G31 sensor at the top of the intercooler may report a much higher than possible temperature:
** IDE04938 - Sensor for temp after charge air cooler: raw value
** [https://forums.ross-tech.com/index.php?threads/32948/ Case Study - P026A/000618 - Charge Air Cooler: Efficiency Below Threshold - MIL ON]

* When found in a Touareg with the 3.0L TDI CNRB engine, there may be a firmware update for this:
** https://static.nhtsa.gov/odi/tsbs/2013/SB-10067148-5290.pdf

[[Category:Fault Codes]]