Powertrain, generic (extended)

P2D8A Fan 2 Control Module Over Temperature

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

P2D8A is the second-fan twin of P2D87: the electronics that power fan 2 signal that they have reached their temperature limit. On cars with two radiator fans the second one usually sits on the other side of the shroud; Porsche, for instance, calls its right-hand fan number 2. No manufacturer publicly documents P2D8A. Since supplier modules such as those from Brose are specified for stable output only up to about 120 °C, heat soak in the engine bay after a hard run, a jammed motor pulling high current or clogged fins that starve the fan of air are the first suspects. CARB requires output devices to be checked for proper response, and a module that throttles itself no longer delivers the requested airflow. Expect higher coolant temperature in traffic and weaker air conditioning.

Likely causes

Stiff or partly blocked fan 2 motor overloading its electronics

Heat build-up around the module, e.g. clogged fins or damaged air guides

Defective temperature sensing or power stage in the fan 2 module

Symptoms

Second fan slows down or cuts out after long idling
Coolant temperature climbs at standstill
Air conditioning blows warmer

Repair estimate

DifficultyMediumDIY possible

Parts and labour€150–800

Time1–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fan control module 2wiring harnessecm

References: law.cornell.edu, brose.com, static.nhtsa.gov.