Powertrain, generic (extended)

P2D8C Fan 2 Control Module Supply Voltage Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2D8C concerns the supply circuit of the fan 2 control module. The engine controller registers that the module does not get proper operating voltage, whether through an open or high-resistance feed, a blown fuse, a poor ground or a reported voltage outside its window. Porsche lists P2D8C in the DME of the 718 GTS 4.0, GT4 and Spyder from model years 2021 to 2023 as radiator fan 2 (right), power supply. Bulletin 198/22 traces the joint appearance with P2D89 to a software error during control unit start-up and fixes it with a DME update; the fan then failed now and then, the air conditioning lost performance and an engine control warning could appear. Before condemning a fan, measure the voltage drop at the module under load. Fan 1 has P2D89, internal faults of the module are P2D8B.

Likely causes

Blown fuse or high-resistance supply line to the fan 2 module
Engine control software error at start-up (Porsche 198/22)
Loose or corroded ground connection

Symptoms

  • Second radiator fan fails now and then
  • Air conditioning loses cooling power
  • Engine control warning displayed

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–400
Time0.5–2 h

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

Parts involved

fan control module 2wiring harnessecm

Related codes

P2D89P2D8AP2D8BP0485P0481

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