Powertrain, generic (extended)

P2EAC Active Radiator Air Flow Control Module A Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2EAC is the general performance fault of module A: the module can be reached, but the flap system does not do what it is told. GM's check of the comparable smart shutter actuator on the 3.0 L diesel LZ0 shows the approach: a gap of more than 5 % between commanded and reported position starts repeated attempts to free the flaps, and only after a calibrated number of failed retries is the fault confirmed, type B with the MIL after two trips. A Chrysler patent application, US20130338870, names ice as a frequent reason and has the system try again once the temperature is above 0 °C. No manufacturer documents P2EAC publicly; Hyundai and Kia's US11225900 shows the flap hardware involved. Usual causes are frozen or blocked flaps, a broken linkage and a worn actuator.

Likely causes

Flaps frozen or blocked by debris
Broken or detached flap linkage
Worn gearbox or motor in the actuator

Symptoms

  • Check engine lamp on, where the maker assigns a MIL
  • Flaps do not open or close, sometimes only in frost
  • Warmer engine under load or slower warm-up

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–700
Time0.3–2 h

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

Parts involved

active radiator airflow module aradiator air flaps

Related codes

P2EAAP2EABU02C0P059F

References: gsi.ext.gm.com, patents.google.com, patents.google.com.