Network, generic

U0440 Invalid Data Received From Pedestrian Alert Control Module

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

U0440 points at the pedestrian alert control module, which drives the external speaker of electric and hybrid vehicles. FMVSS 141 in the US demands an audible signal while the vehicle stands with its propulsion active and at speeds below 30 km/h, so the module needs speed, gear and propulsion state and reports its own status back. A receiver sets U0440 when the module's frames arrive with invalid content. No manufacturer documents U0440 publicly; Ford names the part PACM, for instance in bulletin 21-2271 about a rattle from its connector in the 2020-21 Escape Hybrid. The likely result is a warning about the pedestrian alert system: the car stays drivable, but may be quieter than the rule allows at low speed. U013F is lost contact.

Likely causes

Loose or vibrating connector at the alert module

Alert module software not matched to the vehicle

Internal fault of the pedestrian alert module

Symptoms

Pedestrian alert system warning in the cluster
No external sound at low speed

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€40–500

Time0.3–1.5 h

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

Parts involved

pedestrian alert control module

Related codes

U013F

References: law.cornell.edu, static.nhtsa.gov, en.wikipedia.org.