Powertrain, generic (extended)

P2AFA Starter Relay D Stuck On

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

P2AFA describes starter relay D staying engaged although the control module has commanded it to release; the module infers this from a feedback signal, a voltage or current that should have changed. No manufacturer documents P2AFA publicly. The closest published case is relay C at Stellantis, where Starter Relay 3 Stuck On (P2AF5) is detected from the voltage gap between main and auxiliary battery. A relay welded closed in a cranking path can keep the starter spinning after the engine fires, which risks damage to starter and ring gear, whereas a stuck battery isolation relay mainly blocks stop-start and the charging of the second battery. Causes are welded contacts, a live control wire (see P2AF9) or a faulty driver. The opposite stuck fault is P2AFB.

Likely causes

Welded relay contacts
Control wire receiving voltage from another circuit
Output driver not switching off

Symptoms

  • Starter keeps turning or grinding after the engine starts
  • Stop-start disabled
  • Battery drain while parked

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–600
Time0.3–2.5 h

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

Parts involved

starter relay dwiring harnessecm

Related codes

P2AFBP2AF5P2AF9P26F0P26F2

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