Powertrain, generic (extended)

P2AFB Starter Relay D Stuck Off

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

P2AFB is set when starter relay D ignores an on command: the module energises it, but the expected change of voltage or current in the switched circuit never appears. No manufacturer documents P2AFB publicly. Stellantis shows on relay C how such a check works. Its Starter Relay 3 Stuck Off (P2AF6) is stored when both battery voltages stay equal during an auto-start although the relay should have separated them, and the published remedies range from a loose connector at the power distribution centre to new PCM software. For relay D, burnt or corroded contacts, a weak coil, low supply voltage and a poor ground are the usual suspects. Drivers may see a no-crank or an auto-stop that stays unavailable. The stuck-on counterpart is P2AFA; circuit faults are P2AF7 to P2AF9.

Likely causes

Burnt or corroded relay contacts
Low supply voltage or poor ground at the relay
Loose connector at the relay or distribution box

Symptoms

  • Engine does not crank on the affected path
  • Auto-stop permanently unavailable
  • Stored code, lamp depending on manufacturer

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–400
Time0.3–2 h

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

Parts involved

starter relay dwiring harnessecm

Related codes

P2AFAP2AF6P2AF7P26F1P26F3

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