P2AFA: Starter Relay D Stuck On

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.

Medium severity. Can I keep driving?If it starts normally you can keep driving, but avoid stopping anywhere you could not get help, because it might not restart.

Symptoms

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

Most likely causes

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

What to check, in order

Start with the simplest. You can tick off each step.

Check the battery voltage
Use the scanner to command the movement and compare the actual position with the requested one.
Try another key, if you have one
Check the fuses and the starter relay
Check the wiring and the signal to the starter motor

Good to know

Repair difficulty: medium

What each character of P2AFA means

P: Powertrain: engine and transmission
2: Generic code: same on every make
A: Hybrid or air and fuel
FA: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2AFA?

If it starts normally you can keep driving, but avoid stopping anywhere you could not get help, because it might not restart.

What causes code P2AFA?

The most common causes are: welded relay contacts; control wire receiving voltage from another circuit; output driver not switching off.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.