P2AF5: Starter Relay C Stuck On

P2AF5 means starter relay C remains in its energised state when it should have dropped out. Stellantis uses it as Starter Relay 3 Stuck On for the power control relay of its dual-battery stop-start system: Jeep Grand Cherokee 2021 to 2025, Wagoneer and Grand Wagoneer 2022 to 2025, RAM 1500 2025, and earlier Pacifica, Durango, Compass, Wrangler and Gladiator. In normal driving the relay is released and closed, so the main battery also charges the auxiliary one; if the PCM still sees a voltage gap between the two above a calibrated limit, it stores P2AF5 and disables stop-start. Owners report no cranking, no start or a dead auto-stop function. Stellantis checks battery terminals, the 150 A fuses and distribution centre connections, and notes false fails with a flat auxiliary battery that a battery disconnect clears.

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

No crank or no start
Stop-start inoperative, service message for the system
Auxiliary battery not being charged

Most likely causes

Loose or corroded B+ connection at main or auxiliary battery
Depleted auxiliary battery causing a false fail
Open or poorly seated 150 A fuse or fuse array
Power control relay mechanically stuck

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: easy

What each character of P2AF5 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
A: Hybrid or air and fuel
F5: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2AF5?

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 P2AF5?

The most common causes are: loose or corroded B+ connection at main or auxiliary battery; depleted auxiliary battery causing a false fail; open or poorly seated 150 A fuse or fuse array.

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.