P2AF6

Code

Generic P — Powertrain

Starter Relay C Stuck Off

Brand: Generic

Type: P — Powertrain

Views: UK: 25 EN: 101 RU: 29

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Faulty/stuck open starter relay C
Blown fuse or missing power feed to the relay coil/contacts
Open or shorted wiring in the relay control or supply circuit
Poor or corroded connector or ground at the relay or starter
Faulty control module (ECM/PCM/BCM) driver circuit
Intermittent immobilizer/anti-theft or broad network command preventing relay activation

Verify battery voltage (>=12.2 V resting) and battery terminal connections are clean and tight
Check fuses for starter relay feed and relay control circuit
Visually inspect starter relay C, socket, and wiring for corrosion, damage, loose pins
Scan for additional DTCs (immobilizer, BCM, starter circuit codes) and read freeze frame data
Listen for relay click when attempting to start; check for starter solenoid activity

Battery supply to relay contact: ~12 V (key ON/START)
Relay coil supply: 12 V on one coil terminal when powered (or ground switching depending on design)
Control module output: command signal (ground or +12V) to relay coil during cranking command
Starter solenoid input: voltage present at starter solenoid terminal when relay energizes
Cranking current draw: measured at starter motor when engaged (high current when cranking)

Retrieve codes and freeze-frame data; note ignition switch position and battery voltage at fault time.
Verify basic conditions: fully charged battery, good engine grounds, battery terminals tight.
Inspect fuse(s) and fusible links for starter feed and replace if blown.
Locate Starter Relay C and inspect socket and wiring for corrosion, damage, or loose connectors.
Swap Starter Relay C with an identical known-good relay (if available) and re-test cranking to check relay failure.
Back-probe relay coil terminals while an assistant attempts to start: verify proper coil supply voltage and control signal (ground or +12V) when START is commanded.
If coil supply is present but no control signal, test the module driver output for correct switching and for shorts to power/ground. Repair or replace wiring as needed.
If control module output is present but relay still doesn’t close, check continuity and voltage at starter solenoid input; measure voltage under load to rule out wiring/high resistance.
Inspect and test ground connections for relay and starter; clean/tighten grounds and re-check operation.
If wiring and relay test good but control module output is faulty, consult manufacturer repair procedures before replacing the module; consider module replacement only after all wiring and external components are confirmed good.
After repairs, clear codes and perform several start cycles to confirm the fault does not return. Record results and road test as needed.