Check Input Voltage STP1

Incorrect or unstable input voltage detected at the STP1 module.

Possible causes

Loose or corroded battery connections
Alternator with defective diode
Power relay failing
Excessive voltage drop in harness

Recommended actions

Verify and tighten battery terminals
Measure voltage under load at STP1 module
Check status of control power relays
Clean ground points of the control unit

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