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2022 MERCEDES-BENZ S-CLASS
3.0L Turbo I6•AWD•AUTOMATIC•gas•M256•turbo
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Repairs0Labor490Torque1621Fluid7DTC1874Battery2Maintenance0Recalls0
P0232high severityPowertrain

Fuel Pump Secondary Circuit High

on 2022 Mercedes-Benz S-Class 3.0L Turbo I6 · AWD

What this code means

High voltage in the fuel pump secondary circuit.

Symptoms

  • Check Engine Light
  • Fuel pump running continuously

Common causes

  • Short to power
  • Relay stuck closed
  • Wiring issue

Diagnostic steps

  1. Test voltage
  2. Check relay
  3. Inspect wiring

Repair notes

Repair short or replace relay.

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