P0232 — Fuel Pump Secondary Circuit High

P0232: Fuel Pump Secondary Circuit High — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Fuel Pump Secondary Circuit High. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • Check-engine warning; start failure, stumbling or intermittent pump operation are possible.
  • The secondary fuel-pump circuit has an unexpectedly high electrical input, not necessarily high hydraulic fuel pressure.

Possible causes

  • Relay contacts stuck or a wire shorted to supply voltage.
  • Pump-control module or harness fault; pump operation itself must be tested separately.

What to check

  • Confirm P0232 and identify the secondary pump-monitor circuit in the vehicle schematic.
  • Compare commanded pump/relay state with measured circuit voltage under OEM conditions.
  • Inspect relay, fuse, wiring and ground for unwanted back-feed or short to supply.
  • Check pump functionality and delivery only when the electrical fault is characterized.
  • Repair verified relay/wiring/module issue and retest both circuit state and fuel delivery.

Also written as: P0232-00, P023200, PO232 (some scan tools add the fault-type byte, e.g. -00).