Powertrain, generic · Fuel and air metering (injector circuit)

P0232 Fuel Pump Secondary Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

The fuel pump circuit has two sides: the primary circuit is the engine module's output to the fuel pump relay coil (or to a pump control module), the secondary circuit is the power circuit from relay contact or module to the pump itself. P0232 means there is voltage in the pump power circuit although the pump should be off – a welded relay contact or a power wire shorted to another supply. GM pump modules check this after switch-off or in the off phase of the PWM cycle; above about 4 V the code sets once per trip, with the warning light after two trips. Ford's relay systems see it through the pump monitor wire. Driving is usually unaffected, but the pump may keep running with the ignition off and drain the battery – and an emergency shutdown would not work.

Likely causes

Relay contact welded or sticking
Pump power wire shorted to another supply
Pump control module output stage shorted
Moisture or corrosion in the connector causing leakage current

Symptoms

  • Fuel pump keeps running after switch-off
  • Battery drained overnight
  • Check engine light on (GM after two trips)
  • Often nothing noticeable while driving

Repair estimate

DifficultyEasyDIY possible
Parts and labour€15–500
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel pump relayfuel pump control modulefuel pump wiring

Related codes

P0230P0231P0233P023FP0629

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com, saabwisonline.com.