Powertrain, generic (extended)

P2BB3 Fuel Pump Secondary Circuit Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Where a separate driver module powers the fuel pump, the ECM sends a duty-cycle command and the module reports what it actually applies. P2BB3 means these two values disagree beyond a tolerance, so the pump is not running at the requested speed although no open or short has been found. GM documents this in its 2018 engine tables (18OBDG04) for vehicles with a fuel tank zone module: its fuel pump driver control module compares measured with received duty cycle every 12.5 ms once ignition voltage exceeds 6 V, sensor-bus data are valid and P0231, P0232, P023F and the driver overtemperature fault P1255 are absent; Type A, MIL on the first trip. Ford's petrol summary checks the pump secondary circuit only with P0231/P0232 and its own P1237. Expect weak fuel pressure.

Likely causes

Fuel pump driver or tank zone module not delivering the commanded output
High resistance in the pump supply or ground connection
Worn or binding fuel pump drawing abnormal current
Disturbed data link between ECM and pump module

Symptoms

  • MIL on
  • Hesitation or power loss under load
  • Long cranking or stalling

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–900
Time0.5–3 h

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

Parts involved

fuel pumpfuel pump control modulewiring harness

Related codes

P0231P0232P023FP0233P064AP0087

References: gsi.ext.gm.com, fordservicecontent.com.