THE CODE DIRECTORY

Diagnostic code references — Page 98.

Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.

Generic OBD-II

P2BFF

These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.

Exhaust Flow Control Valve B Position Circuit High

Fuel Pressure Regulator C Performance

Fuel regulator D control effort outside its plausible range

An open fuel-quantity control circuit in the regulator D path

Low-side ground-short diagnosis in fuel regulator D control

Fuel regulator D output stays high during an on command

Intake profile-position sensor A has a driver-level circuit check

Intake Hall sensor A reports a profile shift that was never requested

Sensor A circuit low belongs to the powered intake-profile output

Intake sensor A circuit high is checked after the output is switched off

Intake profile-position channel B has its own open-circuit result

Hall sensor B can report a valid-looking sequence at the wrong time

The intake B-channel low fault requires an energized output

Intake channel B retains a power-short indication while commanded off

Intake profile channel C is electrically open under its on command

Intake Hall sensor C reports movement without a requested shift

Intake channel C circuit low is evaluated with drive applied

Intake profile sensor C has an off-state power-short check

Reductant pump current depends on heating or pumping mode

Exhaust camshaft sensor A must not be confused with intake sensor B

Exhaust Hall sensor A reports a shift with no matching request

Exhaust sensor A circuit low is a powered-driver classification

Exhaust profile sensor A circuit high is judged with the driver off

Exhaust profile-position sensor B is checked for an energized open path

Exhaust Hall sensor B can report movement that the controller never commanded

The exhaust B-channel low fault requires an on-state electrical check

Exhaust sensor B remains electrically high after switch-off

B Camshaft Profile Actuator Position Sensor C Circuit Bank 1

B Camshaft Profile Actuator Position Sensor C Range/Performance Bank 1

B Camshaft Profile Actuator Position Sensor C Circuit Low Bank 1

B Camshaft Profile Actuator Position Sensor C Circuit High Bank 1

high-pressure pump control reaches its cold-start limits

rail pressure falls short during catalyst warm-up

rail pressure exceeds its catalyst warm-up target

two sump oil-temperature readings disagree

Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Circuit

Ford hybrid exhaust heat-exchanger connector checks

Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Circuit Low

Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Circuit High

Fuel Injector Group B Supply Sense Circuit

Fuel Injector Group B Supply Sense Circuit Low

Fuel Injector Group B Supply Sense Circuit High

Detecting a stuck bypass valve from pressure pulsations

Turbocharger/Supercharger Bypass Valve B Position Sensor Circuit/Open

Turbocharger/Supercharger Bypass Valve B Position Sensor Circuit Low

Turbocharger/Supercharger Bypass Valve B Position Sensor Circuit High

Turbocharger/Supercharger Bypass Valve B Position Exceeded Learning Limit

Turbocharger/Supercharger Bypass Valve B Supply Voltage Low

Turbocharger/Supercharger Bypass Valve B Driver Current/Temperature Too High

Ignition Coil Primary Circuit Fuse A

Ignition Coil Primary Circuit Fuse B

Crankcase Pressure Sensor B Circuit

Crankcase Pressure Sensor B Circuit Range/Performance

Crankcase Pressure Sensor B Circuit Low

Crankcase Pressure Sensor B Circuit High

Crankcase Pressure Sensor B Circuit Intermittent/Erratic

Cold Start Engine Coolant Pump Performance

Cylinder Head Temperature Sensor B Circuit

F-150 2.7L temperature warnings need model-year-specific diagnosis

Cylinder Head Temperature Sensor B Circuit Low

Cylinder Head Temperature Sensor B Circuit High

Cylinder Head Temperature Sensor B Circuit Intermittent/Erratic

Cylinder Head Temperature Sensor A/B Correlation

Fan 4 Control Circuit

Fan 4 Control Circuit Low

Fan 4 Control Circuit High

Fan 3 Performance/Stuck Off

Fan 4 Performance/Stuck Off

Battery Isolation/Voltage Stabilization Control Circuit

PowerBoost ground integrity before auxiliary battery isolator replacement

Battery Isolation/Voltage Stabilization Control Circuit Low

Battery Isolation/Voltage Stabilization Control Circuit High

Battery Isolation/Voltage Stabilization Control Circuit Intermittent

Coolant-pump performance is inferred from phase-current behavior

Coolant Pump D Control Circuit Performance/Stuck Off

Clutch Actuator Position Sensor Circuit

Clutch Actuator Position Sensor Circuit Range/Performance

Do not borrow throttle-voltage limits for a clutch-actuation sensor

High clutch-actuation feedback needs its own circuit specification

Clutch Actuator Position Sensor Circuit Intermittent/Erratic