P CODE FAMILY

Powertrain code references — Page 38.

Engine, transmission and powertrain diagnostic references. Exact vehicle and module context still matters.

Generic OBD-II

P0EFB

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.

Battery Charger A Input Voltage Sensor C Circuit

Battery Charger A Input Voltage Sensor C Circuit Range/Performance

Battery Charger A Input Voltage Sensor C Circuit Low

Battery Charger A Input Voltage Sensor C Circuit High

Ford readiness monitors have not finished

OBD Systems Readiness Test Not Complete

OBD II Monitor Testing Not Completed

Ford engine-running self-test did not complete

Unable to Achieve Self-Test Function Or SCP Error

Oxygen-sensor heater current-monitor circuit fault

Upstream oxygen-sensor heater warm-up control circuit

Vehicle Speed Signal Missing or Improper

Brake Switch Signal Missing or Improper

Resolve the BMW rich/lean mapping before choosing a diagnosis

Fuel Control Mixture Rich Bank 1 Sensor 1

Fuel Control Mixture Lean Bank 2 Sensor 1

Fuel Control Mixture Rich Bank 2 Sensor 1

Subaru left TGV position signal reads low

O2 Sensor Circuit Slow Response in Lean Control Range Bank 1 Sensor 1

Subaru left TGV position signal reads high

O2 Sensor Circuit Slow Response in Rich Control Range Bank 1 Sensor 1

Subaru right TGV low-input diagnosis

O2 Sensor Circuit Slow Response in Lean Control Range Bank 1 Sensor 2

Subaru right TGV high-input diagnosis

Pre-Catalyst Fuel Trim Too Lean Bank 1

Subaru right tumble valve stuck open

Pre-Catalyst Fuel Trim Too Rich Bank 1

Subaru right tumble valve stuck closed

Pre-Catalyst Fuel Trim Too Lean Bank 2

Subaru left tumble valve stuck open

Pre-Catalyst Fuel Trim Too Rich Bank 2

Subaru left tumble valve stuck closed

O2 Sensor Circuit Slow Response in Rich Control Range Bank 2 Sensor 1

Subaru right TGV actuator open circuit

O2 Sensor Circuit Slow Switching From Lean to Rich Bank 1 Sensor 1

Subaru right TGV actuator overcurrent

O2 Sensor Circuit Slow Switching From Lean to Rich Bank 2 Sensor 1

Subaru left TGV actuator open circuit

O2 Sensor Circuit Slow Response After Coast Down Fuel Cut-off Bank 1 Sensor 2

Subaru left TGV actuator overcurrent

O2 Sensor Circuit Slow Response After Coast Down Fuel Cutoff Bank 2 Sensor 2

Ford MAF signal intermittently changes beyond its limits

BARO Sensor Circuit Malfunction

Mass Air Flow Sensor Circuit Intermittent

Induction Control Motor Position Sensor Fault

Starter Switch Circuit Malfunction

BARO Sensor Circuit

Ford MAF reading is outside the self-test window

Mass Air Flow Sensor Circuit Out Of Self-Test Range

Traction Control Vacuum Solenoid Circuit Fault

Neutral Position Switch Circuit Malfunction M/T

Oxygen Sensor Circuit Bank 1 Sensor 1 Voltage Too Low/Air Leak

HO2S11 Heater Circuit High Voltage

Mass Air Flow Sensor Signal Inconsistent With Throttle Position Sensor

Traction Control Ventilation Solenoid Circuit Fault

Pressure Sources Solenoid Valve Circuit Malfunction

Oxygen Sensor Heating Circuit Bank 1 Sensor 1 Voltage Too Low/Air Leak

Mass Air Flow Sensor Signal Inconsistent With Engine Speed

Turbocharger Wastegate Actuator

Pressure Sources Switching Solenoid Valve Circuit

Oxygen Sensor Heating Circuit Bank 1 Sensor 1 Short To B+

Jaguar AJ26 MAF ground fault and substitute load calculation

Turbocharger Wastegate Solenoid

Engine Torque Control Signal Circuit Malfunction

Oxygen Sensor Bank 1 Sensor 2 Voltage Too Low/Air Leak

Secondary Vacuum Sensor Circuit

Dual Alternator Upper Fault

Open Or Shorted Condition Detected In The Baro Read Solenoid Control Circuit

HO2S12 Heater Circuit High Voltage

Atmospheric Pressure Sensor In Control Module

Fuel Pressure Solenoid

Nissan MAP/BARO switching fault: electrical and vacuum branches

Oxygen Sensor Heating Circuit Bank 1 Sensor 2 Short To B+

MAP Sensor Circuit Intermittent High Voltage

Honda BARO and MAP readings disagree

Engine Torque Control Signal 2 Circuit Malfunction

Oxygen Sensor Circuit Bank 2 Sensor 1 Voltage Too Low/Air Leak

MAP Sensor Circuit Intermittent Low Voltage

Honda internal BARO low-voltage monitor

AIR System Diagnosis Solenoid Circuit Fault