THE CODE DIRECTORY
Diagnostic code references — Page 97.
Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.
Generic OBD-II
P2B9B
Vehicle Conditions Incorrect for Particulate Matter Sensor Regeneration
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Generic OBD-II
P2B9C
Pump A actuator-stuck status is narrower than a cooling-system diagnosis
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Generic OBD-II
P2B9D
Pump A supply status cannot be inferred from one battery reading
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Generic OBD-II
P2B9E
A pump A thermal report does not directly measure engine overheating
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Generic OBD-II
P2B9F
An underspeed report needs a command relationship and correct pump identity
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Generic OBD-II
P2BA0
A pump underspeed label must be read through the reported-speed format
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Generic OBD-II
P2BA1
Coolant Pump D Underspeed
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Generic OBD-II
P2BA2
The cited pump-stalled row actually checks speed while commanded off
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Generic OBD-II
P2BA3
Starter-generator belt performance inferred from speed ratio
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Generic OBD-II
P2BA4
Catalyst Feedgas Performance
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Generic OBD-II
P2BA5
Particulate Filter Feedgas Performance
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Generic OBD-II
P2BA6
NOx Exceedance - SCR NOx Catalyst Performance
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Generic OBD-II
P2BA7
NOx Exceedence - Empty Reagent Tank
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Generic OBD-II
P2BA8
NOx Exceedence - Interruption of Reagent Dosing Activity
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Generic OBD-II
P2BA9
NOx Exceedence - Insufficient Reagent Quality
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Generic OBD-II
P2BAA
NOx Exceedence - Low Reagent Consumption
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Generic OBD-II
P2BAB
NOx Exceedence - Incorrect EGR Flow
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Generic OBD-II
P2BAC
NOx Exceedence - Deactivation of EGR
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Generic OBD-II
P2BAD
Duramax fluid-quality messages and the difference between a failed and unfinished test
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Generic OBD-II
P2BAE
NOx Exceedence - NOx control monitoring system
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Generic OBD-II
P2BAF
Compass diesel inducement warning linked to a BCM software version
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Generic OBD-II
P2BB0
Alternative Fuel Consumption Too Low
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Generic OBD-II
P2BB1
Alternative Fuel Consumption Too High
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Generic OBD-II
P2BB2
Alternative Fuel Tank Empty
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Generic OBD-II
P2BB3
Fuel Pump Secondary Circuit Performance
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Generic OBD-II
P2BB4
Engine Coolant Temperature Sensor 4 Circuit Intermittent/Erratic
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Generic OBD-II
P2BB5
Sensor 5 erratic temperature is a rate-of-change judgment
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Generic OBD-II
P2BB6
Engine Coolant Temperature Sensor 6 Circuit
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Generic OBD-II
P2BB7
Engine Coolant Temperature Sensor 6 Circuit Range/Performance
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Generic OBD-II
P2BB8
Coolant sensor 6 circuit low follows a logical-to-input mapping
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Generic OBD-II
P2BB9
Coolant sensor 6 circuit high has contradictory assignment wording
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Generic OBD-II
P2BBA
Sensor 6’s implausible temperature jump uses its own response model
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Generic OBD-II
P2BBB
Turbocharger/Supercharger Bypass Valve A Position Sensor Circuit
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Generic OBD-II
P2BBC
Air bypass valve position circuit below its signal range
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Generic OBD-II
P2BBD
Air bypass position signal high, including open-circuit causes
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Generic OBD-II
P2BBE
Turbocharger/Supercharger Bypass Valve A Position Exceeded Learning Limit
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Generic OBD-II
P2BBF
Turbocharger/Supercharger Bypass Valve A Supply Voltage Low
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Generic OBD-II
P2BC0
Turbocharger/Supercharger Bypass Valve A Driver Current/Temperature Too High
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Generic OBD-II
P2BC1
Charge Air Cooler Coolant Pump A Stuck/Stalled
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Generic OBD-II
P2BC2
Charge Air Cooler Coolant Pump A Supply Voltage Circuit
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Generic OBD-II
P2BC3
Charge Air Cooler Coolant Pump A Control Module Overtemperature
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Generic OBD-II
P2BC4
Battery Charging System Positive Contactor B Circuit
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Generic OBD-II
P2BC5
Battery Charging System Positive Contactor B Stuck Closed
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Generic OBD-II
P2BC6
Battery Charging System Positive Contactor B Stuck Open
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Generic OBD-II
P2BC7
Battery Charging System Positive Contactor B Control Circuit/Open
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Generic OBD-II
P2BC8
Battery Charging System Positive Contactor B Control Circuit Range/Performance
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Generic OBD-II
P2BC9
Battery Charging System Positive Contactor B Control Circuit Low
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Generic OBD-II
P2BCA
Battery Charging System Positive Contactor B Control Circuit High
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Generic OBD-II
P2BCB
Battery Charging System Negative Contactor B Circuit
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Generic OBD-II
P2BCC
Battery Charging System Negative Contactor B Stuck Closed
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Generic OBD-II
P2BCD
Battery Charging System Negative Contactor B Stuck Open
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Generic OBD-II
P2BCE
Battery Charging System Negative Contactor B Control Circuit/Open
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Generic OBD-II
P2BCF
Battery Charging System Negative Contactor B Control Circuit Range/Performance
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Generic OBD-II
P2BD0
Battery Charging System Negative Contactor B Control Circuit Low
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Generic OBD-II
P2BD1
Battery Charging System Negative Contactor B Control Circuit High
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Generic OBD-II
P2BD2
Exhaust Aftertreatment System A Leak
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Generic OBD-II
P2BD3
Exhaust Aftertreatment System B Leak
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Generic OBD-II
P2BD4
Motor Electronics Coolant Pump C Control Circuit/Open
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Generic OBD-II
P2BD5
Motor Electronics Coolant Pump C Control Circuit Low
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Generic OBD-II
P2BD6
Motor Electronics Coolant Pump C Control Circuit High
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Generic OBD-II
P2BD7
Motor Electronics Coolant Pump C Control Performance
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Generic OBD-II
P2BD8
Motor Electronics Coolant Temperature Sensor B Circuit
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Generic OBD-II
P2BD9
Motor Electronics Coolant Temperature Sensor B Circuit Range/Performance
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Generic OBD-II
P2BDA
Motor Electronics Coolant Temperature Sensor B Circuit Low
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Generic OBD-II
P2BDB
Motor Electronics Coolant Temperature Sensor B Circuit High
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Generic OBD-II
P2BDC
Motor Electronics Coolant Temperature Sensor C Circuit
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Generic OBD-II
P2BDD
Motor Electronics Coolant Temperature Sensor C Circuit Range/Performance
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Generic OBD-II
P2BDE
Motor Electronics Coolant Temperature Sensor C Circuit Low
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Generic OBD-II
P2BDF
Motor Electronics Coolant Temperature Sensor C Circuit High
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Generic OBD-II
P2BE0
Hybrid/EV Battery Coolant Level Sensor Circuit/Open
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Generic OBD-II
P2BE1
Hybrid/EV Battery Coolant Level Sensor Range/Performance
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Generic OBD-II
P2BE2
Hybrid/EV Battery Coolant Level Sensor Circuit Low
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Generic OBD-II
P2BE3
Hybrid/EV Battery Coolant Level Sensor Circuit High
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Generic OBD-II
P2BE4
Hybrid/EV Battery Pack Current Sensor C Circuit
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Generic OBD-II
P2BE5
Hybrid/EV Battery Pack Current Sensor C Circuit Range/Performance
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Generic OBD-II
P2BE6
Hybrid/EV Battery Pack Current Sensor C Low
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Generic OBD-II
P2BE7
Hybrid/EV Battery Pack Current Sensor C High
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Generic OBD-II
P2BE8
Hybrid/EV Battery Precharge Contactor Control Circuit B Open
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Generic OBD-II
P2BE9
Hybrid/EV Battery Precharge Contactor Control Circuit B Range/Performance
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Generic OBD-II
P2BEA
Hybrid/EV Battery Precharge Contactor Control Circuit B Low
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Generic OBD-II
P2BEB
Hybrid/EV Battery Precharge Contactor Control Circuit B High
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Generic OBD-II
P2BEC
Bank 1 lean control in direct-injection mode needs the correct fuel-trim context
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Generic OBD-II
P2BED
Direct-injection bank 1 rich control needs mode-specific evidence
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Generic OBD-II
P2BEE
Direct-injection bank 2 lean control should not be mixed with another fuel mode
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Generic OBD-II
P2BEF
Fuel Control System A Too Rich Bank 2
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Generic OBD-II
P2BF0
Excessive positive adaptation on bank 1 port injection
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Generic OBD-II
P2BF1
Bank 1 port-injection adaptation below its rich limit
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Generic OBD-II
P2BF2
Bank 2 port-injection correction above the lean limit
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Generic OBD-II
P2BF3
Low bank 2 port-injection adaptation and the rich diagnosis
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Generic OBD-II
P2BF4
Exhaust Flow Control Valve A Position Circuit
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Generic OBD-II
P2BF5
Warm exhaust shutter does not track its commanded opening
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Generic OBD-II
P2BF6
Exhaust shutter position signal electrically low
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Generic OBD-II
P2BF7
Exhaust shutter position signal electrically high
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Generic OBD-II
P2BF8
An open-circuit report from exhaust valve B control
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Generic OBD-II
P2BF9
Ground-short status on the exhaust valve B PWM circuit
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Generic OBD-II
P2BFA
Power-short status from exhaust valve B control
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Generic OBD-II
P2BFB
Bank2 exhaust-valve performance must retain its feedback path
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Generic OBD-II
P2BFC
Exhaust Flow Control Valve B Position Circuit
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Generic OBD-II
P2BFD
Exhaust Flow Control Valve B Position Circuit Range/Performance
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Generic OBD-II
P2BFE
Exhaust Flow Control Valve B Position Circuit Low
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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.