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THE CODE DIRECTORY

Diagnostic code references — Page 79.

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

11,786 code references

Generic OBD-II
P237C

Exhaust Heat Exchanger Exhaust Bypass Valve A Control Circuit/Open

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Generic OBD-II
P237D

Exhaust Heat Exchanger Exhaust Bypass Valve A Control Circuit Low

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Generic OBD-II
P237E

Exhaust Heat Exchanger Exhaust Bypass Valve A Control Circuit High

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Generic OBD-II
P237F

Exhaust Heat Exchanger Exhaust Bypass Valve A Control Performance

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Generic OBD-II
P2380

EGR Sensor D Circuit

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Generic OBD-II
P2381

EGR Sensor D Circuit High

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Generic OBD-II
P2382

EGR Sensor D Circuit Low

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Generic OBD-II
P2383

EGR Sensor D Circuit Range/Performance

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Generic OBD-II
P2384

EGR Sensor D Circuit Intermittent

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Generic OBD-II
P2385

EGR Sensor E Circuit

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Generic OBD-II
P2386

EGR Sensor E Circuit High

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Generic OBD-II
P2387

EGR Sensor E Circuit Low

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Generic OBD-II
P2388

EGR Sensor E Circuit Range/Performance

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Generic OBD-II
P2389

EGR Sensor E Circuit Intermittent

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Generic OBD-II
P238A

Water in Fuel Sensor B Circuit

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Generic OBD-II
P238B

Water in Fuel Sensor B Circuit Range/Performance

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Generic OBD-II
P238C

Water in Fuel Sensor B Circuit Low

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Generic OBD-II
P238D

Water in Fuel Sensor B Circuit High

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Generic OBD-II
P238E

Water in Fuel Sensor B Circuit Intermittent

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Generic OBD-II
P238F

Water in Fuel Condition - Sensor B

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Generic OBD-II
P2390

Diesel Intake Air Flow B Control Circuit/Open

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Generic OBD-II
P2391

Diesel Intake Air Flow B Control Performance

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Generic OBD-II
P2392

Diesel Intake Air Flow B Control Circuit Low

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Generic OBD-II
P2393

Diesel Intake Air Flow B Control Circuit High

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Generic OBD-II
P2394

Diesel Intake Air Flow B Control Stuck Open

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Generic OBD-II
P2395

Diesel Intake Air Flow B Control Stuck Closed

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Generic OBD-II
P2396

Diesel Intake Air Flow B Position Sensor Circuit

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Generic OBD-II
P2397

Diesel Intake Air Flow B Position Sensor Range/Performance

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Generic OBD-II
P2398

Diesel Intake Air Flow B Position Sensor Circuit Low

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Generic OBD-II
P2399

Diesel Intake Air Flow B Position Sensor Circuit High

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Generic OBD-II
P239A

Diesel Intake Air Flow B Position Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P239B

Diesel Intake Air Flow B Control Motor Current Range/Performance

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Generic OBD-II
P239C

Diesel Intake Air Flow B Control System - High Air Flow Detected

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Generic OBD-II
P239D

Diesel Intake Air Flow B Control System - Low Air Flow Detected

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Generic OBD-II
P239E

O2 Sensor Out of Range During Deceleration Bank 1 Sensor 2

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Generic OBD-II
P239F

O2 Sensor Out of Range During Deceleration Bank 2 Sensor 2

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Generic OBD-II
P23A0

O2 Sensor Exhaust Sample Error Bank 1 Sensor 2

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Generic OBD-II
P23A1

O2 Sensor Exhaust Sample Error Bank 2 Sensor 2

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Generic OBD-II
P23A2

Exhaust Heat Exchanger Exhaust Bypass Valve B Control Circuit/Open

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Generic OBD-II
P23A3

Exhaust Heat Exchanger Exhaust Bypass Valve B Control Circuit Low

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Generic OBD-II
P23A4

Exhaust Heat Exchanger Exhaust Bypass Valve B Control Circuit High

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Generic OBD-II
P23A5

Exhaust Heat Exchanger Exhaust Bypass Valve B Control Performance

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Generic OBD-II
P23A6

Exhaust Heat Exchanger Exhaust Bypass Valve B Stuck Open

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Generic OBD-II
P23A7

Exhaust Heat Exchanger Exhaust Bypass Valve B Stuck Closed

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Generic OBD-II
P23A8

Exhaust Heat Exchanger Exhaust Bypass Valve B Position Sensor Stop Performance

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Generic OBD-II
P23A9

Communication Fault – Forced Engine Shutdown

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Generic OBD-II
P23AA

Turbocharger/Supercharger Bypass Valve A Stuck

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Generic OBD-II
P23AB

NOx Sensor Processor Performance Bank 1 Sensor 3

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Generic OBD-II
P23AC

NOx Sensor Circuit Bank 1 Sensor 3

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Generic OBD-II
P23AD

NOx Sensor Circuit Range/Performance Bank 1 Sensor 3

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Generic OBD-II
P23AE

NOx Sensor Circuit Low Bank 1 Sensor 3

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Generic OBD-II
P23AF

NOx Sensor Circuit High Bank 1 Sensor 3

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Generic OBD-II
P23B0

NOx Sensor Circuit Intermittent Bank 1 Sensor 3

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Generic OBD-II
P23B1

NOx Sensor Heater Control Circuit/Open Bank 1 Sensor 3

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Generic OBD-II
P23B2

NOx Sensor Heater Control Circuit Low Bank 1 Sensor 3

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Generic OBD-II
P23B3

NOx Sensor Heater Control Circuit High Bank 1 Sensor 3

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Generic OBD-II
P23B4

NOx Sensor Heater Sense Circuit Bank 1 Sensor 3

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Generic OBD-II
P23B5

NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 3

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Generic OBD-II
P23B6

NOx Sensor Supply Voltage Circuit Bank 1 Sensor 3

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Generic OBD-II
P23B7

NOx Sensor Heater Control Circuit Range/Performance Bank 1 Sensor 3

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Generic OBD-II
P23B8

NOx Sensor Heater Sense Circuit Low Bank 1 Sensor 3

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Generic OBD-II
P23B9

NOx Sensor Heater Sense Circuit High Bank 1 Sensor 3

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Generic OBD-II
P23BA

NOx Sensor Heater Sense Circuit Intermittent Bank 1 Sensor 3

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Generic OBD-II
P23BB

NOx Sensor Heater Resistance Bank 1 Sensor 3

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Generic OBD-II
P23BC

NOx Sensor Calibration Memory Bank 1 Sensor 3

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Generic OBD-II
P23BD

NOx Sensor Performance - Signal Biased/Stuck High Bank 1 Sensor 3

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Generic OBD-II
P23BE

NOx Sensor Performance - Signal Biased/Stuck Low Bank 1 Sensor 3

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Generic OBD-II
P23BF

NOx Sensor Performance - Slow Response Low to High Bank 1 Sensor 3

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Generic OBD-II
P23C0

NOx Sensor Performance - Slow Response High to Low Bank 1 Sensor 3

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Generic OBD-II
P23C1

NOx Sensor Performance - Sensing Element Bank 1 Sensor 3

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Generic OBD-II
P23C2

NOx Sensor Delayed Response - High to Low Bank 1 Sensor 3

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Generic OBD-II
P23C3

Engine Coolant Bypass Valve C Position Sensor Circuit

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Generic OBD-II
P23C4

Engine Coolant Bypass Valve C Position Sensor Circuit Low

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Generic OBD-II
P23C5

Engine Coolant Bypass Valve C Position Sensor Circuit High

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Generic OBD-II
P23C6

Engine Coolant Bypass Valve C Control Circuit Driver Current/Temperature Too High

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Generic OBD-II
P23C7

Fuel Heater Control Module Power Control Circuit/Open

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Generic OBD-II
P23C8

Fuel Heater Control Module Power Control Circuit Low

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Generic OBD-II
P23C9

Fuel Heater Control Module Power Control Circuit High

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Generic OBD-II
P23CA

Fuel Rail Heater Control Circuit/Open

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Generic OBD-II
P23CB

Fuel Rail Heater Control Circuit Low

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Generic OBD-II
P23CC

Fuel Rail Heater Control Circuit High

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Generic OBD-II
P23CD

Fuel Heater Control Module Feedback Signal/Open

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Generic OBD-II
P23CE

Fuel Heater Control Module Feedback Signal Performance

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Generic OBD-II
P23CF

Fuel Heater Control Module Feedback Signal Circuit Low

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Generic OBD-II
P23D0

Fuel Heater Control Module Feedback Signal Circuit High

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Generic OBD-II
P23D1

Cylinder 1 Fuel Heater Control Circuit/Open

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Generic OBD-II
P23D2

Cylinder 1 Fuel Heater Control Circuit High

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Generic OBD-II
P23D3

Cylinder 1 Fuel Heater Control Circuit Low

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Generic OBD-II
P23D4

Cylinder 1 Fuel Heater Performance

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Generic OBD-II
P23D5

Cylinder 2 Fuel Heater Control Circuit/Open

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Generic OBD-II
P23D6

Cylinder 2 Fuel Heater Control Circuit High

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Generic OBD-II
P23D7

Cylinder 2 Fuel Heater Control Circuit Low

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Generic OBD-II
P23D8

Cylinder 2 Fuel Heater Performance

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Generic OBD-II
P23D9

Cylinder 3 Fuel Heater Control Circuit/Open

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Generic OBD-II
P23DA

Cylinder 3 Fuel Heater Control Circuit High

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Generic OBD-II
P23DB

Cylinder 3 Fuel Heater Control Circuit Low

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Generic OBD-II
P23DC

Cylinder 3 Fuel Heater Performance

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Generic OBD-II
P23DD

Cylinder 4 Fuel Heater Control Circuit/Open

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Generic OBD-II
P23DE

Cylinder 4 Fuel Heater Control Circuit High

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Generic OBD-II
P23DF

Cylinder 4 Fuel Heater Control 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.