THE CODE DIRECTORY
Diagnostic code references — Page 79.
Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.
Generic OBD-II
P237C
Exhaust Heat Exchanger Exhaust Bypass Valve A Control Circuit/Open
PowertrainRead the code
Generic OBD-II
P237D
Exhaust Heat Exchanger Exhaust Bypass Valve A Control Circuit Low
PowertrainRead the code
Generic OBD-II
P237E
Exhaust Heat Exchanger Exhaust Bypass Valve A Control Circuit High
PowertrainRead the code
Generic OBD-II
P237F
Exhaust Heat Exchanger Exhaust Bypass Valve A Control Performance
PowertrainRead the code
Generic OBD-II
P2380
EGR sensor internal status must be separated from lost communication
PowertrainRead article
Generic OBD-II
P2381
low-pressure EGR differential-pressure signal high
PowertrainRead article
Generic OBD-II
P2382
low-pressure EGR differential-pressure signal low
PowertrainRead article
Generic OBD-II
P2383
EGR differential-pressure offset is implausible at key-off
PowertrainRead article
Generic OBD-II
P2384
EGR differential-pressure signal changes too quickly
PowertrainRead article
Generic OBD-II
P2385
EGR Sensor E Circuit
PowertrainRead the code
Generic OBD-II
P2386
EGR Sensor E Circuit High
PowertrainRead the code
Generic OBD-II
P2387
EGR Sensor E Circuit Low
PowertrainRead the code
Generic OBD-II
P2388
EGR Sensor E Circuit Range/Performance
PowertrainRead the code
Generic OBD-II
P2389
EGR Sensor E Circuit Intermittent
PowertrainRead the code
Generic OBD-II
P238A
Water in Fuel Sensor B Circuit
PowertrainRead the code
Generic OBD-II
P238B
Water in Fuel Sensor B Circuit Range/Performance
PowertrainRead the code
Generic OBD-II
P238C
Water in Fuel Sensor B Circuit Low
PowertrainRead the code
Generic OBD-II
P238D
Water in Fuel Sensor B Circuit High
PowertrainRead the code
Generic OBD-II
P238E
Water in Fuel Sensor B Circuit Intermittent
PowertrainRead the code
Generic OBD-II
P238F
Water in Fuel Condition - Sensor B
PowertrainRead the code
Generic OBD-II
P2390
Diesel Intake Air Flow B Control Circuit/Open
PowertrainRead the code
Generic OBD-II
P2391
Diesel Intake Air Flow B Control Performance
PowertrainRead the code
Generic OBD-II
P2392
Diesel Intake Air Flow B Control Circuit Low
PowertrainRead the code
Generic OBD-II
P2393
Diesel Intake Air Flow B Control Circuit High
PowertrainRead the code
Generic OBD-II
P2394
Diesel Intake Air Flow B Control Stuck Open
PowertrainRead the code
Generic OBD-II
P2395
Diesel Intake Air Flow B Control Stuck Closed
PowertrainRead the code
Generic OBD-II
P2396
Diesel Intake Air Flow B Position Sensor Circuit
PowertrainRead the code
Generic OBD-II
P2397
Diesel Intake Air Flow B Position Sensor Range/Performance
PowertrainRead the code
Generic OBD-II
P2398
Diesel Intake Air Flow B Position Sensor Circuit Low
PowertrainRead the code
Generic OBD-II
P2399
Diesel Intake Air Flow B Position Sensor Circuit High
PowertrainRead the code
Generic OBD-II
P239A
Diesel Intake Air Flow B Position Sensor Circuit Intermittent/Erratic
PowertrainRead the code
Generic OBD-II
P239B
Diesel Intake Air Flow B Control Motor Current Range/Performance
PowertrainRead the code
Generic OBD-II
P239C
Diesel Intake Air Flow B Control System - High Air Flow Detected
PowertrainRead the code
Generic OBD-II
P239D
Diesel Intake Air Flow B Control System - Low Air Flow Detected
PowertrainRead the code
Generic OBD-II
P239E
NOx sensor oxygen reading too high during diesel deceleration
PowertrainRead article
Generic OBD-II
P239F
O2 Sensor Out of Range During Deceleration Bank 2 Sensor 2
PowertrainRead the code
Generic OBD-II
P23A0
O2 Sensor Exhaust Sample Error Bank 1 Sensor 2
PowertrainRead the code
Generic OBD-II
P23A1
O2 Sensor Exhaust Sample Error Bank 2 Sensor 2
PowertrainRead the code
Generic OBD-II
P23A2
Exhaust Heat Exchanger Exhaust Bypass Valve B Control Circuit/Open
PowertrainRead the code
Generic OBD-II
P23A3
Exhaust Heat Exchanger Exhaust Bypass Valve B Control Circuit Low
PowertrainRead the code
Generic OBD-II
P23A4
Exhaust Heat Exchanger Exhaust Bypass Valve B Control Circuit High
PowertrainRead the code
Generic OBD-II
P23A5
Exhaust Heat Exchanger Exhaust Bypass Valve B Control Performance
PowertrainRead the code
Generic OBD-II
P23A6
Exhaust Heat Exchanger Exhaust Bypass Valve B Stuck Open
PowertrainRead the code
Generic OBD-II
P23A7
Exhaust Heat Exchanger Exhaust Bypass Valve B Stuck Closed
PowertrainRead the code
Generic OBD-II
P23A8
Exhaust Heat Exchanger Exhaust Bypass Valve B Position Sensor Stop Performance
PowertrainRead the code
Generic OBD-II
P23A9
Communication Fault – Forced Engine Shutdown
PowertrainRead the code
Generic OBD-II
P23AA
How pressure pulsations expose a stuck turbo bypass valve
PowertrainRead article
Generic OBD-II
P23AB
NOx Sensor Processor Performance Bank 1 Sensor 3
PowertrainRead the code
Generic OBD-II
P23AC
NOx Sensor Circuit Bank 1 Sensor 3
PowertrainRead the code
Generic OBD-II
P23AD
NOx sensor 3 internal current control is unstable
PowertrainRead article
Generic OBD-II
P23AE
NOx sensor 3 reports below the lower concentration limit
PowertrainRead article
Generic OBD-II
P23AF
NOx sensor 3 exceeds the upper concentration range
PowertrainRead article
Generic OBD-II
P23B0
NOx Sensor Circuit Intermittent Bank 1 Sensor 3
PowertrainRead the code
Generic OBD-II
P23B1
open heater-control circuit at NOx sensor 3
PowertrainRead article
Generic OBD-II
P23B2
NOx sensor 3 heater control is shorted low
PowertrainRead article
Generic OBD-II
P23B3
NOx sensor 3 heater control is shorted high
PowertrainRead article
Generic OBD-II
P23B4
NOx sensor 3 heater-resistance sensing circuit is open
PowertrainRead article
Generic OBD-II
P23B5
NOx sensor 3 heater resistance misses its target
PowertrainRead article
Generic OBD-II
P23B6
NOx sensor 3 supply voltage is below range
PowertrainRead article
Generic OBD-II
P23B7
NOx Sensor Heater Control Circuit Range/Performance Bank 1 Sensor 3
PowertrainRead the code
Generic OBD-II
P23B8
NOx sensor 3 heater-sense path shorted to ground
PowertrainRead article
Generic OBD-II
P23B9
NOx sensor 3 heater-sense path shorted to power
PowertrainRead article
Generic OBD-II
P23BA
NOx Sensor Heater Sense Circuit Intermittent Bank 1 Sensor 3
PowertrainRead the code
Generic OBD-II
P23BB
NOx Sensor Heater Resistance Bank 1 Sensor 3
PowertrainRead the code
Generic OBD-II
P23BC
NOx Sensor Calibration Memory Bank 1 Sensor 3
PowertrainRead the code
Generic OBD-II
P23BD
NOx Sensor Performance - Signal Biased/Stuck High Bank 1 Sensor 3
PowertrainRead the code
Generic OBD-II
P23BE
NOx Sensor Performance - Signal Biased/Stuck Low Bank 1 Sensor 3
PowertrainRead the code
Generic OBD-II
P23BF
NOx Sensor Performance - Slow Response Low to High Bank 1 Sensor 3
PowertrainRead the code
Generic OBD-II
P23C0
NOx Sensor Performance - Slow Response High to Low Bank 1 Sensor 3
PowertrainRead the code
Generic OBD-II
P23C1
NOx sensor 3 sensing cavities fail an afterrun self-test
PowertrainRead article
Generic OBD-II
P23C2
NOx Sensor Delayed Response - High to Low Bank 1 Sensor 3
PowertrainRead the code
Generic OBD-II
P23C3
Engine Coolant Bypass Valve C Position Sensor Circuit
PowertrainRead the code
Generic OBD-II
P23C4
coolant bypass valve C digital position signal low
PowertrainRead article
Generic OBD-II
P23C5
coolant bypass valve C digital position signal high
PowertrainRead article
Generic OBD-II
P23C6
coolant bypass valve C motor driver overcurrent
PowertrainRead article
Generic OBD-II
P23C7
Fuel Heater Control Module Power Control Circuit/Open
PowertrainRead the code
Generic OBD-II
P23C8
Fuel Heater Control Module Power Control Circuit Low
PowertrainRead the code
Generic OBD-II
P23C9
Fuel Heater Control Module Power Control Circuit High
PowertrainRead the code
Generic OBD-II
P23CA
Fuel Rail Heater Control Circuit/Open
PowertrainRead the code
Generic OBD-II
P23CB
Fuel Rail Heater Control Circuit Low
PowertrainRead the code
Generic OBD-II
P23CC
Fuel Rail Heater Control Circuit High
PowertrainRead the code
Generic OBD-II
P23CD
Fuel Heater Control Module Feedback Signal/Open
PowertrainRead the code
Generic OBD-II
P23CE
Fuel Heater Control Module Feedback Signal Performance
PowertrainRead the code
Generic OBD-II
P23CF
Fuel Heater Control Module Feedback Signal Circuit Low
PowertrainRead the code
Generic OBD-II
P23D0
Fuel Heater Control Module Feedback Signal Circuit High
PowertrainRead the code
Generic OBD-II
P23D1
Cylinder 1 Fuel Heater Control Circuit/Open
PowertrainRead the code
Generic OBD-II
P23D2
Cylinder 1 Fuel Heater Control Circuit High
PowertrainRead the code
Generic OBD-II
P23D3
Cylinder 1 Fuel Heater Control Circuit Low
PowertrainRead the code
Generic OBD-II
P23D4
Cylinder 1 Fuel Heater Performance
PowertrainRead the code
Generic OBD-II
P23D5
Cylinder 2 Fuel Heater Control Circuit/Open
PowertrainRead the code
Generic OBD-II
P23D6
Cylinder 2 Fuel Heater Control Circuit High
PowertrainRead the code
Generic OBD-II
P23D7
Cylinder 2 Fuel Heater Control Circuit Low
PowertrainRead the code
Generic OBD-II
P23D8
Cylinder 2 Fuel Heater Performance
PowertrainRead the code
Generic OBD-II
P23D9
Cylinder 3 Fuel Heater Control Circuit/Open
PowertrainRead the code
Generic OBD-II
P23DA
Cylinder 3 Fuel Heater Control Circuit High
PowertrainRead the code
Generic OBD-II
P23DB
Cylinder 3 Fuel Heater Control Circuit Low
PowertrainRead the code
Generic OBD-II
P23DC
Cylinder 3 Fuel Heater Performance
PowertrainRead the code
Generic OBD-II
P23DD
Cylinder 4 Fuel Heater Control Circuit/Open
PowertrainRead the code
Generic OBD-II
P23DE
Cylinder 4 Fuel Heater Control Circuit High
PowertrainRead the code
Generic OBD-II
P23DF
Cylinder 4 Fuel Heater Control Circuit Low
PowertrainRead the code
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.