THE CODE DIRECTORY
Diagnostic code references — Page 87.
Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.
Generic OBD-II
P269C
Exhaust Aftertreatment Glow Plug Control Performance
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Generic OBD-II
P269D
Exhaust Aftertreatment Glow Plug Control Circuit Low
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Generic OBD-II
P269E
Exhaust Aftertreatment Glow Plug Control Circuit High
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Generic OBD-II
P269F
Exhaust Aftertreatment Glow Plug Circuit/Open
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Generic OBD-II
P26A0
Exhaust Aftertreatment Glow Plug Performance
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Generic OBD-II
P26A1
Exhaust Aftertreatment Glow Plug Circuit Low
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Generic OBD-II
P26A2
Exhaust Aftertreatment Glow Plug Circuit High
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Generic OBD-II
P26A3
Ram coolant-valve performance fault: ground test before contamination repair
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Generic OBD-II
P26A4
Engine Coolant Bypass Valve A Position Sensor Circuit
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Generic OBD-II
P26A5
bypass-valve feedback falls into an unexpected position band
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Generic OBD-II
P26A6
coolant-bypass valve feedback is below its electrical range
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Generic OBD-II
P26A7
high valve feedback is not proof of a fully open bypass
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Generic OBD-II
P26A8
Engine Coolant Bypass Valve A Position Sensor Circuit Intermittent/Erratic
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Generic OBD-II
P26A9
a failed coolant-bypass endpoint learn needs its fault context
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Generic OBD-II
P26AA
Engine Coolant Bypass Valve A Position Sensor Maximum Stop Performance
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Generic OBD-II
P26AB
Early 2013 Ram coolant-bypass warning with a PCM calibration remedy
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Generic OBD-II
P26AC
The B bypass valve controls transmission cooling in this Ford example
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Generic OBD-II
P26AD
Coolant bypass-valve drive 2 reads low during a high command
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Generic OBD-II
P26AE
A high transmission-cooling valve circuit is a short-to-battery classification
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Generic OBD-II
P26AF
Engine Coolant Bypass Valve B Stuck/Open
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Generic OBD-II
P26B0
Engine Coolant Bypass Valve B Range/Performance
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Generic OBD-II
P26B1
Engine Coolant Bypass Valve A Stuck Closed
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Generic OBD-II
P26B2
Engine Coolant Bypass Valve B Stuck Closed
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Generic OBD-II
P26B3
Fuel Shutoff Valve A Control Circuit Performance/Stuck Off
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Generic OBD-II
P26B4
Fuel Shutoff Valve A Control Circuit Stuck On
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Generic OBD-II
P26B5
Fuel Shutoff Valve B Control Circuit Performance/Stuck Off
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Generic OBD-II
P26B6
Fuel Shutoff Valve B Control Circuit Stuck On
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Generic OBD-II
P26B7
coolant bypass valve C motor-control circuit is open
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Generic OBD-II
P26B8
coolant bypass valve C driver reports a ground short
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Generic OBD-II
P26B9
coolant bypass valve C driver reports a power short
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Generic OBD-II
P26BA
Engine Coolant Bypass Valve C Stuck/Open
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Generic OBD-II
P26BB
coolant bypass valve C cannot follow its position target
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Generic OBD-II
P26BC
Engine Coolant Bypass Valve C Stuck Closed
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Generic OBD-II
P26BD
Cabin-heating valve D has its own output-circuit monitor
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Generic OBD-II
P26BE
Engine Coolant Bypass Valve D Control Circuit Low
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Generic OBD-II
P26BF
A cabin-heating valve high-circuit result needs electrical localization
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Generic OBD-II
P26C0
A coolant valve is classified open only after target error is established
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Generic OBD-II
P26C1
Engine Coolant Bypass Valve D Range/Performance
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Generic OBD-II
P26C2
Low-side coolant-valve position must also miss its target
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Generic OBD-II
P26C3
Internal range supervision preserves A, B and correlation distinctions
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Generic OBD-II
P26C4
Clutch-pedal supervision can identify a channel or a disagreement
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Generic OBD-II
P26C5
An exhaust-valve open report is different from a stuck-valve result
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Generic OBD-II
P26C6
A low exhaust-valve circuit report must retain the bank1 identity
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Generic OBD-II
P26C7
A high exhaust-valve circuit is separate from a stuck position
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Generic OBD-II
P26C8
a received warning request points to another controller’s findings
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Generic OBD-II
P26C9
Chassis Control Module 2 Requested MIL Illumination
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Generic OBD-II
P26CA
Engine Coolant Pump Control Circuit/Open
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Generic OBD-II
P26CB
Engine Coolant Pump Performance/Stuck Off
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Generic OBD-II
P26CC
Engine Coolant Pump Control Circuit Low
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Generic OBD-II
P26CD
Engine Coolant Pump Control Circuit High
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Generic OBD-II
P26CE
Pump overspeed is a filtered mismatch, not proof of trapped air
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Generic OBD-II
P26CF
Engine Coolant Pump Control Module System Voltage
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Generic OBD-II
P26D0
Engine Coolant Pump Control Module System Voltage Low
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Generic OBD-II
P26D1
Engine Coolant Pump Control Module System Voltage High
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Generic OBD-II
P26D2
Engine Coolant Pump Control Module Over Temperature
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Generic OBD-II
P26D3
Engine Coolant Pump Supply Voltage Circuit
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Generic OBD-II
P26D4
Engine Coolant Pump Supply Voltage Circuit Low
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Generic OBD-II
P26D5
Engine Coolant Pump Supply Voltage Circuit High
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Generic OBD-II
P26D6
Engine Coolant Pump Clutch Control Circuit/Open
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Generic OBD-II
P26D7
Engine Coolant Pump Clutch Performance/Stuck Off
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Generic OBD-II
P26D8
Engine Coolant Pump Clutch Stuck On
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Generic OBD-II
P26D9
Engine Coolant Pump Clutch Control Circuit Low
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Generic OBD-II
P26DA
Engine Coolant Pump Clutch Control Circuit High
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Generic OBD-II
P26DB
Engine Sound Control A Circuit/Open
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Generic OBD-II
P26DC
Engine Sound Control A Circuit Low
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Generic OBD-II
P26DD
Engine Sound Control A Circuit High
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Generic OBD-II
P26DE
Engine Sound Control A Circuit Performance
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Generic OBD-II
P26DF
Sensor Power Supply D Circuit/Open
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Generic OBD-II
P26E0
Sensor Power Supply D Circuit Low
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Generic OBD-II
P26E1
Sensor Power Supply D Circuit High
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Generic OBD-II
P26E2
Fuel Mode Indicator Lamp Control Circuit Low
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Generic OBD-II
P26E3
Fuel Mode Indicator Lamp Control Circuit High
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Generic OBD-II
P26E4
Starter pinion-relay open circuit is checked with power commanded on
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Generic OBD-II
P26E5
Low pinion-relay feedback uses its own starting-voltage boundary
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Generic OBD-II
P26E6
An off-state starter-relay signal remains powered
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Generic OBD-II
P26E7
Supply D open-load may be discovered only when shutting down
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Generic OBD-II
P26E8
Supply D circuit low includes a high-current failure branch
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Generic OBD-II
P26E9
Supply D high describes an HSO8 shutdown-state failure
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Generic OBD-II
P26EA
Pump B internal-error feedback is not lost communication
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Generic OBD-II
P26EB
Alternative Fuel Control Module System Voltage
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Generic OBD-II
P26EC
Engine Sound Control B Circuit/Open
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Generic OBD-II
P26ED
Engine Sound Control B Circuit Low
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Generic OBD-II
P26EE
Engine Sound Control B Circuit High
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Generic OBD-II
P26EF
Engine Sound Control B Circuit Performance
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Generic OBD-II
P26F0
Starter Relay A Stuck On
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Generic OBD-II
P26F1
Starter Relay A Stuck Off
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Generic OBD-II
P26F2
Starter Relay B Stuck On
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Generic OBD-II
P26F3
Starter Relay B Stuck Off
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Generic OBD-II
P26F4
Coolant Pump C Control Circuit/Open
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Generic OBD-II
P26F5
Coolant Pump C Control Circuit Low
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Generic OBD-II
P26F6
Coolant Pump C Control Circuit High
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Generic OBD-II
P26F7
Coolant Pump C Supply Voltage Circuit
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Generic OBD-II
P26F8
Coolant Pump C Stuck/Stalled
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Generic OBD-II
P26F9
Coolant Pump C Control Module Overtemperature
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Generic OBD-II
P26FA
Coolant pump C exceeds an absolute speed limit
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Generic OBD-II
P26FB
EGR bypass stuck closed: restricted vacuum supply versus valve damage
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Generic OBD-II
P26FC
EGR Cooler Bypass Control Stuck Closed Bank 2
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Generic OBD-II
P26FD
A/C Compressor Internal Control Module Performance
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Generic OBD-II
P26FE
Exhaust-valve performance includes position and reported-state evidence
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Generic OBD-II
P26FF
Auto Configuration Throttle Input Not Present Bank 2
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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.