P CODE FAMILY
Powertrain code references — Page 78.
Engine, transmission and powertrain diagnostic references. Exact vehicle and module context still matters.
Generic OBD-II
P25B3
Why wastegate A stuck-open depends on position normalization
PowertrainRead article
Generic OBD-II
P25B4
Wastegate A stuck-closed is a timed control disagreement
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Generic OBD-II
P25B5
Reading bank-two wastegate stuck-open without reversing the scale
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Generic OBD-II
P25B6
How the controller classifies a bank-two wastegate closed-side jam
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Generic OBD-II
P25B7
Auxiliary Ignition Switch On/Start Position Circuit
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Generic OBD-II
P25B8
Auxiliary Ignition Switch On/Start Position Circuit Low
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Generic OBD-II
P25B9
Auxiliary Ignition Switch On/Start Position Circuit High
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Generic OBD-II
P25BA
Regeneration Control Switch Circuit/Open
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Generic OBD-II
P25BB
Regeneration Control Switch Circuit Low
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Generic OBD-II
P25BC
Regeneration Control Switch Circuit High
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Generic OBD-II
P25BD
engine overspeed detected without commanded fuel delivery
PowertrainRead article
Generic OBD-II
P25BE
Alternative Fuel Disable Control Circuit/Open
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Generic OBD-II
P25BF
Alternative Fuel Disable Control Circuit High
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Generic OBD-II
P25C0
Alternative Fuel Disable Control Circuit Low
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Generic OBD-II
P25C1
Alternative Fuel Disable Signal Circuit
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Generic OBD-II
P25C2
Alternative Fuel Disable Signal Circuit High
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Generic OBD-II
P25C3
Alternative Fuel Disable Signal Circuit Low
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Generic OBD-II
P25C4
Brake Booster Temperature Sensor A Circuit
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Generic OBD-II
P25C5
Brake-unit internal temperature sensor low-voltage subcode
PowertrainRead article
Generic OBD-II
P25C6
Brake-booster temperature low is an electrical channel-one finding
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Generic OBD-II
P25C7
A high booster temperature input does not prove overheating
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Generic OBD-II
P25C8
Brake Booster Temperature Sensor A Circuit Intermittent/Erratic
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Generic OBD-II
P25C9
The brake controller has requested an emissions warning
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Generic OBD-II
P25CA
bank-one cam lock-pin open-circuit feedback needs command context
PowertrainRead article
Generic OBD-II
P25CB
bank-one cam lock-pin short-to-ground is an electrical branch
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Generic OBD-II
P25CC
Intake camshaft park-lock driver remains high when switched on
PowertrainRead article
Generic OBD-II
P25CD
Bank 2 camshaft park-lock circuit is classified open
PowertrainRead article
Generic OBD-II
P25CE
Bank 2 camshaft park-lock circuit reads low with the driver off
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Generic OBD-II
P25CF
bank-two cam lock-pin feedback stays high when commanded on
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Generic OBD-II
P25D0
Exhaust Camshaft Actuator Park Lock Control Circuit/Open Bank 1
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Generic OBD-II
P25D1
Exhaust Camshaft Actuator Park Lock Control Circuit Low Bank 1
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Generic OBD-II
P25D2
Exhaust Camshaft Actuator Park Lock Control Circuit High Bank 1
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Generic OBD-II
P25D3
Exhaust Camshaft Actuator Park Lock Control Circuit/Open Bank 2
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Generic OBD-II
P25D4
Exhaust Camshaft Actuator Park Lock Control Circuit Low Bank 2
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Generic OBD-II
P25D5
Exhaust Camshaft Actuator Park Lock Control Circuit High Bank 2
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Generic OBD-II
P25D6
Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Stop Performance
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Generic OBD-II
P25D7
Fuel Level Sensor C Circuit
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Generic OBD-II
P25D8
Fuel Level Sensor C Performance
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Generic OBD-II
P25D9
Fuel Level Sensor C Circuit Low
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Generic OBD-II
P25DA
Fuel Level Sensor C Circuit High
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Generic OBD-II
P25DB
Fuel Level Sensor C Circuit Intermittent
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Generic OBD-II
P25DC
Fuel Level Sensor C Stuck
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Generic OBD-II
P25DD
A Camshaft Position - Stuck In Locked Position Bank 1
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Generic OBD-II
P25DE
A Camshaft Position - Unable to Achieve Locked Position Bank 1
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Generic OBD-II
P25DF
A Camshaft Position Control Performance Bank 1
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Generic OBD-II
P25E0
A Camshaft Position - Stuck In Locked Position Bank 2
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Generic OBD-II
P25E1
A Camshaft Position - Unable to Achieve Locked Position Bank 2
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Generic OBD-II
P25E2
A Camshaft Position Control Performance Bank 2
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Generic OBD-II
P25E3
B Camshaft Position - Stuck In Locked Position Bank 1
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Generic OBD-II
P25E4
B Camshaft Position - Unable to Achieve Locked Position Bank 1
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Generic OBD-II
P25E5
B Camshaft Position Control Performance Bank 1
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Generic OBD-II
P25E6
B Camshaft Position - Stuck In Locked Position Bank 2
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Generic OBD-II
P25E7
B Camshaft Position - Unable to Achieve Locked Position Bank 2
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Generic OBD-II
P25E8
B Camshaft Position Control Performance Bank 2
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Generic OBD-II
P25E9
Supercharger Disconnect Clutch Stuck Open
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Generic OBD-II
P25EA
Supercharger Disconnect Clutch Stuck Closed
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Generic OBD-II
P25EB
Supercharger Disconnect Clutch Circuit Range/Performance
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Generic OBD-II
P25EC
Supercharger clutch control circuit low
PowertrainRead article
Generic OBD-II
P25ED
Supercharger clutch control circuit high
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Generic OBD-II
P25EE
Vacuum Pump Control Circuit B/Open
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Generic OBD-II
P25EF
Vacuum Pump Control Circuit B Range/Performance
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Generic OBD-II
P25F0
Vacuum Pump Control Circuit B Low
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Generic OBD-II
P25F1
Vacuum Pump Control Circuit B High
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Generic OBD-II
P25F2
Turbocharger/Supercharger Boost Sensor C Circuit
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Generic OBD-II
P25F3
Turbocharger/Supercharger Boost Sensor C Circuit Range/Performance
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Generic OBD-II
P25F4
Turbocharger/Supercharger Boost Sensor C Circuit Low
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Generic OBD-II
P25F5
Turbocharger/Supercharger Boost Sensor C Circuit High
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Generic OBD-II
P25F6
AIR System B
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Generic OBD-II
P25F7
AIR System B Incorrect Flow Detected
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Generic OBD-II
P25F8
Turbocharger/Supercharger Bypass Valve C Control Circuit
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Generic OBD-II
P25F9
Turbocharger/Supercharger Bypass Valve C Control Circuit Low
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Generic OBD-II
P25FA
Turbocharger/Supercharger Bypass Valve C Control Circuit High
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Generic OBD-II
P25FB
Turbocharger/Supercharger Bypass Valve C Control Circuit Range/Performance
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Generic OBD-II
P25FC
Turbocharger/Supercharger Bypass Valve C – Mechanical
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Generic OBD-II
P25FD
Turbocharger/Supercharger Bypass Valve C Temperature Too High
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Generic OBD-II
P25FE
Supercharger Disconnect Clutch
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Generic OBD-II
P25FF
Electrical System Voltage Stabilizer Control Module Performance
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Generic OBD-II
P2600
Locate the monitored coolant-pump function before testing an open circuit
PowertrainRead article
Generic OBD-II
P2601
A pump A performance result is not the same as an open circuit
PowertrainRead article
Generic OBD-II
P2602
Low pump-control evidence must be separated from low supply voltage
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Generic OBD-II
P2603
Read a high coolant-pump control fault as driver evidence
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Generic OBD-II
P2604
Intake Air Heater A Circuit Range/Performance
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Generic OBD-II
P2605
Intake Air Heater B Circuit/Open
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Generic OBD-II
P2606
Intake Air Heater B Circuit Range/Performance
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Generic OBD-II
P2607
Intake Air Heater B Circuit Low
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Generic OBD-II
P2608
Intake Air Heater B Circuit High
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Generic OBD-II
P2609
Intake Air Heater System Performance
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Generic OBD-II
P260A
PTO Control Circuit/Open
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Generic OBD-II
P260B
PTO Control Circuit Low
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Generic OBD-II
P260C
PTO Control Circuit High
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Generic OBD-II
P260D
PTO Engaged Lamp Control Circuit
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Generic OBD-II
P260E
Particulate Filter Regeneration Lamp Control Circuit
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Generic OBD-II
P260F
EVAP processor performance is separate from a measured tank leak
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Generic OBD-II
P2610
An unreliable off timer can distort a cold-soak diagnosis
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Generic OBD-II
P2611
A/C Refrigerant Distribution Valve A Control Circuit/Open
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Generic OBD-II
P2612
N280 compressor-valve wiring can explain an inactive air conditioner
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Generic OBD-II
P2613
A/C Refrigerant Distribution Valve A Control Circuit High
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Generic OBD-II
P2614
Ford 6.0L FICM loses camshaft-position synchronization
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Generic OBD-II
P2615
Cam-position output circuit remains low when high is commanded
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Generic OBD-II
P2616
Cam-position output driver reports a short toward supply
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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.