Diagnostic comparisons

Diagnostic knowledge search

23,879 code identifiers with scoped meanings, and 54,261 enhanced signal definitions. No VIN or personal information is needed.

Diagnostic explainers

Pending, stored and permanent codes · Enhanced PIDs and Mode 22

Code or signal meaning

Reference

Brand context

78,140 matches

Page 683 · 20461–20490 shown

P1850

Transmission Transfer Case Contact Plate "B" Circuit Failure

12 reference families · Chrysler, Ford, GM, Lincoln, Mercury, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Oldsmobile, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P1851

Transmission Transfer Case Contact Plate "B" Open Circuit

8 reference families · Ford, GM, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P1852

Transmission Transfer Case Contact Plate "B" Short Circuit To Battery

8 reference families · Ford, GM, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P1853

Transmission Transfer Case Contact Plate "B" Short Circuit To Ground

8 reference families · Ford, GM, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P1854

Transmission Transfer Case Contact Plate "C" Circuit Failure

11 reference families · Chrysler, Ford, Lincoln, Mercury, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Oldsmobile, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P1855

Transmission Transfer Case Contact Plate "C" Open Circuit

7 reference families · Ford, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P1856

Transmission Transfer Case Contact Plate "C" Short Circuit To Battery

7 reference families · Ford, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P1857

Transmission Transfer Case Contact Plate "C" Short Circuit To Ground

8 reference families · Ford, GM, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P1858

Transmission Transfer Case Contact Plate "D" Circuit Failure

P1859

Transmission Transfer Case Contact Plate "D" Open Circuit

7 reference families · Ford, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P185A

DIFFERENTIAL LOCK-UP INPUT SWITCH CIRCUIT HIGH

1 reference families · Generic OBD2

P185B

DIFFERENTIAL LOCK-UP INDICATOR CIRCUIT LOW

1 reference families · Generic OBD2

P185C

DIFFERENTIAL LOCK-UP INDICATOR CIRCUIT HIGH

1 reference families · Generic OBD2

P185D

DIFFERENTIAL LOCK-UP CONTROL CIRCUIT PERFORMANCE

1 reference families · Generic OBD2

P185F

Transfer case control - shift position signal inconsistent with operating conditions indicated by other sensor inputs

1 reference families · ISUZU

P1860

TCC PWM Solenoid Circuit Electrical/ Transmission Transfer Case Contact Plate "D" Short Circuit To Battery

8 reference families · Ford, GM, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P1861

Transmission Transfer Case Contact Plate "D" Short Circuit To Ground

7 reference families · Ford, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P1862

Transmission Transfer Case Contact Plate Power Circuit Failure

8 reference families · Ford, GM, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P1863

Transmission Transfer Case Contact Plate Power Open Circuit

8 reference families · Ford, GM, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P1864

Transmission Transfer Case Contact Plate Power Short To Battery

8 reference families · Ford, GM, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P1865

Transmission Transfer Case Contact Plate Power Short To Ground

8 reference families · Ford, GM, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen, Polestar / Volvo

P1866

Transmission Transfer Case System Concern - Servicing Required

P1867

Transmission Transfer Case Contact Plate General Circuit Failure

10 reference families · Chrysler, Ford, GM, Lincoln, Mercury, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Oldsmobile, Belgee / Geely / Proton

P1868

Transmission Automatic 4-Wheel Drive Indicator (Lamp) Circuit Failure

7 reference families · Ford, GM, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen

P1869

Transmission Automatic 4-Wheel Drive Indicator (Lamp) Circuit Short To Battery

5 reference families · Ford, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton

P186D

CLUTCH ACTUATOR STUCK

1 reference families · Ford

P186E

DIFFERENTIAL OIL FILTER LEAKAGE

1 reference families · Ford

P186F

DIFFERENTIAL CONTROL MODULE - SOFTWARE INCOMPATIBILITY

1 reference families · Ford

P1870

Transmission Component Slipping/ Transmission Mechanical Transfer Case 4x4 Switch Circuit Failure

8 reference families · Ford, GM, Acura / Honda, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen

P1871

Transmission Mechanical Transfer Case 4x4 Switch Circuit Short to Battery

7 reference families · Ford, GM, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Audi / Jetta / MAN / Seat / Skoda / Volkswagen

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OBD Lens reference library · catalog legacy-owner-2026-11-02-v84-evidence. Sources and scope