P CODE FAMILY
Powertrain code references — Page 62.
Engine, transmission and powertrain diagnostic references. Exact vehicle and module context still matters.
Volkswagen
P1795
Vehicle Speed Signal Circuit Open
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Jaguar
P1796
Jaguar 5 HP 24 CAN circuit malfunction
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Mazda / Nissan
P1796
Kick Down Switch Circuit
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Volkswagen
P1796
Vehicle Speed Signal Short To Ground
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Jaguar
P1797
Jaguar transmission missing the ECM CAN message
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Kia
P1797
Clutch Pedal Switch MT Or P/N Switch Circuit Fault
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Mazda / Nissan
P1797
P/N Switch Open Or Short Circuit
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Volkswagen
P1797
Vehicle Speed Signal Short To B+
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Jaguar
P1798
Jaguar transmission missing the instrument-pack CAN message
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Mazda / Nissan
P1798
Coolant Temperature Circuit
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Volkswagen
P1798
Output Speed Sensor 2 Circuit Range Performance
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Mazda / Nissan
P1799
Hold Switch Circuit
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Volkswagen
P1799
Output Speed Sensor 2 Circuit RPM Too High
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Buick / Cadillac +4
P1800
TCM Power Control Relay Circuit Open
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Buick / Cadillac +4
P1801
Performance Selector Switch Failure
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Buick / Cadillac +4
P1804
Ground Control Relay
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Ford / Lincoln +1
P1804
Transmission 4-Wheel Drive High Indicator Circuit Failure
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Ford / Lincoln +1
P1806
Transmission 4-Wheel Drive High Indicator Short Circuit To Battery
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Ford / Lincoln +1
P1808
Transmission 4-Wheel Drive Low Indicator Circuit Failure
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Buick / Cadillac +4
P1810
Pressure-switch states conflict with operating conditions
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Ford / Lincoln +1
P1810
TFP Valve Position Switch Circuit Transmission 4-Wheel Drive Low Indicator Short Circuit To Battery
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Buick / Cadillac +4
P1811
Shift duration remains long at maximum adaptation
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Buick / Cadillac +4
P1812
Transmission Over Temperature Condition
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Ford / Lincoln +1
P1812
Transmission 4-Wheel Drive Mode Select Circuit Failure
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Buick / Cadillac +4
P1813
Torque Control
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Volkswagen
P1813
Pressure Control Solenoid 1 Electrical
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Buick / Cadillac +4
P1814
Torque Converter Overstressed
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Volkswagen
P1814
Volkswagen pressure valve 1 open or grounded: N215 and N91 naming
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Buick / Cadillac +4
P1815
Transmission Range Switch Start In Wrong Range
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Ford / Lincoln +1
P1815
Transmission 4-Wheel Drive Mode Select Short Circuit To Ground
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Volkswagen
P1815
Volkswagen pressure valve 1 short to positive and the 01V connector
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Buick / Cadillac +4
P1816
Park/neutral indication conflicts with a driven ratio
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Buick / Cadillac +4
P1817
Reverse indication conflicts with forward drive
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Buick / Cadillac +4
P1818
Forward-range switch indication conflicts with reverse ratio
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Volkswagen
P1818
Pressure Control Solenoid 2 Electrical
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Buick / Saturn
P1819
Internal Mode Swtich No Start, Wrong Range
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Cadillac / Chevrolet +2
P1819
Internal Mode Switch No Start Wrong Range
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Ford / Lincoln +1
P1819
Transmission Neutral Safety Switch Short Circuit To Ground
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Volkswagen
P1819
Volkswagen pressure valve 2 open or grounded: confirm N216/N92 mapping
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Buick / Cadillac +4
P1820
Internal Mode Switch Circuit A Low
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Ford / Lincoln +1
P1820
Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure
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Volkswagen
P1820
Volkswagen pressure valve 2 short to supply and connector condition
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Buick / Cadillac +4
P1822
Internal-mode-switch B remains high when low is expected
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Ford / Lincoln +1
P1822
Transmission Transfer Case Clockwise Shift Relay Coil Short Circuit To Battery
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Buick / Cadillac +4
P1823
Internal-mode-switch P remains low when high is expected
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Volkswagen
P1823
Pressure Control Solenoid 3 Electrical
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Ford / Lincoln +1
P1824
Transmission 4-Wheel Drive Clutch Relay Circuit Failure
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Volkswagen
P1824
Volkswagen pressure valve 3 open or short to ground
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Buick / Cadillac +4
P1825
Internal Mode Switch Illegal Range
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Volkswagen
P1825
Volkswagen pressure valve 3 short-to-positive fault
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Buick / Cadillac +4
P1826
Internal Mode Switch Circuit C High
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Ford / Lincoln +1
P1826
Transmission 4-Wheel Drive Low Clutch Relay Circuit To Battery
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Ford / Lincoln +1
P1828
Transmission Transfer Case Counter Clockwise Shift Relay Coil Circuit Failure
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Volkswagen
P1828
Pressure Control Solenoid 4 Electrical
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Volkswagen
P1829
Volkswagen pressure valve 4 fault and the DSG mechatronic naming caveat
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Ford / Lincoln +1
P1830
Transmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To Battery
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Chrysler / Dodge +3
P1830
Open Or Shorted Condition Detected In The Clutch Pedal Switch Over-Ride Relay Control
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Volkswagen
P1830
Volkswagen pressure valve 4 short to supply: N218 and N94 context
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Buick / Cadillac +4
P1831
Transmission high-side driver 1 fails its on-state check
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Ford / Lincoln +1
P1832
Transmission Transfer Case Differential Lock-Up Solenoid Circuit Failure
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Buick / Cadillac +4
P1833
Transmission high-side driver 2 cannot sustain its command
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Ford / Lincoln +1
P1834
Transmission Transfer Case Differential Lock-Up Solenoid Short Circuit To Battery
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Volkswagen
P1834
Pressure Control Solenoid 5 Open Short To Ground
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Buick / Cadillac +4
P1835
Kick-Down Switch
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Volkswagen
P1835
Pressure Control Solenoid 5 Short To B+
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Buick / Cadillac +4
P1836
Kick-Down Switch Failed Open
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Buick / Cadillac +4
P1837
Kick-Down Switch Failed Short
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Ford / Lincoln +1
P1838
Transmission Transfer Case Shift Motor Circuit Failure
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Volkswagen
P1841
engine and transmission controller compatibility matters
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Buick / Cadillac +4
P1842
Shift-solenoid A control circuit open or held low
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Volkswagen
P1842
Check DTC Memory Of Instrument Panel ECU
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Buick / Cadillac +4
P1843
Shift-solenoid A control circuit held toward supply
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Volkswagen
P1843
Check DTC Memory Of Distance Control ECU
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Buick / Cadillac +4
P1844
Torque Reduction Signal Circuit Desired By TCM
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Volkswagen
P1844
Check DTC Memory Of Central Electronic Control ECU
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Buick / Cadillac +4
P1845
Transmission Gear Ratio Output Circuit
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Ford / Lincoln +1
P1846
Transmission Transfer Case Contact Plate A Circuit Failure
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Buick / Cadillac +4
P1847
2-3 Shift Solenoid Circuit High Voltage
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Volkswagen
P1847
Volkswagen ABS fault-memory referral and cross-module effects
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Volkswagen
P1848
Volkswagen engine-memory referral: diagnose the originating ECU fault
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Volkswagen
P1849
Check DTC Memory Of Transmission ECU
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Buick / Cadillac +4
P1850
Brake Band Apply Solenoid Circuit
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Ford / Lincoln +1
P1850
Transmission Transfer Case Contact Plate B Circuit Failure
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Volkswagen
P1850
Volkswagen missing engine-controller message and the replacement caution
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Buick / Cadillac +4
P1851
Brake Band Apply Solenoid Performance
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Volkswagen
P1851
The transmission misses an ABS control-module message
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Buick / Cadillac +4
P1852
Brake Band Apply Solenoid Low Voltage
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Volkswagen
P1852
CAN Bus Unplausible Message From Engine Control
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Buick / Cadillac +4
P1853
Brake Band Apply Solenoid High Voltage
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Volkswagen
P1853
Volkswagen implausible ABS message and the DSG communication-partner list
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Ford / Lincoln +1
P1854
Transmission Transfer Case Contact Plate C Circuit Failure
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Volkswagen
P1854
A hardware fault disrupts the powertrain data bus
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Volkswagen
P1855
The powertrain controllers fail a software-version compatibility check
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Volkswagen
P1856
Passat transmission receiving a G69 throttle fault message
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Volkswagen
P1857
the load-signal error sends diagnosis back to the engine ECU
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Ford / Lincoln +1
P1858
Transmission Transfer Case Contact Plate D Circuit Failure
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Volkswagen
P1858
The transmission receives an engine-speed fault message
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Volkswagen
P1859
Brake Switch Circuit Error Message From Engine Control
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Buick / Cadillac +4
P1860
Torque-converter PWM control circuit electrical fault
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Volkswagen
P1860
Kick Down Switch Error Message From Engine Control
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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.