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THE CODE DIRECTORY

Diagnostic code references — Page 68.

Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.

11,786 code references

Volkswagen
P1778

Solenoid EV7 Electrical Malfunction

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Buick / Cadillac +4
P1779

Engine Torque Delivered To TCM Signal

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Ford / Lincoln +1
P1779

Transmission Control Indicator Lamp Circuit Malfunction

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Jaguar
P1779

Load Control

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BMW
P1780

CAN Torque Reduction

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Buick
P1780

Park/Neutral Postion (PNP) Switch Circuit Engine Torque Signal Circuit

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Cadillac / Chevrolet +2
P1780

Park/Neutral Position (PNP) Switch Circuit Engine Torque Signal Circuit

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Ford / Lincoln +1
P1780

Transmission Control Switch Circuit is Out of Self-Test Range

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Lexus
P1780

PNP Switch Malfunction

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Mercedes-Benz
P1780

Modulation Pressure Switchover Valve ATCC Y34 Or Upshift Delay Switchover Valve ATCC Y35

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Mazda / Nissan
P1780

Transmission Control Switch Circuit Overdrive Off Switch Not Cycled During The Self Test

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Oldsmobile
P1780

Park Neutral Position Switch Circuit Engine Torque Signal Circuit

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Toyota
P1780

Park Neutral Position Switch Malfunction Only For A/T

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Volkswagen
P1780

Engine Intervention Readable

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Ford / Lincoln +1
P1781

4x4 Low Switch is Out of Self-Test Range

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Mercedes-Benz
P1781

Upshift Delay Switchover Valve ATCC Y35

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Mazda / Nissan
P1781

Transmission 4x4 Low Switch Out Of Range Fault

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Volkswagen
P1781

Engine Torque Reduction Open Short To Ground

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Ford / Lincoln +1
P1782

P/ES Circuit Out Of Self Test Range

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Volkswagen
P1782

Engine Torque Reduction Short To B+

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Ford / Lincoln +1
P1783

Transmission Over-Temperature Condition

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Mazda / Nissan
P1783

Transmission Fluid Temperature High Input

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Ford / Lincoln +1
P1784

Transmission Mechanical Failure First And Reverse

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Volkswagen
P1784

Shift Up Down Wire Open Short To Ground

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Ford / Lincoln +1
P1785

Transmission Mechanical Failure First And Second

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Volkswagen
P1785

Shift Up Down Wire Short To B+

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Ford / Lincoln +1
P1786

3-2 Downshift Error

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Volkswagen
P1786

Reversing Light Circuit Open

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Ford / Lincoln +1
P1787

2-1 Downshift Error

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Volkswagen
P1787

Reversing Light Circuit Short To Ground

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Ford / Lincoln +1
P1788

Pressure Control Solenoid B Open Circuit

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Acura / Honda
P1788

Automatic Transmission System Malfunction

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Mazda / Nissan
P1788

Pressure Control Solenoid B Circuit Open

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Volkswagen
P1788

Reversing Light Circuit Short To B+

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Ford / Lincoln +1
P1789

Pressure Control Solenoid B Short Circuit

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Jaguar
P1789

Ignition Supply Malfunction

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Mazda / Nissan
P1789

Pressure Control Solenoid B Circuit Shorted

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Volkswagen
P1789

Idle Speed Intervention Circuit Error Message From Engine Control

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Buick / Cadillac +4
P1790

Transmission Control Module Checksum

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Acura / Honda
P1790

TCM A/T TP Sensor Circuit Fault

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Jaguar
P1790

Ignition Supply Malfunction

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Mazda / Nissan
P1790

TP Mechanical Circuit

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Volkswagen
P1790

Transmission Range Display Circuit Open

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Buick / Cadillac +4
P1791

Transmission Control Module Loop

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Acura / Honda
P1791

TCM A/T Vehicle Speed Sensor Circuit Fault

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Jaguar
P1791

Ignition Supply Malfunction

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Mazda / Nissan
P1791

TP Electric Circuit

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Volkswagen
P1791

Transmission Range Display Circuit Short To Ground

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Buick / Cadillac +4
P1792

Transmission Control Module Reprogrammable Memory

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Jaguar
P1792

Ignition Supply Malfunction

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Mazda / Nissan
P1792

Barometer Pressure Circuit

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Volkswagen
P1792

Transmission Range Display Circuit Short To B+

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Buick / Cadillac +4
P1793

Transmission Control Module Stack Overrun

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Acura / Honda
P1793

Automatic Transmission System Malfunction

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Jaguar
P1793

Ignition Supply Malfunction

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Mazda / Nissan
P1793

Intake Air Volume Circuit

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Volkswagen
P1793

Output Speed Sensor 2 Circuit No Signal

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Jaguar
P1794

Battery Voltage Circuit

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Kia
P1794

Battery Or Circuit Failure

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Mazda / Nissan
P1794

Powertrain Control Module Battery Direct Power Circuit

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Buick / Cadillac +4
P1795

CAN Bus Throttle Body Position

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Ford / Lincoln +1
P1795

Idle Switch Circuit Malfunction

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Acura / Honda
P1795

Automatic Transmission System Malfunction

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Jaguar
P1795

Inconsistent CAN Level

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Kia
P1795

4WD Switch Signal Malfunction

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Mitsubishi
P1795

Throttle Position Input Circuit To TCM

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Mazda / Nissan
P1795

Idle Switch Circuit

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Volkswagen
P1795

Vehicle Speed Signal Circuit Open

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Jaguar
P1796

CAN Controller Circuit Bus Off

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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

CAN TCM ECM Circuit Malfunction

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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

CAN TCM INST Circuit Malfunction

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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

TFP Valve Position Switch Circuit

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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

Maximum Adapt And Long Shift

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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

Pressure Control Solenoid 1 Open Short To Ground

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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

Pressure Control Solenoid 1 Short To B+

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Buick / Cadillac +4
P1816

TFP Valve Position Switch Park/Neutral With Drive Ratio

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Buick / Cadillac +4
P1817

TFP Valve Position Switch Reverse With Drive Ratio

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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.