OBD-II · CODE FAMILY
Codes P18xx — what they mean
P18xx is a family of 95 manufacturer-specific OBD2 codes covering powertrain and electrical faults. Each P18xx code below links to its own page with causes, diagnosis and the parts to fix it.
95 codesPowertrain systems
FAMILY
RangeP1800–P1899
Codes95
TROUBLEATLAS APP
01All codes in this family
One rich, indexed page — not thousands of empty ones. Each code links to its own page.
| Code | Meaning — click to open the code page | System | Severity |
|---|---|---|---|
| P1800 | TCM Power Control Relay Circuit Open → /auto/codes/p1800/ TCM Power Control Relay Circuit Open | Powertrain | Medium |
| P1801 | Performance Selector Switch Failure → /auto/codes/p1801/ Performance Selector Switch Failure | Powertrain | Medium |
| P1802 | Transmission Clutch Interlock Safety Switch Short Circuit To → /auto/codes/p1802/ Transmission Clutch Interlock Safety Switch Short Circuit To Battery | Powertrain | Medium |
| P1803 | Transmission Clutch Interlock Safety Switch Short Circuit To → /auto/codes/p1803/ Transmission Clutch Interlock Safety Switch Short Circuit To Ground | Powertrain | Medium |
| P1804 | Ground Control Relay → /auto/codes/p1804/ Ground Control Relay | Powertrain | Medium |
| P1805 | Transmission 4-Wheel Drive High Indicator Open Circuit → /auto/codes/p1805/ Transmission 4-Wheel Drive High Indicator Open Circuit | Powertrain | Medium |
| P1806 | Transmission 4-Wheel Drive High Indicator Short Circuit To B → /auto/codes/p1806/ Transmission 4-Wheel Drive High Indicator Short Circuit To Battery | Powertrain | Medium |
| P1807 | Transmission 4-Wheel Drive High Indicator Short Circuit To G → /auto/codes/p1807/ Transmission 4-Wheel Drive High Indicator Short Circuit To Ground | Powertrain | Medium |
| P1808 | Transmission 4-Wheel Drive Low Indicator Circuit Failure → /auto/codes/p1808/ Transmission 4-Wheel Drive Low Indicator Circuit Failure | Powertrain | Medium |
| P1809 | Transmission 4-Wheel Drive Low Indicator Open Circuit → /auto/codes/p1809/ Transmission 4-Wheel Drive Low Indicator Open Circuit | Powertrain | Medium |
| P1810 | TFP Valve Position Switch Circuit → /auto/codes/p1810/ TFP Valve Position Switch Circuit | Powertrain | Medium |
| P1811 | Maximum Adapt And Long Shift → /auto/codes/p1811/ Maximum Adapt And Long Shift | Powertrain | Medium |
| P1812 | Transmission Over Temperature Condition → /auto/codes/p1812/ Transmission Over Temperature Condition | Powertrain | Medium |
| P1813 | Torque Control → /auto/codes/p1813/ Torque Control | Powertrain | Medium |
| P1814 | Torque Converter Overstressed → /auto/codes/p1814/ Torque Converter Overstressed | Powertrain | Medium |
| P1815 | Transmission Range Switch Start In Wrong Range → /auto/codes/p1815/ Transmission Range Switch Start In Wrong Range | Powertrain | Medium |
| P1816 | TFP Valve Position Switch Park/Neutral With Drive Ratio → /auto/codes/p1816/ TFP Valve Position Switch Park/Neutral With Drive Ratio | Powertrain | Medium |
| P1817 | TFP Valve Position Switch Reverse With Drive Ratio → /auto/codes/p1817/ TFP Valve Position Switch Reverse With Drive Ratio | Powertrain | Medium |
| P1818 | TFP Valve Position Switch Drive Without Drive Ratio → /auto/codes/p1818/ TFP Valve Position Switch Drive Without Drive Ratio | Powertrain | Medium |
| P1819 | Internal Mode Swtich No Start, Wrong Range → /auto/codes/p1819/ Internal Mode Swtich No Start, Wrong Range | Powertrain | Medium |
| P1820 | Internal Mode Switch Circuit A Low → /auto/codes/p1820/ Internal Mode Switch Circuit A Low | Powertrain | Medium |
| P1821 | Transmission Transfer Case Clockwise Shift Relay Coil Open C → /auto/codes/p1821/ Transmission Transfer Case Clockwise Shift Relay Coil Open Circuit | Powertrain | Medium |
| P1822 | Internal Mode Switch Circuit B High → /auto/codes/p1822/ Internal Mode Switch Circuit B High | Powertrain | Medium |
| P1823 | Internal Mode Switch Circuit P Low → /auto/codes/p1823/ Internal Mode Switch Circuit P Low | Powertrain | Medium |
| P1824 | Transmission 4-Wheel Drive Clutch Relay Circuit Failure → /auto/codes/p1824/ Transmission 4-Wheel Drive Clutch Relay Circuit Failure | Powertrain | Medium |
| P1825 | Internal Mode Switch Illegal Range → /auto/codes/p1825/ Internal Mode Switch Illegal Range | Powertrain | Medium |
| P1826 | Internal Mode Switch Circuit C High → /auto/codes/p1826/ Internal Mode Switch Circuit C High | Powertrain | Medium |
| P1827 | Transmission 4-Wheel Drive Low Clutch Relay Circuit To Groun → /auto/codes/p1827/ Transmission 4-Wheel Drive Low Clutch Relay Circuit To Ground | Powertrain | Medium |
| P1828 | Transmission Transfer Case Counter Clockwise Shift Relay Coi → /auto/codes/p1828/ Transmission Transfer Case Counter Clockwise Shift Relay Coil Circuit Failure | Powertrain | Medium |
| P1829 | Transmission Transfer Case Counter Clockwise Shift Relay Coi → /auto/codes/p1829/ Transmission Transfer Case Counter Clockwise Shift Relay Coil Open Circuit | Powertrain | Medium |
| P1830 | Open Or Shorted Condition Detected In The Clutch Pedal Switc → /auto/codes/p1830/ Open Or Shorted Condition Detected In The Clutch Pedal Switch Override Relay Control | Powertrain | Medium |
| P1831 | PC Solenoid Power Circuit Low Voltage → /auto/codes/p1831/ PC Solenoid Power Circuit Low Voltage | Powertrain | Medium |
| P1832 | Transmission Transfer Case Differential Lock-Up Solenoid Cir → /auto/codes/p1832/ Transmission Transfer Case Differential Lock-Up Solenoid Circuit Failure | Powertrain | Medium |
| P1833 | A/T Solenoids Power Circuit Low Voltage → /auto/codes/p1833/ A/T Solenoids Power Circuit Low Voltage | Powertrain | Medium |
| P1834 | Transmission Transfer Case Differential Lock-Up Solenoid Sho → /auto/codes/p1834/ Transmission Transfer Case Differential Lock-Up Solenoid Short Circuit To Battery | Powertrain | Medium |
| P1835 | Kick-Down Switch → /auto/codes/p1835/ Kick-Down Switch | Powertrain | Medium |
| P1836 | Kick-Down Switch Failed Open → /auto/codes/p1836/ Kick-Down Switch Failed Open | Powertrain | Medium |
| P1837 | Kick-Down Switch Failed Short → /auto/codes/p1837/ Kick-Down Switch Failed Short | Powertrain | Medium |
| P1838 | Transmission Transfer Case Shift Motor Circuit Failure → /auto/codes/p1838/ Transmission Transfer Case Shift Motor Circuit Failure | Powertrain | Medium |
| P1839 | Transmission Transfer Case Shift Motor Open Circuit → /auto/codes/p1839/ Transmission Transfer Case Shift Motor Open Circuit | Powertrain | Medium |
| P1840 | Transmission Transfer Case Shift Motor Short Circuit To Batt → /auto/codes/p1840/ Transmission Transfer Case Shift Motor Short Circuit To Battery | Powertrain | Medium |
| P1841 | Transmission Transfer Case Shift Motor Short Circuit To Grou → /auto/codes/p1841/ Transmission Transfer Case Shift Motor Short Circuit To Ground | Powertrain | Medium |
| P1842 | 1-2 Shift Solenoid Circuit Low Voltage → /auto/codes/p1842/ 1-2 Shift Solenoid Circuit Low Voltage | Powertrain | Medium |
| P1843 | 1-2 Shift Solenoid Circuit High Voltage → /auto/codes/p1843/ 1-2 Shift Solenoid Circuit High Voltage | Powertrain | Medium |
| P1844 | Torque Reduction Signal Circuit Desired By TCM → /auto/codes/p1844/ Torque Reduction Signal Circuit Desired By TCM | Powertrain | Medium |
| P1845 | Transmission Gear Ratio Output Circuit → /auto/codes/p1845/ Transmission Gear Ratio Output Circuit | Powertrain | Medium |
| P1846 | Transmission Transfer Case Contact Plate A Circuit Failure → /auto/codes/p1846/ Transmission Transfer Case Contact Plate A Circuit Failure | Powertrain | Medium |
| P1847 | 2-3 Shift Solenoid Circuit High Voltage → /auto/codes/p1847/ 2-3 Shift Solenoid Circuit High Voltage | Powertrain | Medium |
| P1848 | Transmission Transfer Case Contact Plate 'A' Short Circuit T → /auto/codes/p1848/ Transmission Transfer Case Contact Plate 'A' Short Circuit To Battery | Powertrain | Medium |
| P1849 | Transmission Transfer Case Contact Plate 'A' Short Circuit T → /auto/codes/p1849/ Transmission Transfer Case Contact Plate 'A' Short Circuit To Ground | Powertrain | Medium |
| P1850 | Brake Band Apply Solenoid Circuit → /auto/codes/p1850/ Brake Band Apply Solenoid Circuit | Powertrain | Medium |
| P1851 | Brake Band Apply Solenoid Performance → /auto/codes/p1851/ Brake Band Apply Solenoid Performance | Powertrain | Medium |
| P1852 | Brake Band Apply Solenoid Low Voltage → /auto/codes/p1852/ Brake Band Apply Solenoid Low Voltage | Powertrain | Medium |
| P1853 | Brake Band Apply Solenoid High Voltage → /auto/codes/p1853/ Brake Band Apply Solenoid High Voltage | Powertrain | Medium |
| P1854 | Transmission Transfer Case Contact Plate C Circuit Failure → /auto/codes/p1854/ Transmission Transfer Case Contact Plate C Circuit Failure | Powertrain | Medium |
| P1855 | Transmission Transfer Case Contact Plate 'C' Open Circuit → /auto/codes/p1855/ Transmission Transfer Case Contact Plate 'C' Open Circuit | Powertrain | Medium |
| P1856 | Transmission Transfer Case Contact Plate 'C' Short Circuit T → /auto/codes/p1856/ Transmission Transfer Case Contact Plate 'C' Short Circuit To Battery | Powertrain | Medium |
| P1857 | Transmission Transfer Case Contact Plate 'C' Short Circuit T → /auto/codes/p1857/ Transmission Transfer Case Contact Plate 'C' Short Circuit To Ground | Powertrain | Medium |
| P1858 | Transmission Transfer Case Contact Plate D Circuit Failure → /auto/codes/p1858/ Transmission Transfer Case Contact Plate D Circuit Failure | Powertrain | Medium |
| P1859 | Transmission Transfer Case Contact Plate 'D' Open Circuit → /auto/codes/p1859/ Transmission Transfer Case Contact Plate 'D' Open Circuit | Powertrain | Medium |
| P1860 | TCC PWM Solenoid Circuit Electrical → /auto/codes/p1860/ TCC PWM Solenoid Circuit Electrical | Powertrain | Medium |
| P1861 | Transmission Transfer Case Contact Plate 'D' Short Circuit T → /auto/codes/p1861/ Transmission Transfer Case Contact Plate 'D' Short Circuit To Ground | Powertrain | Medium |
| P1862 | Transmission Transfer Case Contact Plate Power Circuit Failu → /auto/codes/p1862/ Transmission Transfer Case Contact Plate Power Circuit Failure | Powertrain | Medium |
| P1863 | Transmission Transfer Case Contact Plate Power Open Circuit → /auto/codes/p1863/ Transmission Transfer Case Contact Plate Power Open Circuit | Powertrain | Medium |
| P1864 | Torque Converter Clutch Circuit → /auto/codes/p1864/ Torque Converter Clutch Circuit | Powertrain | Medium |
| P1865 | Transmission Transfer Case Contact Plate Power Short To Grou → /auto/codes/p1865/ Transmission Transfer Case Contact Plate Power Short To Ground | Powertrain | Medium |
| P1866 | Transmission Transfer Case System Concern Servicing Required → /auto/codes/p1866/ Transmission Transfer Case System Concern Servicing Required | Powertrain | Medium |
| P1867 | Transmission Transfer Case Contact Plate General Circuit Fai → /auto/codes/p1867/ Transmission Transfer Case Contact Plate General Circuit Failure | Powertrain | Medium |
| P1868 | Transmission Fluid Life → /auto/codes/p1868/ Transmission Fluid Life | Powertrain | Medium |
| P1869 | Transmission Automatic 4-Wheel Drive Indicator (Lamp) Circui → /auto/codes/p1869/ Transmission Automatic 4-Wheel Drive Indicator (Lamp) Circuit Short To Battery | Powertrain | Medium |
| P1870 | Transmission Component Slipping → /auto/codes/p1870/ Transmission Component Slipping | Powertrain | Medium |
| P1871 | Undefined Gear Ratio → /auto/codes/p1871/ Undefined Gear Ratio | Powertrain | Medium |
| P1872 | Transmission Mechanical 4-Wheel Drive Axle Lock Lamp Circuit → /auto/codes/p1872/ Transmission Mechanical 4-Wheel Drive Axle Lock Lamp Circuit Failure | Powertrain | Medium |
| P1873 | TCC Stator Temp. Switch Circuit Low → /auto/codes/p1873/ TCC Stator Temp. Switch Circuit Low | Powertrain | Medium |
| P1874 | TCC Stator Temp. Switch Circuit High → /auto/codes/p1874/ TCC Stator Temp. Switch Circuit High | Powertrain | Medium |
| P1875 | 4WD Low Switch Circuit → /auto/codes/p1875/ 4WD Low Switch Circuit | Powertrain | Medium |
| P1876 | Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Fa → /auto/codes/p1876/ Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Failure | Powertrain | Medium |
| P1877 | Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Sh → /auto/codes/p1877/ Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Short To Battery | Powertrain | Medium |
| P1878 | Transmission Transfer Case Disengaged Solenoid Circuit Failu → /auto/codes/p1878/ Transmission Transfer Case Disengaged Solenoid Circuit Failure | Powertrain | Medium |
| P1879 | Transmission Transfer Case Disengaged Solenoid Open Circuit → /auto/codes/p1879/ Transmission Transfer Case Disengaged Solenoid Open Circuit | Powertrain | Medium |
| P1880 | Transmission Transfer Case Disengaged Solenoid Short to Batt → /auto/codes/p1880/ Transmission Transfer Case Disengaged Solenoid Short to Battery | Powertrain | Medium |
| P1881 | Engine Coolant Level Switch Circuit Failure GEM → /auto/codes/p1881/ Engine Coolant Level Switch Circuit Failure GEM | Powertrain | Medium |
| P1882 | Engine Coolant Level Switch Circuit Short to Ground → /auto/codes/p1882/ Engine Coolant Level Switch Circuit Short to Ground | Powertrain | Medium |
| P1883 | Engine Coolant Level Switch Circuit Failure GEM → /auto/codes/p1883/ Engine Coolant Level Switch Circuit Failure GEM | Powertrain | Medium |
| P1884 | TCC Enable/Shift Light Circuit → /auto/codes/p1884/ TCC Enable/Shift Light Circuit | Powertrain | Medium |
| P1885 | Transmission Transfer Case Disengaged Solenoid Short to Grou → /auto/codes/p1885/ Transmission Transfer Case Disengaged Solenoid Short to Ground | Powertrain | Medium |
| P1886 | Shift Timing Solenoid → /auto/codes/p1886/ Shift Timing Solenoid | Powertrain | Medium |
| P1887 | TCC Release Switch Circuit → /auto/codes/p1887/ TCC Release Switch Circuit | Powertrain | Medium |
| P1890 | ECM Data Input Circuit → /auto/codes/p1890/ ECM Data Input Circuit | Powertrain | Medium |
| P1891 | Throttle Position Sensor PWM Signal Low → /auto/codes/p1891/ Throttle Position Sensor PWM Signal Low | Powertrain | Medium |
| P1892 | Throttle Position Sensor PWM Signal High → /auto/codes/p1892/ Throttle Position Sensor PWM Signal High | Powertrain | Medium |
| P1893 | Engine Torque Signal Low Voltage → /auto/codes/p1893/ Engine Torque Signal Low Voltage | Powertrain | Medium |
| P1894 | Engine Torque Signal High Voltage → /auto/codes/p1894/ Engine Torque Signal High Voltage | Powertrain | Medium |
| P1895 | TCM To ECM Torque Reduction Circuit → /auto/codes/p1895/ TCM To ECM Torque Reduction Circuit | Powertrain | Medium |
| P1899 | Park Neutral Position Switch Stuck In Park Or In Gear → /auto/codes/p1899/ Park Neutral Position Switch Stuck In Park Or In Gear | Powertrain | Medium |
Our departments
Everything you need, picked by us
Spare parts comparator, new and usedfrom the fault code to the part
Tools and diagnosticsfor repairing it yourself
Tyres for car, motorbike, scootertyres and wheels, in 15 countries
Accessoriesinside and outside the cabin
Tuningsuspension, turbo, exhausts
Batteriesstarting and charging
Coming soonDealership car, motorbike, scootervehicles for sale