1999 A4, 2.8 Quattro

P1857

Transmission transfer case contact plate 'c'
short circuit to battery

Appreciate!

 

check the wiring on the transfer case not my area but it seems obvious

 

P18XX - Transmission

P1800 Transmission clutch Interlock safety switch circuit failure
P1801 Transmission clutch Interlock safety switch Open circuit
P1802 Transmission clutch Interlock safety switch short circuit to Battery
P1803 Transmission clutch Interlock safety switch short circuit to ground
P1804 Transmission 4-wheel drive High indicator circuit failure
P1805 Transmission 4-wheel drive High indicator Open circuit
P1806 Transmission 4-wheel drive High indicator short circuit to battery
P1807 Transmission 4-wheel drive High indicator short circuit to ground
P1808 Transmission 4-wheel drive Low indicator circuit failure
P1809 Transmission 4-wheel drive Low indicator Open circuit
P1810 TFP valve position switch circuit / transmission 4-wheel drive Low indicator short circuit to battery
P1811 Transmission 4-wheel drive Low indicator Short to ground
P1812 Transmission 4-wheel drive mode select circuit failure
P1813 Transmission 4-wheel drive mode select Open circuit
P1814 Transmission 4-wheel drive mode select short to battery
P1815 Transmission 4-wheel drive mode select short to ground
P1816 Transmission Neutral safety switch circuit failure
P1817 Transmission Neutral safety switch Open circuit
P1818 Transmission Neutral safety switch Short circuit to battery
P1819 Transmission Neutral safety switch Short circuit to ground
P1820 Transmission transfer case clockwise shift relay coil circuit failure
P1821 Transmission transfer case clockwise shift relay coil Open circuit
P1822 Transmission transfer case clockwise shift relay coil Short circuit to battery
P1823 Transmission transfer case clockwise shift relay coil Short circuit to ground
P1824 Transmission 4-wheel drive clutch relay circuit failure
P1825 Transmission 4-wheel drive clutch relay Open circuit
P1826 Transmission 4-wheel Low clutch relay circuit to battery
P1827 Transmission 4-wheel Low clutch relay circuit to ground
P1828 Transmission transfer case counter clockwise shift relay coil circuit failure
P1829 Transmission transfer case counter clockwise shift relay coil Open circuit
P1830 Transmission transfer case counter clockwise shift relay coil short circuit to battery
P1831 Transmission transfer case counter clockwise shift relay coil short circuit to ground
P1832 Transmission transfer case differetial lockup solenoid circuit failure
P1833 Transmission transfer case differetial lockup solenoid Open circuit
P1834 Transmission transfer case differetial lockup solenoid short circuit to battery
P1835 Transmission transfer case differetial lockup solenoid short circuit to ground
P1836 Transmission transfer case front shaft speed sensor circuit failure
P1837 Transmission transfer case rear shaft speed sensor circuit failure
P1838 Transmission transfer case shift motor circuit failure
P1839 Transmission transfer case shift motor Open circuit
P1840 Transmission transfer case shift motor short circuit to battery
P1841 Transmission transfer case shift motor short circuit to ground
P1842 Transmision transfer case differential lockup feedback switch circuit failure
P1843 Transmision transfer case differential lockup feedback switch Open circuit
P1844 Transmision transfer case differential lockup feedback switch short circuit to battery
P1845 Transmision transfer case differential lockup feedback switch short circuit to ground
P1846 Transmission transfer case contact plate A circuit failure
P1847 Transmission transfer case contact plate A Open circuit
P1848 Transmission transfer case contact plate A Short circuit to battery
P1849 Transmission transfer case contact plate A short circuit to ground
P1850 Transmission transfer case contact plate B circuit failure
P1851 Transmission transfer case contact plate B Open circuit
P1852 Transmission transfer case contact plate B Short circuit to battery
P1853 Transmission transfer case contact plate B Short circuit to ground
P1854 Transmission transfer case contact plate C circuit failure
P1855 Transmission transfer case contact plate C Open circuit
P1856 Transmission transfer case contact plate C Short circuit to battery
P1857 Transmission transfer case contact plate C Short circuit to ground
P1858 Transmission transfer case contact plate D circuit failure
P1859 Transmission transfer case contact plate C Open circuit
P1860 TCC PWM solenoid circuit electrical / transmission transfer case contact plate D Short circuit to battery
P1861 Transmission transfer case contact plate D Short circuit to ground
P1862 Transmission transfer case contact plate power circuit failure
P1863 Transmission transfer case contact plate power Open circuit
P1864 Transmission transfer case contact plate power Short circuit to battery
P1865 Transmission transfer case contact plate power Short circuit to ground
P1866 Transmission transfer case system concern - Setting required
P1867 Transmission transfer case contact plate General circuit failure
P1868 Transmission automatic 4-wheel drive indicator lamp circuit failure
P1869 Transmission automatic 4-wheel drive indicator lamp circuit Short to battery
P1870 Tansmission component slipping/Transmission mechanicl transfer case 4x4 switch circuit malfunction
P1871 Transmission mechanical transfer case 4x4 switch circuit Short to battery
P1872 Transmission mechanical 4-wheel drive Axle lock lamp circuit failure
P1873 Transmission mechanical 4-wheel drive Axle lock lamp circuit Short to battery
P1874 Transmission automatic hall effect sensor power circuit failure
P1875 Transmission automatic hall effect sensor power circuit Short to battery / 4wd Low switch circuit electrical
P1876 Transmission transfer case 2-wheel drive solenoid circuit failure
P1877 Transmission transfer case 2-wheel drive solenoid circuit Short to battery
P1878 Transmission transfer case disengaged solenoid circuit failure
P1879 Transmission transfer case disengaged solenoid Open circuit
P1880 Transmission transfer case disengaged solenoid short to battery
P1881 Engine coolant level switch circuit failure GEM
P1882 Engine coolant level switch circuit Short to ground
P1883 Engine coolant level switch circuit failure GEM
P1884 Engine coolant level lamp circuit Short to ground
P1885 Transmission transfer case disengaged solenoid Short to ground
P1886 4x4 Initialisation failure
P1890 Transmission 4wd mode select return input circuit failure
P1891 Transmission transfer case contact plate ground return Open circuit

 

If you get that code when reading the, 4th, transmission computer
disreguard:

18265 P1857 Load Signal Error Message from Engine Controller
Reset, and see if it returns.

 

Thanks!
I forgot to infer that this code appears with code P0102, something related with MAF.
After I replaced the air filter, the engine lightgoes off.

Is that possible code P1857 is something caused by P0102
and if not, since the engine light is off now, can I still get the error code using equipment at Autozone?

Thanks alot.

 

that's the one mate the filter being blocked would cause both codes, its like a computer pull the plug and many things happen and its the simplest thing that gets you

 

(:

 

P0102, low input from MAF. Hopefully you bought a
remanufactured MAF.