Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Infiniti QX56 AWDFACTORY OEM SERVICE PROCEDURE
Transfer Case DTCS
TRANSFER CASE (ATX90A) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC P1802 | TRANSFER CONTROL UNIT |
| DTC P1803 | TRANSFER CONTROL UNIT |
| DTC P1804 | TRANSFER CONTROL UNIT |
| DTC P1807 | OUTPUT SHAFT SPEED SENSOR |
| DTC P1808 | WHEEL SPEED SENSOR |
| DTC P1809 | TRANSFER CONTROL UNIT |
| DTC P180C | SENSOR POWER SUPPLY (5V) |
| DTC P180D | TRANSFER ROTARY POSITION SENSOR |
| DTC P180E | SENSOR POWER SUPPLY (8V) |
| DTC P180F | TRANSFER INTERNAL SPEED SENSOR |
| DTC P1811 | POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT |
| DTC P1813 | 4WD MODE SWITCH |
| DTC P1816 | PARKING/NEUTRAL POSITION SWITCH |
| DTC P1817 | TRANSFER MOTOR |
| DTC P181A | TRANSFER MOTOR TEMPERATURE SENSOR |
| DTC P181B | INCOMPLETE SELFSHUT |
| DTC P181C | TRANSFER MOTOR POWER SUPPLY |
| DTC P181E | STEERING ANGLE SENSOR |
| DTC P181F | INCOMPLETE CALIBRATION |
| DTC P1820 | ENGINE SPEED SIGNAL |
| DTC P1826 | TRANSFER FLUID TEMPERATURE |
| DTC P1829 | ACCELERATOR PEDAL POSITION SENSOR |
| DTC P182A | TRANSFER HI-LO POSITION SENSOR |
| DTC P182B | TRANSFER LOCK POSITION SENSOR |
| DTC P1830 | ABS OPERATION SIGNAL |
| DTC P1831 | VDC OPERATION SIGNAL |
| DTC P1832 | TCS OPERATION SIGNAL |
| DTC U1000 | CAN COMM CIRCUIT |
| DTC U1010 | CONTROL UNIT (CAN) |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.