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.
AWD System DTCS
/Performance Problem (2013-18) C1850-12 Fail Safe Relay Stuck ON (2013-15) C1850-12 Fail Safe Relay Stuck ON (2016-18) C1850-14 Fail Safe Relay Stuck OFF (2013-15) C1850-14 Fail Safe Relay Stuck OFF (2016-18) C1851-18 Motor Circuit Low Current (2013-18) C1851-19 Control Module Internal Control Module Malfunction (2013-18) C1851-1E Motor Circuit High Current (2013-18) C1852-18 Solenoid Valve Circuit Low Current (2013-18) C1852-19 Solenoid Valve Circuit High Current (2013-18) C1858-72 Differential Fluid Pressure Deviation Low (2013-18) C1858-73 Differential Fluid Pressure Deviation High (2013-18) C1860-98 Differential Fluid Overheated (2013-18) C1861-9A Vehicle Spin Detected (2013-18) C1870-00 Related Malfunctions (2013-18) C1873-00 Steering Angle Sensor Malfunction (2013-18) U0100-00 F-CAN Malfunction (2013-15) U0100-00 F-CAN Malfunction (2016-18) U3000-49 Control Module Internal Control Module Malfunction (2013-18) U3000-51 Control Module Programming Error (2013-18)
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.