P1878
Transmission Transfer Case Disengaged Solenoid Circuit Failure
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$28–89 (est.)
Symptoms
- Check Engine Light Is On
- Problems with switching all-wheel drive modes
- The car goes into emergency mode
- Reduced vehicle dynamics
- Possible jerking when moving
Causes
- Open or short circuit in solenoid circuit
- Transfer case solenoid malfunction
- Solenoid relay problems
- Transmission control unit malfunction
- Poor contact in wiring connectors
How to Fix
- Diagnostics of the solenoid circuit with a multimeter
- Checking Solenoid Resistance
- Inspect wiring and connectors for damage
- Replacing a faulty solenoid
- Resetting the error code and checking the system