P1781
4x4 Low Switch Out of Self-Test Range Conditions
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Inability to activate 4x4 Low mode
- Incorrect operation of the all-wheel drive system
- Check engine light is on
- The car can only operate in 2WD or 4x4 High mode
- Other related trouble codes appear
Causes
- Faulty 4x4 Low switch
- Problems with wiring or connectors
- Open or short circuit in the circuit
- Four-wheel drive ECU malfunction
- Mechanical problems with transfer case
How to Fix
- Check 4x4 Low switch for damage
- Check the integrity of wiring and connectors
- Check resistance and voltage in switch circuit
- Replace 4x4 Low switch if necessary
- Check and, if necessary, replace the all-wheel drive system ECU