P1870
Transmission Component Slipping/ Transmission Mechanical Transfer Case 4x4 Switch Circuit Failure
Severity
🔴 HighCan you drive?
Do not drive — repair immediately
Approx. repair cost
$56–278 (est.)
Symptoms
- Gear slippage when shifting
- Check Engine light comes on
- Gear shifting problems
- Reduced vehicle power
- 4x4 system not working correctly
Causes
- Wear of transmission clutches
- Low transmission fluid level
- Transfer case switch malfunction
- Wiring harness damage
- Problems with the transmission control unit
How to Fix
- Check the level and condition of the transmission fluid
- Diagnose the condition of transmission clutches
- Check transfer case switch
- Inspect the wiring harness for damage
- Carry out diagnostics of the transmission control unit