P1875moderate severityPowertrain
4WD Low Switch Circuit
on 2015 Cadillac ATS 2.0L Turbo I4 · RWD
What this code means
The TCM detected a fault in the 4WD Low range switch circuit. This switch signals the TCM that the transfer case is in 4WD Low range so it can adjust shift strategy.
Symptoms
- Check Engine Light
- 4WD indicator light issues
- Transmission may not adapt shifts for 4WD Low
- Harsh shifting in 4WD Low range
Common causes
- Faulty 4WD Low switch in transfer case
- Wiring issue to switch
- Transfer case not fully engaging 4WD Low
- Corroded connector
Diagnostic steps
- Test 4WD Low switch signal with scan tool
- Inspect switch wiring
- Verify transfer case operation
- Check switch connector for corrosion
Repair notes
Replace 4WD Low switch or repair wiring. Ensure transfer case fully engages 4WD Low.
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