What does P1875 mean on a Chevy?

P1875. 4WD Low Switch Circuit Electrical. Applies to Silverado, Sierra, Tahoe, Yukon, Suburban.

What causes P1875 on a Chevy?

Faulty transfer case control module or 4WD low switch Open or short to ground in the 4WD low signal circuit Corroded transfer case or PCM connectors Transfer case stuck between ranges skewing the gear ratio check Faulty powertrain control module input

How do I fix P1875 on a Chevy?

Engage 4LO and verify the transfer case gear ratio with a Tech2 scan tool Test the 4WD low signal circuit for opens and shorts to ground Inspect transfer case switch and control module connectors Confirm the transfer case fully engages each selected range Replace the switch or control module only after circuit testing

Code

P1875

4WD Low Switch Circuit Electrical

Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: Silverado, Sierra, Tahoe, Yukon, Suburban
Related: No single generic twin. See OBD Codes List

What it means

P1875. 4WD Low Switch Circuit Electrical. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Yukon, Suburban.

Findings, check these first

Faulty transfer case control module or 4WD low switch
Open or short to ground in the 4WD low signal circuit
Corroded transfer case or PCM connectors
Transfer case stuck between ranges skewing the gear ratio check
Faulty powertrain control module input

Standard procedure

Engage 4LO and verify the transfer case gear ratio with a Tech2 scan tool
Test the 4WD low signal circuit for opens and shorts to ground
Inspect transfer case switch and control module connectors
Confirm the transfer case fully engages each selected range
Replace the switch or control module only after circuit testing

Look up another code

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Sources and review

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Last updated 2026-09-13.

Report a correction for P1875. Include your vehicle, the issue and a source if you have one.