What Does P1875 Mean?
This code indicates either a Hall effect sensor power circuit shorted to battery voltage or an electrical fault in the 4WD Low switch circuit. The Hall effect sensor monitors transfer case position while the 4WD Low switch signals engagement of low-range gearing.
Common Causes
35%
Shorted or damaged wiring to Hall effect position sensor at transfer case
25%
Failed Hall effect sensor with internal short circuit
20%
Damaged 4WD Low switch or contaminated switch contacts
15%
Corroded or moisture-damaged connector at transfer case causing cross-circuit short
5%
Transfer case control module internal fault creating voltage feedback
Diagnostic Steps
1
Step 1: Disconnect the Hall effect sensor connector at the transfer case and check for voltage on the 5V reference or signal wire
2
Step 2: Measure resistance of the Hall effect sensor according to specifications and check for short to power within sensor
3
Step 3: Inspect transfer case connector for moisture, corrosion, or physical damage that could cause cross-circuit contamination
4
Step 4: Test 4WD Low switch operation with multimeter, checking for proper resistance values and absence of short to battery
5
Step 5: Check wiring harness routing near exhaust, frame rails, and moving components for damage or chafing
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
This code indicates either a Hall effect sensor power circuit shorted to battery voltage or an electrical fault in the 4WD Low switch circuit. The Hall effect sensor monitors transfer case position while the 4WD Low switch signals engagement of low-range gearing.
The most common cause of P1875 (Transmission Automatic Hall Effect Sensor Power Circuit Short To Battery / 4WD Low Switch Circuit Electrical) is: Shorted or damaged wiring to Hall effect position sensor at transfer case
Typical repair costs for P1875 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transfer case may not shift properly or may become stuck in one mode. Vehicle should be driven cautiously as 4WD engagement may be unpredictable, and dashboard indicators may not reflect actual transfer case position.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1875 to identify the root cause.
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Quick Info
Category
Powertrain
System
4WD Transfer Case Control System
Difficulty
Type
Manufacturer
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