What Does P1880 Mean?
The Hall effect sensor power circuit is shorted to battery voltage, or on 4WD vehicles, there's an electrical fault in the 4WD low switch circuit. This results in excessive voltage reaching the sensor or switch circuit.
Common Causes
40%
Chafed or damaged wiring causing short to battery voltage
25%
Faulty 4WD low range switch with internal short to power
20%
Failed Hall effect sensor with internal short circuit
15%
Water intrusion or contamination in connector causing voltage bleed
Diagnostic Steps
1
Step 1: Disconnect Hall effect sensor and 4WD switch connectors, clear codes and retest to isolate circuit
2
Step 2: Measure voltage at disconnected sensor/switch harness connector pins with key on (should read 0V if shorted)
3
Step 3: Inspect entire wiring harness for chafing, pinch points, or damage near hot or moving components
4
Step 4: Test 4WD low switch resistance and operation through its range of motion
5
Step 5: Use wiring diagram to trace circuit from TCM to components, checking for shorts to power at multiple points
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
The Hall effect sensor power circuit is shorted to battery voltage, or on 4WD vehicles, there's an electrical fault in the 4WD low switch circuit. This results in excessive voltage reaching the sensor or switch circuit.
The most common cause of P1880 (Transmission Automatic Hall Effect Sensor Power Circuit Short To Battery / 4WD Low Switch Circuit Electrical) is: Chafed or damaged wiring causing short to battery voltage
Typical repair costs for P1880 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May prevent proper 4WD operation or cause transmission control issues. Vehicle may enter limp mode or be stuck in one drive mode.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1880 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control System / Transfer Case System
Difficulty
Type
Manufacturer
Recommended Tools
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