What Does P1846 Mean?
The transfer case shift motor circuit has a short to ground, preventing proper operation. The control module detects excessive current flow or zero resistance in the motor circuit.
Common Causes
35%
Failed transfer case shift motor with internal winding short to case
30%
Damaged wiring harness with exposed wire grounded to frame or transfer case
20%
Corroded or moisture-damaged motor connector causing ground short
15%
Control module driver circuit failure creating false ground fault detection
Diagnostic Steps
1
Step 1: Disconnect transfer case shift motor connector and inspect for corrosion, moisture, or damaged pins
2
Step 2: Measure resistance of shift motor windings - compare to manufacturer specifications (typically 2-10 ohms)
3
Step 3: Check resistance from motor power terminals to motor case/ground - should read infinite
4
Step 4: If motor tests good, measure resistance on harness side from power wires to ground - should be infinite
5
Step 5: Replace motor if internal short found, repair harness if wiring short located, or test control module output
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The transfer case shift motor circuit has a short to ground, preventing proper operation. The control module detects excessive current flow or zero resistance in the motor circuit.
The most common cause of P1846 (Transmission Transfer Case Shift Motor Short Circuit To Ground) is: Failed transfer case shift motor with internal winding short to case
Typical repair costs for P1846 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transfer case may be stuck in one range (2WD, 4Hi, or 4Lo) and unable to shift. This can cause drivetrain damage if operated in wrong mode for conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1846 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transfer Case / 4WD System
Difficulty
Type
Manufacturer
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