What Does P1825 Mean?
General circuit failure detected in the transfer case clockwise shift relay coil circuit. The PCM has identified a malfunction in the relay control system but hasn't isolated the specific fault type.
Common Causes
30%
Intermittent wiring connection or loose connector at relay or control module
25%
Failed transfer case shift relay with intermittent operation
20%
High resistance in relay control circuit due to corrosion or damaged wiring
15%
Transfer case shift motor mechanical binding causing relay overload
10%
PCM/TCM relay driver circuit malfunction or software issue
Diagnostic Steps
1
Step 1: Inspect all relay and control module connections for corrosion, looseness, or damage
2
Step 2: Test transfer case shift relay by swapping with identical relay if available and retest operation
3
Step 3: Measure voltage and ground at relay coil terminals with relay removed during commanded operation
4
Step 4: Check for proper relay operation by manually activating and listening for relay click
5
Step 5: Monitor transfer case shift motor current draw during operation to detect mechanical binding
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
General circuit failure detected in the transfer case clockwise shift relay coil circuit. The PCM has identified a malfunction in the relay control system but hasn't isolated the specific fault type.
The most common cause of P1825 (Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure) is: Intermittent wiring connection or loose connector at relay or control module
Typical repair costs for P1825 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transfer case may fail to engage or disengage 4WD modes. Unexpected mode changes or inability to shift could affect traction control and vehicle stability in adverse conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1825 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transfer Case Control System
Difficulty
Type
Manufacturer
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