What Does P1829 Mean?
An open circuit exists in the transfer case counter-clockwise shift relay coil circuit. The PCM cannot energize the relay for counter-clockwise transfer case motor operation, preventing shift completion.
Common Causes
35%
Broken wire or poor connection in counter-clockwise relay control circuit
30%
Failed counter-clockwise shift relay with open coil
20%
Corroded or loose relay socket terminals
10%
Blown fuse in relay power or control circuit
5%
PCM/TCM relay driver output failure
Diagnostic Steps
1
Step 1: Check all transfer case related fuses for blown condition
2
Step 2: Remove counter-clockwise relay and test coil resistance (should be 50-120 ohms, not infinite)
3
Step 3: Inspect relay socket for corrosion, bent pins, or poor terminal tension
4
Step 4: Trace wiring from PCM/TCM to relay socket checking for continuity and breaks
5
Step 5: Monitor PCM/TCM relay driver output voltage during commanded operation with relay disconnected
Estimated Repair Cost
$100 - $750
Parts + labor, varies by vehicle and location
An open circuit exists in the transfer case counter-clockwise shift relay coil circuit. The PCM cannot energize the relay for counter-clockwise transfer case motor operation, preventing shift completion.
The most common cause of P1829 (Transmission Transfer Case Counter Clockwise Shift Relay Coil Open Circuit) is: Broken wire or poor connection in counter-clockwise relay control circuit
Typical repair costs for P1829 range from $100 to $750, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transfer case cannot shift in counter-clockwise direction, preventing return to 2WD or disengagement from 4WD. Vehicle may remain stuck in 4WD causing binding, tire wear, and handling problems on dry pavement.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1829 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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