What Does C0146 Mean?
C0146 indicates the ABS/Traction Control System (TCS) module has detected an electrical circuit fault in the left side TCS solenoid #2. This solenoid controls hydraulic pressure to modulate braking force on the left wheel during traction control events. The control module has identified an open circuit, short to ground, short to power, or excessive resistance in the solenoid circuit that prevents proper operation.
Common Causes
35%
Failed TCS solenoid #2 in the ABS hydraulic control unit with internal coil open or short
30%
Damaged wiring harness or corroded connector pins between ABS module and TCS solenoid
20%
Internal ABS control module driver circuit failure for solenoid #2 control
10%
Water intrusion or corrosion inside ABS hydraulic unit affecting solenoid electrical connections
5%
Poor ground connection for ABS module or hydraulic control unit
Diagnostic Steps
1
Step 1: Perform visual inspection of ABS module wiring harness and connectors for damaged wires, corroded pins, water intrusion, or physical damage. Check connector locking tabs and seals for integrity.
2
Step 2: Using a digital multimeter, measure resistance across the left TCS solenoid #2 terminals (typically 2-6 ohms specification, verify in service manual). Compare readings to right side solenoid for reference.
3
Step 3: Disconnect ABS module connector and check for voltage on solenoid control circuit with ignition on (should show battery voltage when commanded by scan tool active test, or no voltage at rest). Verify ground circuit continuity to chassis ground (should be less than 1 ohm).
4
Step 4: Perform insulation resistance test between solenoid control circuit and ground with module disconnected (should read infinite resistance/open circuit). Check for short to power by measuring voltage with all components disconnected.
5
Step 5: If wiring and connections test good, suspect internal solenoid failure or ABS module driver circuit fault. Use scan tool active tests to command solenoid operation while monitoring amperage draw (typical 0.5-2 amps).
6
Step 6: After repair, clear codes, perform ABS self-test procedure, and road test vehicle including traction control activation to verify proper operation and confirm no code returns.
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
C0146 indicates the ABS/Traction Control System (TCS) module has detected an electrical circuit fault in the left side TCS solenoid #2. This solenoid controls hydraulic pressure to modulate braking force on the left wheel during traction control events. The control module has identified an open circ...
The most common cause of C0146 (Left TCS Solenoid #2 Circuit Malfunction) is: Failed TCS solenoid #2 in the ABS hydraulic control unit with internal coil open or short
Typical repair costs for C0146 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive normally but traction control will be disabled or significantly degraded, increasing risk of wheel spin on slippery surfaces. ABS functionality may be partially compromised. Repair should be completed within a few days, especially before winter weather or wet conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C0146 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Brake System (ABS) / Traction Control System (TCS)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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