What Does C1105 Mean?
This code indicates that the ABS/traction control module has detected a short to battery voltage in the traction control disable lamp circuit. The control module expects to ground this circuit to illuminate the warning lamp, but instead detects constant battery voltage present on the lamp control wire. This prevents the module from properly controlling the traction control indicator and may cause the lamp to remain constantly illuminated or behave erratically.
Common Causes
45%
Damaged wiring harness or chafed wire causing short to battery voltage between control module and dashboard indicator lamp
30%
Failed instrument cluster with internal short to power on the traction control lamp circuit
15%
Shorted traction control disable switch or its wiring providing constant power to lamp circuit
10%
Failed ABS/traction control module with internal short on lamp driver circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of all wiring from the instrument cluster to the ABS/traction control module, checking for chafed, pinched, or damaged wires, particularly at firewall pass-throughs and near moving components
2
Step 2: Using a digital multimeter, disconnect the instrument cluster connector and measure voltage on the traction control lamp circuit wire (consult wiring diagram for specific pin location). Key on, engine off - reading should be 0V with no battery voltage present
3
Step 3: If battery voltage is present at cluster connector, disconnect the ABS/traction control module connector and recheck voltage. If voltage disappears, problem is in the control module. If voltage remains, trace wiring between connectors for short to power
4
Step 4: If no voltage found at cluster connector in Step 2, reconnect cluster and disconnect ABS module connector. Measure resistance between the lamp control circuit pin and ground - should read infinite ohms. Low resistance indicates shorted instrument cluster
5
Step 5: Check traction control disable switch (if equipped) by disconnecting it and rechecking the lamp circuit for battery voltage. If voltage disappears, replace the switch
6
Step 6: After repairs, clear codes, cycle ignition, and verify lamp operates correctly during bulb check and that code does not return. Test drive and confirm traction control system functions properly
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
This code indicates that the ABS/traction control module has detected a short to battery voltage in the traction control disable lamp circuit. The control module expects to ground this circuit to illuminate the warning lamp, but instead detects constant battery voltage present on the lamp control wi...
The most common cause of C1105 (Traction Control Disable Lamp - Circuit Short to Battery) is: Damaged wiring harness or chafed wire causing short to battery voltage between control module and dashboard indicator lamp
Typical repair costs for C1105 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive as this affects only the indicator lamp circuit, not the traction control system operation itself. However, you will not receive proper warning lamp feedback about traction control status, so repair should be completed within a reasonable timeframe.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1105 to identify the root cause.
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Quick Info
Category
Chassis
System
Traction Control / ABS System
Difficulty
Type
Manufacturer
Recommended Tools
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