C1105
Traction Control Disable Lamp - Circuit Short to Battery
Chassis Chassis/Safety Traction Control Lamp Circuit 🔴 Serious — Stop or limit driving
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What This Actually Means
In plain language — no jargon

The traction control disable lamp circuit is shorted directly to battery power, preventing the ECU from controlling the warning light properly. It's like a light switch that's stuck in the 'on' position because someone bypassed the actual switch with a direct wire.

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Symptoms You May Notice
3 known symptoms for this code
Traction control disable lamp stays on continuously
Lamp does not respond to ignition cycle or vehicle operation
ABS or stability control systems may be disabled or in limp mode
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the traction control disable lamp circuit voltage, which should be low (near ground) when off and pulled high through a driver circuit when on. A short to battery keeps the voltage at battery level regardless of ECU commands, preventing normal lamp control and signaling a wiring or driver fault.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Lamp circuit voltage 0V (off) or 12V (on, ECU-controlled) Stuck at 12V regardless of ECU command
Output driver current draw 0.5-2.0A when lamp commanded on High resistance or open circuit detected
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness inspection
Trace the lamp circuit from BCM/ECU to lamp for pinched, abraded, or corroded wires causing shorts to body ground or power.
2
Traction control disable lamp connector
Inspect and reseat the lamp connector; clean corrosion from pins and ensure proper seating to restore normal circuit voltage.
3
BCM/ECU output driver circuit
If wiring is good, the lamp driver transistor inside the module may be failed; module reprogramming or replacement is needed.