C1104
Traction Control Active Lamp - Circuit Short to Battery
Chassis Chassis/Safety Traction control indicator 🔴 Serious — Stop or limit driving
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What This Actually Means
In plain language — no jargon

The traction control warning light circuit is shorted directly to battery power, preventing the ECU from controlling it properly. It's like a light switch stuck in the on position because the wire bypassed the switch entirely.

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Symptoms You May Notice
3 known symptoms for this code
Traction control warning lamp stays illuminated constantly
Lamp does not respond to ignition cycle or system commands
Possible loss of traction control functionality
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the traction control lamp circuit voltage, which should toggle between ground and 12V under normal operation. When the circuit shorts directly to battery, the voltage remains at 12V continuously, preventing the ECU from controlling the lamp state. The ECU detects this abnormal static voltage condition and sets the fault code.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Lamp Circuit Voltage 0-12V (toggles with commands) Constant 12V (short to battery)
Lamp Control Response Changes state per ECU command Unresponsive; locked at 12V
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Traction control lamp wiring harness
Inspect the lamp circuit wiring for damage, pinches, or exposed conductors shorting to positive battery voltage, and repair or re-route as needed.
2
Traction control lamp connector
Disconnect and inspect the lamp connector pins for corrosion or bent contacts causing a short, clean or replace if damaged.
3
Traction control warning lamp assembly
Replace the lamp unit if internal wiring or circuitry is shorted to the lamp housing or positive supply.