C1105

Code

Other C — Chassis

Traction Control Disable Lamp - Circuit Short to Battery

Brand: Other

Type: C — Chassis

Views: UK: 28 EN: 54 RU: 38

AI status

Completed

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Page language: EN

Causes

Short to battery voltage on the TCS/ESC lamp circuit
Faulty traction control disable switch (stuck/shorted)
Damaged wiring harness or pinched/chafed wire
Corroded or mis-routed connector at dash lamp or module
Faulty instrument cluster or lamp assembly (internal short)
Faulty ABS/traction control module output driver

Symptoms

Traction control disable (TCS or ESC OFF) warning lamp illuminated or intermittently lit
Traction control may be disabled or behave unpredictably
Related stability/traction fault indicators present
Possible loss of some traction control functions

What to check

Visual inspection of wiring and connectors between instrument cluster, traction disable switch and ABS/ESC module
Verify fuse condition for instrument cluster and ABS circuits
Use a DVOM to measure voltage at the lamp connector with ignition ON and engine OFF
Disconnect the lamp or cluster connector and check for battery voltage present on the module control pin
Scan tool: read live data and status of traction control disable input/outputs and attempt to clear code
Inspect for recent repairs or aftermarket accessories around dash wiring that could have spliced power

Signal parameters

Expected lamp circuit voltage (with lamp connected and module driving off): 0–1 V when output is low, ~12 V when lamp is powered by fuse (varies by vehicle)
Short-to-battery condition: constant ~11–14 V present on the control/output pin when it should be low or open
Resistance from lamp output to battery positive with circuit disconnected: near infinite (open) or very high for healthy circuit; low resistance indicates short
Lamp current draw typical: LEDs 20–200 mA; incandescent bulbs higher — abnormal high current suggests short

Diagnostic algorithm

Retrieve freeze frame and supporting data with a scan tool and note lamp status and related codes.
Perform a visual inspection of dash harness, instrument cluster, traction disable switch and ABS module connectors for damage or corrosion.
With ignition ON (engine off), backprob the lamp control pin at the cluster and measure voltage. If ~12 V is present when it should be low or open, suspect a short to battery.
Disconnect the instrument cluster or lamp connector. Re-check the module control pin for battery voltage. If voltage disappears, problem is at cluster/lamp; if still present, problem is upstream/module.
Disconnect or remove the TCS disable switch and inspect/sense for battery feed on switch terminals. Repair/replace if internally shorted or miswired.
If lamp or cluster is suspected, remove the lamp/LED and re-test circuit for voltage and resistance. Replace cluster or lamp assembly if internal short is confirmed.
Trace wiring harness from the output pin to the lamp and switch. Repair any chafed, pinched, or corroded wiring or incorrect splices to constant power.
If wiring and load check good but output still stuck high, test/replace ABS/ESC control module per manufacturer procedures.
After repairs, clear codes and perform a road test to confirm lamp and traction control operation; re-scan to verify C1105 does not return.

Likely causes

Lamp circuit wire rubbed through and contacting battery feed or constant 12V source
Aftermarket device or recent repair introduced a splice to constant power on that circuit
Traction control disable switch internally shorted to battery feed
Instrument cluster lamp (LED/bulb) failed internally and is feeding voltage back into the circuit
ABS/ESC module driver transistor failed and is stuck high

Fault status

⚠️ Status

Traction Control Disable Lamp circuit shorted to battery voltage. The module detected an unintended high voltage on the lamp control circuit and stored fault C1105. Lamp may be illuminated continuously and traction control may be disabled.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours