Code
C1000
MERCEDES-BENZ
C — Chassis
Traction System Control Module
Views:
UK: 16
EN: 23
RU: 35
AI status
Completed
Completed
100%
Causes
- Faulty traction/ESC control module
- Loss of communication on CAN/LIN bus to traction module
- Supply voltage or ground fault to module (blown fuse, poor ground)
- Corroded or damaged connector/wiring to module
- Faulty wheel speed, yaw rate or steering angle sensors
- Intermittent power interruptions (battery, charging system)
Symptoms
- Traction control/ESC warning lamp illuminated
- ABS or brake warning lamp may also be on
- Traction control disabled or operating intermittently
- Possible reduced engine power or limp mode in some vehicles
- No communication with traction module reported by diagnostic tool
What to check
- Read all stored and pending fault codes (vehicle-specific scanner) and note freeze-frame data
- Check battery voltage and charging system—ensure stable 12–14.5 V with engine running
- Inspect fuses and relays related to ABS/traction/ECU power and ignition circuits
- Visually inspect traction control module connector for corrosion, bent pins or water ingress
- Check grounding points for corrosion/tightness near module and chassis grounds
- Verify CAN bus communication with scan tool (module present/response) and check for U-codes
Signal parameters
- Module supply voltage (key on/run): ~11–14.5 V; no undervoltage or large drops
- CAN bus idle (recessive) voltages: approx. 2.5 V on CAN_H and CAN_L each; differential ~0 V recessive
- CAN dominant state differential typically ~1–2 V between CAN_H and CAN_L when active
- Wheel speed sensor: passive sensors produce AC pulses proportional to wheel speed; active sensors provide digital/variable voltage—compare left/right frequencies/voltages
- Ground continuity: low ohms to chassis ground (
Diagnostic algorithm
- Connect manufacturer-level scan tool and read all stored, pending and history codes from ABS/traction and gateway modules; record module presence and communication status.
- Check vehicle battery state and charging system; verify stable supply voltage under load. Replace or charge battery if low.
- Inspect fuses/relays for ABS/traction control circuits; backprobe module supply and ignition feed for correct voltage with key on and engine running.
- Visually inspect and wiggle-test connectors, wiring harnesses, and module mounting for corrosion, water ingress, or damaged pins; repair as required.
- With scan tool monitor CAN bus status and attempt communication to traction module; if module not responding, check CAN wiring continuity and resistance between CAN nodes and gateway.
- Verify grounds: measure resistance from module ground to chassis ground; repair poor grounds.
- Check wheel speed, yaw rate and steering angle sensor signals at sensors and at module connector while rotating wheel or turning steering; compare left/right sensor outputs.
- If wiring, power and communication are good but code persists, attempt module reinitialization: clear codes, cycle ignition and road test while monitoring. If reoccurs, reflash/update module software if dealer-level updates available.
- If software update and wiring tests fail, consider module replacement following manufacturer coding/programming and perform required sensor/module calibrations (yaw/steering angle, ABS bleed or basic settings).
- After repairs, clear codes and perform a full road test per manufacturer procedure; confirm no reoccurrence and that all safety systems function normally.
Likely causes
- Missing or low supply voltage to the traction control module (fuse/connector)
- CAN bus communication fault between ABS/traction and gateway (lost comm)
- Damaged connector or corroded pins at the traction module
- Internal module failure or memory fault requiring reflash/replacement
- Related sensor failure (wheel speed, yaw, steering angle) causing module error
Fault status
Status
Traction control module fault — possible internal module fault, power/ground issue, or communication loss. Traction/ESC may be disabled.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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