Error code

OBD2 P0856

OBD2P0856
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Traction Control Input Signal.

Severity

moderateCan drive, but some safety features may be disabled.

Summary

P0856 indicates a malfunction in the traction control input signal, which means there's an issue with communication between the Powertrain Control Module (PCM) and the traction control system.

Symptoms

  • Traction control may be disabled
  • Stability control, cruise control, or ABS braking functions might be affected

Common Causes

  • Defective or failed control switch
  • Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors in the traction control system
  • Faulty wheel speed sensor or associated reluctor ring
  • Malfunctions in the ABS system (indicated by other codes)
  • Failed software in the traction control module or PCM

Diagnosis

  1. Inspect and test all wiring and connectors related to the traction control system.
  2. Check for other ABS-related codes that might indicate a broader issue with the braking system.
  3. Test wheel speed sensors and associated reluctor rings.
  4. Consider professional assistance if issues are found in the PCM or control modules.

Fixes

  • Replace faulty wiring, connectors, or control switch
  • Repair or replace defective wheel speed sensor and reluctor ring

FAQ

What happens if P0856 is not fixed?

The traction control system may be disabled, affecting stability and safety features.

Can I drive with P0856?

Yes, but some safety systems might be compromised. It's recommended to address the issue promptly.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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