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Home / DTC / C2250 — Anti-lock Brake System (ABS) Control Fault

C2250 — Anti-lock Brake System (ABS) Control Fault

Detailed page for trouble code C2250.

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C2250

Generic C — Chassis

Anti-lock Brake System (ABS) Control Fault

Brand: Generic
Type: C — Chassis
Views: UK: 4 EN: 5 RU: 1
AI status
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Page language: EN

Causes

  • Low or unstable battery voltage
  • Blown ABS fuse or failed relay
  • Poor or corroded power/ground connections to ABS module
  • Faulty wheel speed sensor(s) or damaged sensor tone ring
  • Damaged wiring harness or connector to ABS module
  • Faulty ABS control module (internal fault)

Symptoms

  • ABS warning light illuminated on dash
  • Traction/stability control warning lamp may also be on
  • ABS may be disabled — no ABS operation during hard braking
  • Longer stopping distance under hard braking on slippery surfaces
  • Intermittent or permanent loss of traction control functionality
  • Diagnostic trouble codes stored in ABS or body control module

What to check

  • Read ABS and related module codes with a capable scanner; record freeze-frame data
  • Check vehicle battery voltage and charging system (key on and engine running)
  • Inspect ABS fuses and relays; verify continuity and correct operation
  • Visual inspection of ABS module connectors and wiring for corrosion, damage, or loose pins
  • Check chassis and module ground connections for tightness and corrosion
  • Scan CAN bus for communication errors or other modules reporting faults

Signal parameters

  • Module supply voltage: steady ~12 V (key ON); not less than 11.5 V during cranking/operation
  • Module ground: near 0 ohms to chassis (low resistance)
  • CAN bus idle voltages: CAN_H ≈ 2.5–3.5 V, CAN_L ≈ 1.5–2.5 V; differential ~0 V when idle? (expect ~2.5 V common-mode; proper differential behavior during traffic)
  • Wheel speed (active sensor): 0–5 V square/pulse output proportional to wheel speed
  • Wheel speed (passive/variable reluctance): AC voltage amplitude and frequency increase with speed (mV to volts depending on speed)
  • ABS pump current draw: varies by vehicle; compare to specification (no unusually high stall current)

Diagnostic algorithm

  1. Connect a full-function scan tool and read all stored and pending ABS and network codes; note freeze-frame and occurrence frequency
  2. Verify battery state-of-charge and charging system; charge battery to full and retest if low
  3. Inspect and test ABS fuses and relays; replace if suspect and clear codes
  4. Visually inspect ABS module and sensor connectors for damage, corrosion, or water ingress; repair as needed
  5. Check and clean ground points for ABS module and main chassis grounds; measure voltage drop while cranking and during ABS module operation
  6. Backprobe wheel speed sensor circuits; measure sensor output while rotating each wheel (compare left/right and specified ranges)
  7. Perform wiggle tests on harnesses while monitoring live sensor data and for code reappearance to find intermittent opens/shorts
  8. Check CAN bus communication to ABS module with scope or scanner; verify module responds to tool; if no response, check bus termination and continuity
  9. Use bi-directional control to command ABS pump and valves (if supported) to confirm hydraulic unit operation; measure pump current and compare to spec
  10. If wiring, sensors, fuses, and grounds check good and CAN communications are present but fault persists, consider module software update or replacement per manufacturer procedure; follow proper programming/initialization
  11. After repairs, clear codes and perform a road test with scanner connected to verify no reoccurrence and that ABS functions correctly

Likely causes

  • Battery voltage below 11.5 V during key-on or while driving
  • Loose or corroded ground at ABS module or chassis
  • Intermittent open/short in wheel speed sensor wiring
  • ABS module not receiving CAN bus communications
  • Failed pump motor or internal ABS hydraulic valve fault
  • Blown fuse or faulty relay supplying ABS module power

Fault status

⚠️ Status
ABS Control Fault (C2250): ABS control module detected a fault. ABS/traction functions may be disabled until repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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