Fault code C1220 – a step-by-step guide to diagnosing and fixing it

The meaning of error code C1220 – Lamp ABS Warning Output Circuit Short To Battery

C1220: Causes, signs and repairs

Error code C1220 is displayed and the check engine light is on - what does this mean?

The DTC C1220 is a fault code in the OBD/EOBD system that indicates a problem with the ABS wheel speed sensor or its circuit. This trouble code is set by the vehicle control unit when a signal from the wheel speed sensor is missing or outside the normal parameters.

What causes can this error code have?

Defective ABS wheel speed sensor
Damaged or interrupted sensor cable
Corroded or loose plug connections
Dirty or damaged sensor ring (reluctor ring)
Defective ABS control unit
Mechanical damage to the wheel bearing
Excessive air gap between sensor and sensor ring
Short circuit in the sensor wiring

What symptoms occur in parallel with fault code C1220?

ABS warning light: The ABS indicator light is permanently illuminated on the dashboard
ESP/ESC malfunction: The electronic stability program may fail
Braking problems: Extended braking distances during emergency braking
Jerky brakes: Uneven braking behavior at low speeds
Traction control: ASR/TCS system not working properly
Vehicle diagnostics: OBD scanner displays fault code C1220

How to fix the problem of fault code C1220?

Repairing EOBD fault code C1220 requires a systematic diagnosis of the ABS components.
Replacement of the defective ABS wheel speed sensor with an original part or equivalent replacement
Repair or replacement of the damaged sensor wiring including insulation and shielding
Cleaning and treatment of corroded plug connections with contact spray and sealant
Replacing the worn or damaged sensor ring on the wheel bearing or drive shaft
Setting the correct air gap between the sensor and sensor ring in accordance with the manufacturer's specifications
Replacement of the defective ABS control unit after prior coding and calibration
Complete replacement of the wheel bearing in the event of mechanical damage or excessive play

FAQ - Frequently asked questions about DTC C1220

Can I continue driving with error code C1220?

The vehicle is basically ready to drive, but ABS, ESP and traction control are not working. There is no immediate danger when driving normally, but in emergency situations the braking distances can become significantly longer.

How much does it cost to repair error code C1220?

The repair costs vary depending on the cause: a new wheel speed sensor costs 50-150 euros, cable repairs 80-200 euros, an ABS control unit 300-800 euros. Working time is usually 1-3 hours.

How can I diagnose code C1220 myself?

You can read out the dtc with an OBD scanner. Visually check the sensor cables for damage and clean the sensor area to remove dirt and metal shavings.

Does error code C1220 occur in certain weather conditions?

Yes, moisture and salt water can cause corrosion on the plug connections. Such problems occur particularly frequently in winter after salt has been scattered.

Can code C1220 come back after the repair?

If the root cause has not been fully rectified or poor quality spare parts have been used, the trouble code may reoccur. A professional repair should solve the problem permanently.

Does fault code C1220 affect the main inspection?

Yes, an active ABS fault code will result in the MOT sticker being refused as road safety is impaired. The fault code must be rectified before the main inspection.

Vehicles in which fault code C1220 occurs most frequently

Fault code C1220 is an ABS-specific diagnostic trouble code and can occur in various vehicle manufacturers, but is most common in the following vehicles:

BMW: 3 Series (E46, E90), 5 Series (E39, E60), X3 (E83), X5 (E53) (1998-2013)
Mercedes-Benz: C-Class (W203, W204), E-Class (W211, W212), ML-Class (W163, W164) (2000-2015)
Audi: A4 (B6, B7, B8), A6 (C5, C6), Q5 (8R), Q7 (4L) (1999-2016)
Volkswagen: Golf (IV, V, VI), Passat (B5.5, B6, B7), Touareg (7L, 7P) (2001-2014)
Ford: Focus (II, III), Mondeo (III, IV), Kuga (I), S-Max (2004-2018)
Opel: Astra (H, J), Vectra (C), Insignia (A), Zafira (B) (2002-2017)
Peugeot: 307, 308, 407, 508, 3008, 5008 (2001-2019)
Renault: Mégane (II, III), Laguna (II, III), Scenic (II, III) (2002-2016)

If code C1220 occurs in your vehicle, a prompt diagnosis is recommended, as the safety systems are impaired. While the vehicle remains drivable, you should drive with particular care and avoid abrupt braking maneuvers. A professional workshop can use special diagnostic technology to determine the exact cause and carry out a professional repair.

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