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DTC codes / C02xx · Brakes, steering and suspension / C0241

C0241ABS Warning Lamp Control Circuit

C0241 indicates that the antilock braking system (ABS) control module has detected a fault in the electrical circuit that operates the ABS warning lamp. The module monitors the lamp circuit for expected voltage or continuity and sets this code when the signal is outside the normal range, which can leave the ABS warning light either stuck on or unable to illuminate when required.

SystemChassis
Code typeGeneric (all makes)
SeverityLow
Fix difficultyIntermediate
AreaBrakes, steering and suspension

Symptoms you may notice

  • The ABS warning light may stay illuminated continuously after the bulb check.
  • The ABS warning light may fail to come on at all when the ignition is switched on.
  • Other dashboard warning lights, such as the traction control or brake system lamp, may also be affected if they share a common driver circuit.
  • The ABS system may be disabled, though normal braking usually remains functional.
  • Often no symptoms besides the warning light, with no change in brake pedal feel or vehicle handling.
  • In some vehicles, a chime or message may appear indicating a brake system fault.

Common causes, most likely first

  1. A burned-out or damaged ABS warning bulb or light-emitting diode (LED).
  2. Corroded, loose, or disconnected electrical connector at the ABS warning lamp or instrument cluster.
  3. Damaged wiring in the lamp control circuit, such as a short to ground or an open circuit.
  4. Faulty ABS control module output driver for the warning lamp.
  5. Poor ground connection for the instrument cluster or lamp circuit.
  6. Water intrusion or corrosion in the ABS module connector or fuse box.
  7. Aftermarket accessories or improper wiring repairs that interfere with the lamp circuit.

How to diagnose and fix it

  1. Verify the ABS warning lamp operation during the instrument cluster bulb check with the ignition on.
  2. Inspect the ABS warning lamp bulb or LED and replace it if it is open or damaged.
  3. Check the connector and wiring at the instrument cluster and ABS module for corrosion, looseness, or damage.
  4. Measure resistance and voltage on the lamp control circuit to identify opens or shorts, using the factory wiring diagram.
  5. Test the ABS control module's lamp output with a scan tool or oscilloscope to confirm driver function.
  6. Repair any damaged wiring or connectors and clear the code to see if it returns.
  7. If the circuit and lamp are good, follow the manufacturer's diagnostic flow for internal ABS module testing or replacement.

The lamp circuit is not always the bulb

  • A common oversight is replacing the ABS warning bulb without checking the control module's output driver, which can be the actual failure point.
  • This code can set even when the ABS system itself is fully functional, because it only monitors the warning lamp circuit and not the wheel speed sensors or hydraulic pump.
  • Corrosion in the ABS module connector often mimics a failed module, so a thorough visual inspection of the pins and terminals is essential before condemning the module.
  • Some vehicles use a shared driver for multiple warning lamps, so a fault in one circuit can cause other unrelated lamps to behave erratically.
  • Aftermarket alarm or remote start installations frequently tap into the instrument cluster wiring and can introduce faults in the lamp control circuit.

Can I keep driving with C0241?

The vehicle remains safe to drive under normal conditions because the base braking system is unaffected, but you should avoid relying on ABS or traction control features until the fault is repaired. Have the circuit inspected soon to ensure the warning lamp can alert you to future ABS problems.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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