Low or Abnormally High Battery Positive Voltage at the Skid Control ECU — supply voltage outside the module’s operating window makes it disable ABS, VSC and traction control by fail-safe; the fault is in the battery, charging or wiring (Toyota/Lexus)
The C1241 code means the vehicle's onboard diagnostic system has detected: Low or Abnormally High Battery Positive Voltage at the Skid Control ECU — supply voltage outside the module’s operating window makes it disable ABS, VSC and traction control by fail-safe; the fault is in the battery, charging or wiring (Toyota/Lexus). This is a serious severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- Varies — depends on the specific component this manufacturer-specific code points to on your vehicle. Diagnose before buying parts.
Manufacturer-specific code. C1241 is a manufacturer-specific DTC, so its exact definition can differ by make, model, and year. Use the meaning above as a general guide, and always confirm it against your vehicle manufacturer's official service information (or a make-specific scan tool) before diagnosing or replacing parts.
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Basic scanners cannot read ABS codes. This one reads all four systems so you know exactly which sensor failed.
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What Are the Symptoms of C1241?
- Check Engine or a related warning light on
- Exact symptoms depend on the specific system this code covers for your make
- A make-specific scan reveals which subsystem and circuit is involved
What Causes C1241? (Most Likely First)
- A fault in the specific component or circuit this code monitors (the exact part varies by manufacturer) High
- Damaged wiring, a corroded connector, or a poor ground in that circuit Moderate
- A related sensor or control module reporting or causing the fault Moderate
Can I Still Drive with C1241?
Yes, but fix soon. C1241 is rated serious severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring the light.
Frequently Asked Questions
Does C1241 mean the same thing on every vehicle?
No. C1241 is a manufacturer-specific diagnostic trouble code, so its exact meaning varies by make, model, and year. Always confirm it against your vehicle manufacturer's service information before diagnosing or replacing parts.
What does C1241 most likely indicate?
Low or Abnormally High Battery Positive Voltage at the Skid Control ECU — supply voltage outside the module’s operating window makes it disable ABS, VSC and traction control by fail-safe; the fault is in the battery, charging or wiring (Toyota/Lexus). Treat this as a general guide and verify the specifics for your vehicle.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose C1241?
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Confirm your exact make, model, and year first — C1241 is manufacturer-specific and can mean different things across brands.
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Read C1241 with an enhanced/make-specific scan tool and check your manufacturer's official service information for the precise definition and procedure.
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Inspect the wiring, connectors, and grounds for the indicated circuit before replacing any part.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- autocodes.comToyota page, "Low Power Supply Voltage Malfunction"
- engine-codes.comToyota page
Which Vehicles Commonly Get C1241?
- 2012-2023 BMW 3 Series
- 2014-2023 Mercedes-Benz C-Class
- 2010-2022 Audi A4
- 2013-2023 Lexus IS
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