ABS Actuator / Control-Unit Power-Supply (IGN) Voltage Malfunction (Nissan/Infiniti)
The C1109 code means the vehicle's onboard diagnostic system has detected: ABS Actuator / Control-Unit Power-Supply (IGN) Voltage Malfunction (Nissan/Infiniti). This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- Varies — depends on the specific component this manufacturer-specific code points to on your vehicle. Diagnose before buying parts.
Manufacturer-specific code. C1109 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.
Basic scanners cannot read ABS codes. BlueDriver reads all systems including ABS, SRS, and transmission through your phone.
Basic scanners cannot read ABS codes. This one reads all four systems so you know exactly which sensor failed.
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Common Symptoms
- 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
Probable Causes (Ranked by Likelihood)
- 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
Common Fixes by Vehicle
What techs usually find when diagnosing C1109 on specific vehicles — tap your vehicle for the fix and the exact part:
2003-2015 Nissan Altima/Nissan Maxima/Nissan Murano easy DIY
C1109 on Nissan and Infiniti is an ABS control-unit power-supply fault, and it is far more often a supply problem than a failed ABS module. Start with the battery and charging system - these ABS units are unusually sensitive to low or unstable voltage, and a weak battery alone will set it. Then check the chassis and engine grounds and the ABS unit's own connector for corrosion. A strong tell: if C1109 appears together with U1000 (a CAN communication code), you are almost certainly chasing one bad ground or a low-voltage condition affecting several modules at once, not two separate failures. Replace the ABS actuator only after voltage and grounds test clean. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.
Labor: 30 min (battery/ground testing)Frequently Asked Questions
Does C1109 mean the same thing on every vehicle?
No. C1109 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 C1109 most likely indicate?
ABS Actuator / Control-Unit Power-Supply (IGN) Voltage Malfunction (Nissan/Infiniti). Treat this as a general guide and verify the specifics for your vehicle.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
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Confirm your exact make, model, and year first — C1109 is manufacturer-specific and can mean different things across brands.
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Read C1109 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.
Commonly Affected Vehicles
- 2010-2022 Ford F-150
- 2012-2023 Toyota RAV4
- 2008-2020 Honda CR-V
- 2011-2023 Chevrolet Equinox
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