C1109 Nissan Code: ABS Voltage Trouble Exposed

You’ve come across the C1109 code in your Nissan? Don’t you worry! Prepare to gain insights, solutions, and expert guidance for addressing this unique situation. 

In this article, we’ll explore the intricacies of the C1109 code, diving into its effects on your vehicle’s performance. From understanding symptoms to conducting diagnostics, we’ll walk you through each stage, keeping you informed and empowered throughout the process.

C1109 Nissan Code: A Quick Overview

Take a look at the summary of the Nissan C1109 code provided below!

  • Definition: Battery Voltage [Abnormal]
  • Severity: Medium
  • DIY Skill Level: Intermediate
  • Continue To Drive?: No
  • Estimated Repair Cost: $50 – $300

What Does The C1109 Nissan Code Mean?

The C1109 code in Nissan vehicles points to an issue labeled as “Battery Voltage [Abnormal]” within the Anti-lock Braking System (ABS) actuator and electric unit control (ECU) unit. This alert activates when the voltage being delivered to the ABS system goes outside the standard operational range. Specifically, it triggers when the voltage drops below 10 volts (indicating low ignition voltage) or rises above 16 volts (indicating high ignition voltage).

C1109 Nissan on a scanner
Using an OBDII scanner to retrieve the code to detect what is really going on with your Nissan.
(Credit: altimaforums.net)

The ABS system in a vehicle is a crucial safety feature that prevents wheel lock-up during heavy braking, enhancing control and stability. The C1109 code alerts the vehicle’s onboard diagnostics system that there is an issue with the battery voltage affecting the ABS control unit. This can lead to compromised performance of the ABS system and potentially impact the vehicle’s braking performance.

The C1109 code can be found in various Nissan models when battery voltage irregularities occur. Some of the Nissan models that are known to experience the C1109 code include Altima, Maxima,  Sentra,  Rogue,  Murano, 370Z, etc.

How Severe Is The C1109 Code On Nissan? 

The C1109 code’s severity in Nissan vehicles can vary from moderate to potentially hazardous. Continuing to drive with the C1109 code illuminated could jeopardize braking performance and compromise vehicle stability. It’s strongly advised to avoid driving with this code active

Get professional inspection and repair are recommended to ensure the ABS functions correctly, maintaining optimal control and safety while driving.

What Are The Signs Of The C1109 Code On Nissan Vehicles?

When the C1109 code surfaces in Nissan vehicles, it comes accompanied by noticeable symptoms that can’t be ignored. Being focused on the signs is crucial for timely diagnosis and resolution. Some of the common symptoms associated with the C1109 code include: 

  • Illuminated ABS warning light
  • Unusual brake pedal feel (sponginess or increased resistance)
  • Decreased effectiveness of the ABS system during braking
  • Irregularities in vehicle stability during abrupt stops

Read more: P1715 Nissan Code Solved: Tips For Dealing With Transmission Issues

What Are The Causes Of The C1109 Nissan Code? 

The underlying triggers behind the C1109 code in Nissan vehicles can be attributed to various components and systems within the vehicle. Understanding these potential causes is key to effectively addressing the issue:

  • Faulty harnesses or connectors in the ABS system
  • Malfunctioning ABS actuator and ECU
  • Blown fuse 
  • Defective ignition power supply system
  • Battery-related issues

How To Diagnose And Fix The C1109 Code On Nissan?

When dealing with the C1109 code, a systematic diagnosis and repair approach can effectively address the issue. Below is a comprehensive breakdown of the process, including essential tools and parts, a detailed step-by-step guide, and a DIY repair assessment:

Essential Tools And Parts

In order to effectively identify and rectify the C1109 code in Nissan vehicle, you will require the subsequent tools and components:

Step-by-Step Procedure

  1. Code retrieval and initial check
    • Use the OBD-II scanner to retrieve the C1109 code and associated freeze frame data.
    • Inspect the ABS warning light for illumination.
    • Check if there are any noticeable issues with braking performance.
  2. Visual inspection
    • Examine the wiring harnesses and connectors connected to the ABS unit for signs of damage, corrosion, or loose connections.
    • Pay special attention to any visible wear on the wiring insulation.
    • Replace or repair if necessary.
  3. Battery voltage test
    • With the vehicle’s engine running, use the multimeter to measure the battery voltage.
    • Check for voltage fluctuations during engine operation, noting any irregularities.
    • Inspect the battery for indications of loose terminals, insufficient voltage, or other anomalies.
    • If any components fail, proceed to repair or substitute them accordingly.
  4. ABS actuator and control unit test
    • Disconnect the ABS unit’s electrical connector.
    • Use the multimeter to check the resistance and continuity of the connector pins, comparing the readings with manufacturer specifications.
    • If the ABS unit or control unit is faulty, consider replacing it with a new or tested one.
  5. Clearing the code and test drive
    • Once repairs are made, use the OBD-II scanner to clear the C1109 code and any associated trouble codes.
    • Take the vehicle for a test drive to verify that the ABS system operates correctly and that the code does not return.
Watch the video by JLR Automobiles to learn how to address the C1109 related to the HV system warm-up process.


  • Ensure proper safety measures are taken, such as disconnecting the vehicle’s battery before working on electrical components.
  • Refer to the vehicle’s repair manual and wiring diagrams for accurate information.

Read more: P1217 Nissan Code: Engine Cooling Insights

DIY Repair Level And Estimated Costs

This procedure demands intermediate mechanical skills. While simple tasks like inspecting connectors are feasible for DIY enthusiasts, handling complex electrical components may require professional assistance. Prioritize accuracy and safety. If uncertain, consult a mechanic for a thorough diagnosis and repair.

Take a look at the estimated cost table we have provided for various necessary tasks.

Repair TaskEstimated Cost
Wiring and Connector Repair$50 – $150
Replacement ABS unit (if required)$200 – $500

This is just a rough estimate. Remember, costs can vary based on factors like location and specific tools chosen. Always gather accurate pricing information before proceeding with repairs.

C1109 Nissan Infographic

C1109 Nissan
Check this infographic for the summarized information about this C1109 code on Nissan vehicles.

Final Thoughts

Having explored this comprehensive article on the C1109 Nissan code, you now have a good insight into this code’s symptoms, causes, and repair procedures. This newfound knowledge empowers you to enhance your vehicle’s performance with confidence.

Share this newfound knowledge with fellow Nissan enthusiasts and join the conversation with your comments and questions below. 

Safe drive!

Reference Sources

  1. NiRogue, Nissan Rogue Service Manual.
  2. ALLDATAdiy,  2009 Nissan-Datsun Altima V6-3.5L.

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