AutoCodes – Infiniti – C1121 Infiniti

C1121 Infiniti Code - Front Left Output ABS Solenoid

Quick Answer

The control unit computes the wheel rotating speed by the signal sent from the sensor. Common causes include Faulty ABS Actuator/Electric Unit, ABS Actuator/Electric Unit harness is open or shorted, ABS Actuator/Electric Unit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C1121 Infiniti indicates Front Left Output ABS Solenoid.
Common causes: Common causes include Faulty ABS Actuator/Electric Unit, ABS Actuator/Electric Unit harness is open or shorted, ABS Actuator/Electric Unit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 7,590

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 16, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C1121 Infiniti Description

The control unit computes the wheel rotating speed by the signal sent from the sensor. Then it supplies a DC current to the actuator solenoid valve. It also controls ON-OFF operation of the solenoid valve relay and motor relay. If any electrical malfunction should be detected in the system, the control unit causes the warning lamp to turn on. In this condition, the ABS will be deactivated by the control unit, and the vehicle's brake system reverts to normal operation.
The ABS actuator and electric unit (control unit) contains: An electric motor and pump, Two relays, Eight solenoid valves ( each inlet and outlet for LH front, RH front, LH rear, RH rear), and ABS control unit.
These components control the hydraulic circuit that increases, holds or decreases hydraulic pressure to all or individual wheels. The ABS actuator and electric unit (control unit) cannot be disassembled and must be replaced as an assembly.

OBDII Code C1121 Infiniti - Front Left Output ABS Solenoid - AutoCodes.com — C1121 Infiniti Code - Front Left Output ABS Solenoid

What does this mean?

What are the Possible Causes of the DTC C1121 Infiniti?

Faulty ABS Actuator/Electric Unit
ABS Actuator/Electric Unit harness is open or shorted
ABS Actuator/Electric Unit poor electrical connection

How to Fix the DTC C1121 Infiniti?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The ABS has an electronic control unit to control major functions. The control unit accepts input signals from sensors and controls operation of the actuator. It is also important to check for conventional problems such as air leaks in the booster or lines, lack of brake fluid, or other problems with the brake system.
It is much more difficult to diagnose a problem that occurs intermittently rather than continuously. Most intermittent problems are caused by poor electrical connections or faulty wiring. In this case, careful checking of suspicious circuits may help prevent the replacement of good parts.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1121 Infiniti code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1121 Infiniti Code

1. What are the common symptoms of OBDII code C1121 in an Infiniti related to the Front Left Output ABS Solenoid?

The common symptoms include the ABS warning light illuminating on the dashboard, decreased braking performance, and potential traction control issues.

2. What is the typical cause of OBDII code C1121 in an Infiniti indicating an issue with the Front Left Output ABS Solenoid?

This code is often triggered by a malfunction or failure of the Front Left Output ABS solenoid within the vehicle's anti-lock braking system.

3. How can I diagnose the Front Left Output ABS Solenoid issue causing OBDII code C1121 in my Infiniti?

A diagnostic scanner can be used to retrieve the specific trouble code (C1121) and further testing of the ABS system, including the solenoid and related components, may be necessary.

4. What are the potential dangers of ignoring OBDII code C1121 related to the Front Left Output ABS Solenoid in an Infiniti?

Ignoring this code can lead to compromised braking performance, reduced vehicle stability, and increased risks of accidents due to potential ABS system failure.

5. Can I continue driving my Infiniti with OBDII code C1121 related to the Front Left Output ABS Solenoid?

It is not recommended to drive the vehicle with this code present, as it can affect the overall safety and performance of the braking system. Immediate attention and repair are advised.

6. Is it possible to repair the Front Left Output ABS Solenoid issue causing OBDII code C1121 in my Infiniti myself?

While some DIY enthusiasts may attempt the repair, it is recommended to seek professional help to accurately diagnose and fix the ABS solenoid issue to ensure proper functionality and safety.

7. How much does it typically cost to repair OBDII code C1121 related to the Front Left Output ABS Solenoid in an Infiniti?

The cost of repair can vary depending on the extent of the damage and the specific components that need to be replaced, but it typically ranges from a few hundred to a thousand dollars.

8. Can a faulty Front Left Output ABS Solenoid cause other ABS-related trouble codes to appear in an Infiniti?

Yes, a malfunctioning Front Left Output ABS solenoid can potentially trigger other ABS-related trouble codes in the vehicle's system, indicating broader issues with the anti-lock braking system.

9. Are there any preventive maintenance tips to avoid OBDII code C1121 in an Infiniti related to the Front Left Output ABS Solenoid?

Regularly inspecting and servicing the ABS system, including checking the condition of solenoids and sensors, can help prevent issues that may lead to the triggering of this trouble code.

10. How long does it typically take to repair the Front Left Output ABS Solenoid problem causing OBDII code C1121 in an Infiniti?

The repair time can vary based on the extent of the issue, availability of parts, and the specific diagnostic and repair processes involved, but it usually takes a few hours to a day to complete the repair.