AutoCodes – Toyota – C1421 Toyota

C1421 Toyota Code - Open or Short in Master Cylinder Pressure Sensor

Quick Answer

The Master Cylinder Pressure Sensor is connected to the Skid Control ECU (Brake Actuator Assembly). Common causes include Faulty Brake Actuator Assembly (Master Cylinder Pressure Sensor), Brake Actuator Assembly harness is open or shorted, Brake Actuator Assembly circuit 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: C1421 Toyota indicates Open or Short in Master Cylinder Pressure Sensor.
Common causes: Common causes include Faulty Brake Actuator Assembly (Master Cylinder Pressure Sensor), Brake Actuator Assembly harness is open or shorted, Brake Actuator Assembly circuit 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 14,577

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 Jan 22, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1421 Toyota Description

The Master Cylinder Pressure Sensor is connected to the Skid Control ECU (Brake Actuator Assembly). The Skid Control ECU monitors the Master Cylinder Pressure Sensor. The Skid Control ECU sets the Diagnostic Trouble Code (DTC) when the Master Cylinder Pressure Sensor is not to factory specifications.

OBDII Code C1421 Toyota - Open or Short in Master Cylinder Pressure Sensor - AutoCodes.com — C1421 Toyota Code - Open or Short in Master Cylinder Pressure Sensor

What does this mean?

What are the Possible Causes of the DTC C1421 Toyota?

Faulty Brake Actuator Assembly (Master Cylinder Pressure Sensor)
Brake Actuator Assembly harness is open or shorted
Brake Actuator Assembly circuit poor electrical connection

How to Fix the DTC C1421 Toyota?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1421 Toyota 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.

Need more information about the C1421 Toyota code?

Need more information on how to fix the C1421 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1421 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

C1421 2013 Toyota RAV4 — Open or Short in Master Cylinder Pressure Sensor
C1421 2014 Toyota RAV4 — Open or Short in Master Cylinder Pressure Sensor
C1421 2015 Toyota RAV4 — Open or Short in Master Cylinder Pressure Sensor
C1421 2016 Toyota RAV4 — Open or Short in Master Cylinder Pressure Sensor
C1421 2017 Toyota RAV4 — Open or Short in Master Cylinder Pressure Sensor
C1421 2018 Toyota RAV4 — Open or Short in Master Cylinder Pressure Sensor

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 C1421 Toyota Code

1. What does OBDII code C1421 mean on a Toyota?

Code C1421 indicates an open or short circuit in the master cylinder pressure sensor circuit, which is part of the vehicle's braking system.

2. What are the common symptoms of code C1421 in a Toyota?

Common symptoms include the ABS warning light or brake warning light illuminating, reduced braking performance, and issues with the ABS system.

3. What causes the C1421 code to appear in a Toyota?

Possible causes include a faulty master cylinder pressure sensor, damaged wiring or connectors in the sensor circuit, or an issue with the ABS control module.

4. Can I drive my Toyota with the C1421 code active?

While the vehicle may still be drivable, it is not recommended as braking performance and ABS functionality could be compromised, posing a safety risk.

5. How do I diagnose the C1421 code in my Toyota?

Start by visually inspecting the wiring and connectors for damage or corrosion, then use a multimeter to check for continuity in the circuit. A scan tool can also help test the ABS system and sensor functionality.

6. How is the C1421 code repaired on a Toyota?

Repairs may include replacing the master cylinder pressure sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ABS control module if necessary.

7. How much does it cost to fix the C1421 code on a Toyota?

Repair costs vary depending on the issue, but replacing the master cylinder pressure sensor can cost between $200 and $400, excluding labor costs.

8. Does a faulty master cylinder pressure sensor always trigger the C1421 code?

Not always. Wiring issues, connector problems, or faults in the ABS module can also trigger the C1421 code.

9. Can clearing the C1421 code solve the problem?

Clearing the code without addressing the underlying issue will not solve the problem. The code will likely return until the fault is properly repaired.

10. Is the C1421 code specific to Toyota vehicles?

While C1421 is commonly associated with Toyota vehicles, other manufacturers may use different codes for similar issues. Always refer to the specific vehicle's service manual for accurate diagnostics.