AutoCodes – Mazda – C1236 Mazda

C1236 Mazda Code - Speed Wheel Left Rear Input Signal Missing

Quick Answer

The Anti-Lock Brake System (ABS) Module receives wheel speed readings from each wheel speed sensor and processes this information to determine if an ABS event is necessary. Common causes include Faulty Left Rear ABS Sensor, Left Rear ABS Sensor harness is open or shorted, Left Rear ABS Sensor 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: C1236 Mazda indicates Speed Wheel Left Rear Input Signal Missing.
Common causes: Common causes include Faulty Left Rear ABS Sensor, Left Rear ABS Sensor harness is open or shorted, Left Rear ABS Sensor 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 5,614

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 28, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C1236 Mazda Description

The Anti-Lock Brake System (ABS) Module receives wheel speed readings from each wheel speed sensor and processes this information to determine if an ABS event is necessary. The wheel speed sensor detects the magnetic field of the sensor ring as it passes the face of the active wheel speed sensor.
The active wheel speed sensor generates a signal that is sent to the ABS module. The wheel speed sensor circuitry connects to the ABS module through 2 wires and a connector at each wheel speed sensor. When the ignition is turned to the RUN position, the ABS module carries out a self-test by sending a reference voltage to all of the wheel speed sensors through their circuitry to determine if they are functional.
The ABS module continuously monitors and compares the rotational speed of each wheel and when it detects an impending wheel lock, modulates the brake pressure to the appropriate brake caliper. This is accomplished by triggering the hydraulic control unit (HCU) to open and close the appropriate solenoid valves. Once the affected wheel returns to normal speed, the ABS module returns the solenoid valves to their normal position and normal (base) braking resumes.

OBDII Code C1236 Mazda - Speed Wheel Left Rear Input Signal Missing - AutoCodes.com — C1236 Mazda Code - Speed Wheel Left Rear Input Signal Missing

What does this mean?

What are the Possible Causes of the DTC C1236 Mazda?

Faulty Left Rear ABS Sensor
Left Rear ABS Sensor harness is open or shorted
Left Rear ABS Sensor circuit poor electrical connection
Faulty Wheel Speed Sensor
Wheel bearing

How to Fix the DTC C1236 Mazda?

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

There is factory service bulletin for the following Lincoln models:

2002 Lincoln Aviator
2003 Lincoln Aviator
2004 Lincoln Aviator

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1236 Mazda 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 C1236 Mazda code?

Need more information on how to fix the C1236 Mazda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1236 Mazda code diagnosed by a professional: Find a repair shop in your area

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 C1236 Mazda Code

1. What are the common symptoms of OBDII code C1236 in a Mazda related to the Speed Wheel Left Rear Input Signal Missing?

- Common symptoms include the ABS warning light illuminated on the dashboard, inaccurate speedometer readings, and potential issues with the vehicle's stability control system.

2. What can cause the Speed Wheel Left Rear Input Signal Missing error code C1236 in a Mazda?

- Possible causes include a faulty wheel speed sensor on the left rear wheel, damaged wiring or connectors leading to the sensor, or a malfunction in the ABS module.

3. How can I diagnose the Speed Wheel Left Rear Input Signal Missing code C1236 in my Mazda?

- To diagnose this issue, you can use an OBDII scanner to retrieve the specific error code. Additionally, visually inspect the wiring and connectors leading to the left rear wheel speed sensor for any signs of damage.

4. Is it safe to continue driving my Mazda with the C1236 error code related to the Speed Wheel Left Rear Input Signal Missing?

- It is not recommended to drive the vehicle with this error code present, as it can affect the proper functioning of the ABS system and compromise vehicle stability under certain driving conditions.

5. How can I repair the Speed Wheel Left Rear Input Signal Missing code C1236 in my Mazda?

- The most common repair involves replacing the faulty left rear wheel speed sensor. Ensure that the wiring and connectors are in good condition before installing the new sensor.

6. Can weather conditions or road debris trigger the C1236 error code in a Mazda?

- Yes, extreme weather conditions or road debris can potentially damage the wheel speed sensor or its wiring, leading to the Speed Wheel Left Rear Input Signal Missing code.

7. Will resetting the OBDII code C1236 in my Mazda make the issue disappear permanently?

- Resetting the code may temporarily clear the error, but if the underlying issue such as a faulty sensor or wiring problem persists, the code is likely to reappear.

8. Can a DIY enthusiast without specialized tools repair the Speed Wheel Left Rear Input Signal Missing code C1236 in a Mazda?

- While some basic automotive knowledge is required, replacing the wheel speed sensor or repairing wiring issues related to this code can be done by a DIY enthusiast with the right tools and precautions.

9. How much does it typically cost to repair the C1236 error code in a Mazda at a professional auto repair shop?

- The cost of repairing the Speed Wheel Left Rear Input Signal Missing code can vary depending on the exact cause and labor rates, but it generally ranges from $150 to $300 at a professional auto repair shop.

10. Can neglecting the C1236 error code affect other systems in my Mazda besides the ABS and stability control?

- Ignoring the Speed Wheel Left Rear Input Signal Missing code can potentially impact other systems that rely on the wheel speed sensor data, such as traction control and electronic stability control.