AutoCodes – Generic – C1266

C1266 Code - Left Rear Outlet Valve Solenoid Malfunction

Quick Answer

The system relay is energized when the ignition is ON. Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module (EBCM) harness is open or shorted, Electronic Brake Control Module (EBCM) 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
C1266 indicates Left Rear Outlet Valve Solenoid Malfunction.
Common causes
Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module (EBCM) harness is open or shorted, Electronic Brake Control Module (EBCM) 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 31,855
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Aug 31, 2020
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Code C1266 Description

The system relay is energized when the ignition is ON. The system relay supplies voltage to the valve solenoids and the pump motor. This voltage is referred to as the system voltage. The Electronic Brake Control Module (EBCM) microprocessor activates the valve solenoids by grounding the control circuit. The Solenoid Valve circuit is internal to the EBCM. The EBCM sets the OBDII code when the commanded state of the driver and the actual state of the control circuit do not match.
OBDII Code C1266 - Left Rear Outlet Valve Solenoid Malfunction - AutoCodes.com
C1266 Code - Left Rear Outlet Valve Solenoid Malfunction

What are the Possible Causes of the DTC C1266?

  • Faulty Electronic Brake Control Module (EBCM)
  • Electronic Brake Control Module (EBCM) harness is open or shorted
  • Electronic Brake Control Module (EBCM) circuit poor electrical connection

How to Fix the DTC C1266?

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 C1266 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 C1266 code?

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Need Help with the Code?

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Information for Specific Makes

  • C1266 Buick β€” Left Rear Outlet Valve Solenoid Malfunction
  • C1266 Cadillac β€” Left Rear Outlet Valve Solenoid Malfunction
  • C1266 Chevrolet β€” Left Rear Outlet Valve Solenoid Malfunction
  • C1266 Ford β€” Anti-Lock Brake System Power Valve Relay Circuit Failure
  • C1266 GMC β€” Left Rear Outlet Valve Solenoid Malfunction
  • C1266 Jaguar β€” Anti-Lock Brake System Power Valve Relay Circuit Failure
  • C1266 Lincoln β€” Anti-Lock Brake System Power Valve Relay Circuit Failure
  • C1266 Mercury β€” Anti-Lock Brake System Power Valve Relay Circuit Failure
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 C1266 Code

1. What are common symptoms of OBDII code C1266 (Left Rear Outlet Valve Solenoid Malfunction)?

- Common symptoms include the illumination of the ABS warning light on the dashboard, decreased braking performance, and potential issues with the vehicle's stability control system.

2. What can cause the OBDII code C1266 to trigger?

- The code C1266 is typically triggered by a malfunction in the left rear outlet valve solenoid, which may be caused by electrical faults, wiring issues, or a faulty solenoid itself.

3. How serious is the OBDII code C1266 (Left Rear Outlet Valve Solenoid Malfunction)?

- While the vehicle may still be drivable with code C1266 triggered, it is important to address the issue promptly as it can affect the proper functioning of the vehicle's braking and stability control systems.

4. Can I continue driving my vehicle with the OBDII code C1266?

- It is recommended to avoid driving the vehicle with code C1266 triggered, as it may compromise the effectiveness of the braking system and stability control, potentially leading to unsafe driving conditions.

5. How can I diagnose and repair OBDII code C1266?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the specific fault codes, followed by inspecting the left rear outlet valve solenoid and its related components for any signs of damage or malfunction. Repair may involve replacing the faulty solenoid or addressing any wiring issues.

6. Is it possible to reset the OBDII code C1266 without repairing the issue?

- While it is possible to clear the fault code temporarily, it is not recommended to do so without addressing the underlying problem, as the code is likely to reappear and potentially lead to safety concerns.

7. Are there any DIY tips for fixing the OBDII code C1266 at home?

- DIY repairs for code C1266 may include checking and cleaning the electrical connectors, inspecting the wiring harness for damage, and replacing the left rear outlet valve solenoid if necessary. However, it is recommended to consult a professional if unsure.

8. How much does it typically cost to repair OBDII code C1266?

- The cost of repairing code C1266 can vary depending on the extent of the issue, the specific components needing replacement, and labor costs. It is advisable to obtain quotes from automotive repair shops for an accurate estimate.

9. Can a faulty left rear outlet valve solenoid cause other issues besides triggering code C1266?

- Yes, a malfunctioning left rear outlet valve solenoid can lead to braking system failures, compromised vehicle stability, and potentially trigger additional fault codes related to ABS and traction control systems.

10. How can I prevent OBDII code C1266 from recurring in the future?

- To prevent code C1266 from reoccurring, it is essential to address any underlying electrical issues, maintain proper care of the braking system components, and perform regular inspections and maintenance on the vehicle's ABS system.

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