AutoCodes – Generic – C1250

C1250 Code - Left Rear ISO Valve Circuit Failure

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Left Rear ISO Valve. Common causes include Faulty Left Rear ISO Valve, Left Rear ISO Valve harness is open or shorted, Left Rear ISO Valve 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: C1250 indicates Left Rear ISO Valve Circuit Failure.
Common causes: Common causes include Faulty Left Rear ISO Valve, Left Rear ISO Valve harness is open or shorted, Left Rear ISO Valve 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 18,702

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 30, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1250 Description

The Anti-Lock Brake System (ABS) Module monitors the Left Rear ISO Valve. The ABS Module sets the OBDII code when the Left Rear ISO Valve is not to factory specifications.

OBDII Code C1250 - Left Rear ISO Valve Circuit Failure - AutoCodes.com — C1250 Code - Left Rear ISO Valve Circuit Failure

What does this mean?

What are the Possible Causes of the DTC C1250?

Faulty Left Rear ISO Valve
Left Rear ISO Valve harness is open or shorted
Left Rear ISO Valve circuit poor electrical connection

How to Fix the DTC C1250?

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 C1250 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 C1250 code?

Need more information on how to fix the C1250 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1250 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1250 Buick — Lateral Acceleration Sensor Circuit High Voltage
C1250 Cadillac — Lateral Acceleration Sensor Circuit High Voltage
C1250 Chevrolet — Lateral Acceleration Sensor Circuit High Voltage
C1250 Ford — Left Rear ISO Valve Circuit Failure
C1250 GMC — Lateral Acceleration Sensor Circuit High Voltage
C1250 Lincoln — Left Rear ISO Valve Circuit Failure
C1250 Mazda — Left Right ABS Pressure Retention Solenoid Valve
C1250 Mercury — Left Rear ISO Valve 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 C1250 Code

1. What are common symptoms of OBDII code C1250 (Left Rear ISO Valve Circuit Failure)?

- Common symptoms include the traction control light or ABS light illuminating on the dashboard, poor handling or braking performance, and possible vehicle stability issues.

2. What are the potential causes of OBDII code C1250?

- The code C1250 may be triggered by a faulty left rear ISO valve, damaged wiring or connectors related to the valve, or issues with the ABS module.

3. How can I diagnose the cause of OBDII code C1250?

- Diagnosing the code typically involves using a diagnostic scanner to retrieve the specific fault codes, conducting a visual inspection of the left rear ISO valve and its wiring, and performing electrical tests to check for continuity and proper voltage.

4. Can I continue driving with OBDII code C1250 present?

- It is not recommended to continue driving with OBDII code C1250 active, as it can affect the vehicle's stability and braking performance. It is advisable to address the issue promptly.

5. How can I repair OBDII code C1250 (Left Rear ISO Valve Circuit Failure)?

- Repairing the code C1250 may involve replacing the left rear ISO valve, repairing or replacing damaged wiring or connectors, and resetting the fault codes using a diagnostic scanner.

6. Are there any DIY tips for addressing OBDII code C1250?

- DIY tips include checking for loose or damaged wiring around the left rear ISO valve, ensuring proper connections, and consulting the vehicle's service manual for specific troubleshooting steps.

7. Can weather or road conditions trigger OBDII code C1250?

- Harsh weather conditions or rough road surfaces can potentially contribute to triggering code C1250 by putting additional stress on the ABS system components.

8. How much does it typically cost to repair OBDII code C1250?

- The cost of repairing OBDII code C1250 can vary depending on the specific cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

9. Will OBDII code C1250 cause my vehicle to fail an emissions test?

- OBDII code C1250 is related to the ABS system and is not directly linked to emissions control. However, it is still important to address the issue to ensure safe vehicle operation.

10. Is it possible for OBDII code C1250 to reoccur after repair?

- If the underlying issue causing code C1250 is not properly addressed during the repair process, there is a possibility that the code may reoccur. It is crucial to diagnose and fix the root cause to prevent this.