AutoCodes – Generic – C1257

C1257 Code - Power Supply Drive Circuit

Quick Answer

The Master Cylinder Solenoid (Skid Control ECU) monitors the Brake Booster Pump Assembly. Common causes include Faulty Brake Booster Pump Assembly, Brake Booster Pump Assembly harness is open or shorted, Brake Booster Pump 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: C1257 indicates Power Supply Drive Circuit.
Common causes: Common causes include Faulty Brake Booster Pump Assembly, Brake Booster Pump Assembly harness is open or shorted, Brake Booster Pump 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 9,568

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 31, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1257 Description

The Master Cylinder Solenoid (Skid Control ECU) monitors the Brake Booster Pump Assembly. The Master Cylinder Solenoid (Skid Control ECU) sets the OBDII code when the Brake Booster Pump Assembly is not to factory specifications.

OBDII Code C1257 - Power Supply Drive Circuit - AutoCodes.com — C1257 Code - Power Supply Drive Circuit

What does this mean?

What are the Possible Causes of the DTC C1257?

Faulty Brake Booster Pump Assembly
Brake Booster Pump Assembly harness is open or shorted
Brake Booster Pump Assembly circuit poor electrical connection
Faulty Master Cylinder Solenoid (Skid Control ECU)

How to Fix the DTC C1257?

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 C1257 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 C1257 code?

Need more information on how to fix the C1257 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1257 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1257 Lexus — Power Supply Drive Circuit
C1257 Scion — Power Supply Drive Circuit
C1257 Toyota — Power Supply Drive Circuit

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 C1257 Code

1. What does OBDII code C1257 mean?

C1257 indicates a problem with the power supply drive circuit, often related to the vehicle's ABS or traction control system.

2. What are the common symptoms of code C1257?

Symptoms may include an illuminated ABS or traction control warning light, loss of ABS functionality, and reduced stability control performance.

3. What causes the C1257 code to appear?

Common causes include a faulty ABS module, damaged wiring or connectors in the power supply circuit, or a weak vehicle battery.

4. Can a low battery trigger the C1257 code?

Yes, a low or failing battery can cause insufficient power supply to the ABS system, triggering this code.

5. How is code C1257 diagnosed?

Technicians typically use a scan tool to confirm the code, then inspect the ABS module, wiring, connectors, and battery for faults.

6. Can I still drive my car with a C1257 code?

While the car may be drivable, ABS and traction control systems may not function properly, increasing the risk of accidents in slippery conditions.

7. How do you fix the C1257 code?

Repairs may involve replacing the ABS module, repairing damaged wiring, or ensuring the battery and charging system are functioning correctly.

8. Can a blown fuse cause the C1257 code?

Yes, a blown fuse in the ABS power supply circuit could lead to this issue and should be checked during diagnosis.

9. How much does it cost to fix the C1257 code?

Repair costs vary based on the specific cause but can range from $100 for minor wiring repairs to over $1,000 for ABS module replacement.

10. Can a DIYer fix the C1257 code?

If the issue is minor, such as a loose connection or weak battery, a DIYer with basic tools might fix it, but more complex repairs may require professional assistance.