AutoCodes – Generic – P1257

P1257 Code - VTEC System Malfunction

Quick Answer

The VTEC system, in conjunction with the Engine Control Module (ECM), activates the VTEC solenoid valve to control oil pressure to the VTEC mechanism that is installed in the valve system to switch valve timing between Low and High. Common causes include Engine oil level low, Low engine oil pressure, Blocked oil passage. 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: P1257 indicates VTEC System Malfunction.
Common causes: Common causes include Engine oil level low, Low engine oil pressure, Blocked oil passage.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 26,245

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 24, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1257 Description

OBDII Code P1257 - VTEC System Malfunction - AutoCodes.com — P1257 Code - VTEC System Malfunction

What does this mean?

What are the Possible Causes of the DTC P1257?

Engine oil level low
Low engine oil pressure
Blocked oil passage
Faulty VCT oil control valve

How to Fix the DTC P1257?

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 P1257 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 P1257 code?

Need more information on how to fix the P1257 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1257 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1257 Acura — VTEC System Malfunction
P1257 Audi — Engine Coolant System Valve Open
P1257 Buick — Supercharger System Overboost
P1257 Cadillac — Supercharger System Overboost
P1257 Chevrolet — Supercharger System Overboost
P1257 Ford — Pedal Correlation PDS2 and HPDS
P1257 GMC — Supercharger System Overboost
P1257 Honda — VTEC System Malfunction
P1257 Volkswagen — Engine Coolant System Valve Open

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.