AutoCodes – Generic – C1582

C1582 Code - Assist Map Number Mismatch

Quick Answer

When an incorrect ECM, an incorrect brake actuator assembly or an incorrect main body ECU is installed after the assist map has been written in the power steering ECU assembly, then Diagnostic Trouble Code (DTC) C1582/26 is stored because the data does not match the vehicle specifications. Common causes include Incorrect Engine Control Module (ECM), Incorrect Skid Control ECU (Brake Actuator Assembly), Incorrect Main Body ECU (Multiplex Network Body ECU). 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: C1582 indicates Assist Map Number Mismatch.
Common causes: Common causes include Incorrect Engine Control Module (ECM), Incorrect Skid Control ECU (Brake Actuator Assembly), Incorrect Main Body ECU (Multiplex Network Body ECU).
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 1,301

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 Feb 26, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1582 Description

OBDII Code C1582 - Assist Map Number Mismatch - AutoCodes.com — C1582 Code - Assist Map Number Mismatch

What does this mean?

What are the Possible Causes of the DTC C1582?

Incorrect Engine Control Module (ECM)
Incorrect Skid Control ECU (Brake Actuator Assembly)
Incorrect Main Body ECU (Multiplex Network Body ECU)
Faulty Power Steering ECU

How to Fix the DTC C1582?

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 C1582 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 C1582 code?

Need more information on how to fix the C1582 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1582 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1582 Lexus — Assist Map Number Mismatch
C1582 Scion — Assist Map Number Mismatch
C1582 Toyota — Assist Map Number Mismatch

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 C1582 Code

1. What are the common symptoms of OBDII code C1582 (Assist Map Number Mismatch)?

- Common symptoms may include rough idling, engine misfires, reduced power, and poor fuel efficiency.

2. What can cause the OBDII code C1582 to trigger?

- The code C1582 is typically triggered when there is a mismatch between the expected and actual values of the assist map number in the vehicle's system.

3. How serious is the OBDII code C1582 (Assist Map Number Mismatch)?

- While the code itself may not directly impact the drivability of the vehicle, it is essential to address it promptly to prevent potential issues with engine performance and emissions.

4. What are some possible repair tips for resolving OBDII code C1582?

- Common repair steps include checking and recalibrating the assist map number values, inspecting for any loose connections or damaged wiring, and ensuring the integrity of related sensors.

5. Can a DIY enthusiast fix the OBDII code C1582 issue at home?

- Depending on the root cause of the code, some DIY enthusiasts may be able to address the C1582 error by following repair procedures outlined in the vehicle's service manual or using OBDII diagnostic tools.

6. Will driving with the OBDII code C1582 (Assist Map Number Mismatch) cause further damage to the vehicle?

- Continuing to drive with the C1582 code present may lead to decreased engine performance and potential long-term issues, so it is advisable to address the problem as soon as possible.

7. How can a mechanic diagnose the OBDII code C1582 accurately?

- A mechanic can use a diagnostic scanner to retrieve the specific details of the C1582 error code, inspect the related components, and perform tests to pinpoint the exact cause of the assist map number mismatch.

8. Are there any recalls or technical service bulletins related to OBDII code C1582?

- It's recommended to check with the vehicle manufacturer or authorized service centers for any recalls or technical service bulletins related to the C1582 error code for specific models.

9. How much does it typically cost to repair the OBDII code C1582?

- The cost of repairing the C1582 error code can vary depending on the underlying cause, the extent of repairs needed, labor rates, and the price of any replacement parts required.

10. Can resetting the OBDII system clear the C1582 error code?

- Resetting the OBDII system may temporarily clear the C1582 code, but if the root cause of the issue is not addressed, the code is likely to reappear. It's essential to diagnose and fix the underlying problem.