AutoCodes – Generic – C1131

C1131 Code - Engine Signal 2

Quick Answer

ABS actuator and electric unit (control unit) and ECM exchange the engine signal with CAN communication line. Common causes include Faulty Engine Control Module (ECM), Faulty ABS actuator and electric unit (control unit), Control Area Network (CAN) communication line. 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: C1131 indicates Engine Signal 2.
Common causes: Common causes include Faulty Engine Control Module (ECM), Faulty ABS actuator and electric unit (control unit), Control Area Network (CAN) communication line.
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 7,293

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 17, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code C1131 Description

ABS actuator and electric unit (control unit) and ECM exchange the engine signal with CAN communication line. Major engine components are malfunctioning.

OBDII Code C1131 - Engine Signal 2 - AutoCodes.com — C1131 Code - Engine Signal 2

What does this mean?

What are the Possible Causes of the DTC C1131?

Faulty Engine Control Module (ECM)
Faulty ABS actuator and electric unit (control unit)
Control Area Network (CAN) communication line
Blown ECM fuses

How to Fix the DTC C1131?

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 does this mean?

Code Tech Notes

The code means that the Anti-Lock Brake System (ABS) control unit has detected that there is problem with the Engine Control Module (ECM).

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1131 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 C1131 code?

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Need Help with the Code?

Get the C1131 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1131 Infiniti — Engine Signal 2
C1131 Nissan — Engine Signal 2

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.