AutoCodes – Generic – B2788

B2788 Code - IG2 Signal Malfunction

Quick Answer

The Steering Lock ECU determines the on/off status of the engine switch through the IG2 signal circuit. Common causes include Blown IGN fuse, Faulty Steering Lock Actuator Assembly (Steering Lock ECU), Steering Lock Actuator Assembly harness is open or shorted. 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: B2788 indicates IG2 Signal Malfunction.
Common causes: Common causes include Blown IGN fuse, Faulty Steering Lock Actuator Assembly (Steering Lock ECU), Steering Lock Actuator Assembly harness is open or shorted.
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 2,399

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 Jan 16, 2023

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

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

Code B2788 Description

The Steering Lock ECU determines the on/off status of the engine switch through the IG2 signal circuit. After receiving an integration relay (IG2 relay) on signal, the steering lock ECU determines that the vehicle is moving. The steering lock ECU does not lock the steering when it receives the Integration Relay (IG2 relay) on the signal. This prevents the steering from being locked while the vehicle is moving. The diagnosis information of the steering lock ECU is transmitted to the Certification ECU (Smart Key ECU Assembly) as the Steering Lock ECU is not connected to the CAN communication system. The Diagnostic Trouble Code (DTC) is stored when the steering lock ECU detects an IG2 power supply malfunction.

OBDII Code B2788 - IG2 Signal Malfunction - AutoCodes.com — B2788 Code - IG2 Signal Malfunction

What does this mean?

What are the Possible Causes of the DTC B2788?

Blown IGN fuse
Faulty Steering Lock Actuator Assembly (Steering Lock ECU)
Steering Lock Actuator Assembly harness is open or shorted
Steering Lock Actuator Assembly circuit poor electrical connection

How to Fix the DTC B2788?

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 B2788 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 B2788 code?

Need more information on how to fix the B2788 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2788 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2788 Lexus — IG2 Signal Malfunction
B2788 Nissan — Electric Compressor Over Current
B2788 Scion — IG2 Signal Malfunction
B2788 Toyota — IG2 Signal Malfunction

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 B2788 Code

1. What are common symptoms of OBDII code B2788 (IG2 Signal Malfunction)?

Symptoms may include difficulty starting the vehicle, stalling, or intermittent loss of power.

2. What causes the OBDII code B2788 (IG2 Signal Malfunction)?

This code is often triggered by issues with the ignition switch, wiring faults, or a faulty ignition key cylinder.

3. How can I diagnose the OBDII code B2788 (IG2 Signal Malfunction)?

Diagnosis typically involves checking the ignition switch, inspecting related wiring for damage, and testing the ignition key cylinder.

4. Can a faulty battery cause the OBDII code B2788 (IG2 Signal Malfunction)?

Yes, a weak or failing battery can sometimes trigger this code due to insufficient power supply to the ignition system.

5. Is it safe to continue driving with the OBDII code B2788 (IG2 Signal Malfunction)?

It is not recommended to drive the vehicle with this code as it can lead to potential safety hazards and further damage if left unresolved.

6. How can I repair the OBDII code B2788 (IG2 Signal Malfunction)?

Repair may involve replacing the ignition switch, repairing damaged wiring, or replacing the ignition key cylinder as needed.

7. Are there any DIY tips for fixing the OBDII code B2788 (IG2 Signal Malfunction)?

DIY tips include ensuring a secure connection at the ignition switch, checking for loose or damaged wiring, and testing the ignition key cylinder.

8. Can weather conditions affect the OBDII code B2788 (IG2 Signal Malfunction)?

Extreme weather conditions, such as extreme cold or heat, can sometimes exacerbate issues related to this code due to temperature-sensitive components.

9. How long does it typically take to repair the OBDII code B2788 (IG2 Signal Malfunction)?

Repair time can vary depending on the exact cause of the code, but it may take a few hours to a full day to diagnose and fix the issue.

10. Will resetting the OBDII system clear the B2788 (IG2 Signal Malfunction) code?

Resetting the system may temporarily clear the code, but it is important to address the underlying issue to prevent the code from returning.

Discuss the causes and fixes for B2788 OBDII Code

Submit a New Comment

Code B2788 comments

No comments found for this page.

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.