AutoCodes – Lexus – B2788 Lexus

B2788 Lexus 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 Lexus 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.

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Code Popularity 4,842

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jan 16, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2788 Lexus 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 Lexus - IG2 Signal Malfunction - AutoCodes.com — B2788 Lexus Code - IG2 Signal Malfunction

What does this mean?

What are the Possible Causes of the DTC B2788 Lexus?

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 Lexus?

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 Lexus 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.

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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 Lexus Code

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

Symptoms may include difficulty starting the vehicle, intermittent stalling, and issues with the ignition system.

2. What are the potential causes of OBDII code B2788 in a Lexus?

Possible causes include a faulty ignition switch, damaged wiring or connectors in the ignition circuit, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose OBDII code B2788 in my Lexus?

Diagnosis typically involves using a scan tool to retrieve the trouble code, performing a visual inspection of the ignition system components, and testing the integrity of the wiring and connectors.

4. Can I drive my Lexus with OBDII code B2788 present?

It is not recommended to drive your Lexus with this code active, as it may lead to potential safety hazards or further damage to the vehicle.

5. How can I repair OBDII code B2788 in my Lexus?

Repair options may include replacing the ignition switch, repairing or replacing damaged wiring, or reprogramming the ECM. It is advisable to consult a professional mechanic for an accurate diagnosis and proper repair.

6. Are there any DIY tips for addressing OBDII code B2788 in a Lexus?

While basic troubleshooting like checking for loose connections or damaged wires can be done by DIY enthusiasts, complex repairs or component replacements should be handled by a qualified technician.

7. Is OBDII code B2788 a serious issue in a Lexus?

Yes, this code should be addressed promptly to prevent potential safety risks and avoid further damage to the vehicle's electrical system.

8. Can a faulty battery cause OBDII code B2788 to appear in a Lexus?

While a weak or failing battery could potentially lead to electrical issues, the specific cause of this code is typically related to the ignition system components.

9. Will resetting the trouble codes make OBDII code B2788 disappear?

Resetting the codes may temporarily clear the error, but the underlying issue causing the code will likely reappear unless properly diagnosed and repaired.

10. How much does it cost to fix OBDII code B2788 in a Lexus?

The cost of repair can vary depending on the exact cause of the issue, the labor rates in your area, and whether any parts need to be replaced. It is advisable to get a few quotes from reputable mechanics to compare prices.