AutoCodes – Generic – B2420

B2420 Code - Power Liftgate/Trunk Sensor 2 Invalid

Quick Answer

When the power liftgate moves in the close direction, the Liftgate/Trunk Module (LTM) monitors the pinch strips and motor position sensor for obstacle detection. Common causes include Liftgate alignment, Faulty Power Liftgate/Trunk Sensor 2, Power Liftgate/Trunk Sensor 2 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: B2420 indicates Power Liftgate/Trunk Sensor 2 Invalid.
Common causes: Common causes include Liftgate alignment, Faulty Power Liftgate/Trunk Sensor 2, Power Liftgate/Trunk Sensor 2 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 2,947

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 Dec 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2420 Description

When the power liftgate moves in the close direction, the Liftgate/Trunk Module (LTM) monitors the pinch strips and motor position sensor for obstacle detection. If the LTM detects an obstacle, it reverses the power liftgate. The LTM monitors the left and right pinch strips and if either pinch strip is pressed the LTM reverses the power liftgate. The LTM monitors the position sensor feedback for position and movement. If the LTM is unable to determine the liftgate position or the movement indicates an obstacle the LTM reverses the power liftgate. The LTM also monitors the power liftgate latch status once the liftgate closes to a secondary latch position. If the liftgate is unable to obtain a primary latch position the LTM aborts the power close.

OBDII Code B2420 - Power Liftgate/Trunk Sensor 2 Invalid - AutoCodes.com — B2420 Code - Power Liftgate/Trunk Sensor 2 Invalid

What does this mean?

What are the Possible Causes of the DTC B2420?

Liftgate alignment
Faulty Power Liftgate/Trunk Sensor 2
Power Liftgate/Trunk Sensor 2 harness is open or shorted
Power Liftgate/Trunk Sensor 2 circuit poor electrical connection
Faulty Power liftgate latch
Faulty Power liftgate motor
Faulty Liftgate/Trunk Module (LTM)

How to Fix the DTC B2420?

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 B2420 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 B2420 code?

Need more information on how to fix the B2420 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2420 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2420 Ford — Power Liftgate/Trunk Sensor 2 Invalid
B2420 Infiniti — Automatic Back Door Close Switch
B2420 Lexus — Adaptive Front-lighting System ECU Malfunction
B2420 Lincoln — Power Liftgate/Trunk Sensor 2 Invalid
B2420 Mercury — Power Liftgate/Trunk Sensor 2 Invalid
B2420 Nissan — Automatic Back Door Close Switch
B2420 Toyota — Adaptive Front-lighting System ECU 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 B2420 Code

1. What are common symptoms of OBDII code B2420 (Power Liftgate/Trunk Sensor 2 Invalid)?

- Common symptoms include the power liftgate or trunk not opening or closing properly, warning lights on the dashboard, and error messages related to the liftgate sensor.

2. What can cause OBDII code B2420 to trigger?

- This code is typically triggered by a malfunction or failure of the sensor 2 in the power liftgate or trunk system, which may be due to wiring issues, sensor damage, or a faulty control module.

3. How can I diagnose the cause of OBDII code B2420?

- Diagnosis usually involves inspecting the wiring and connections related to the power liftgate sensor 2, checking the sensor for physical damage, and using a diagnostic scanner to identify the specific issue.

4. Can I still use the power liftgate or trunk if OBDII code B2420 is present?

- In some cases, the power liftgate or trunk may still function manually even with the code present, but it's recommended to have the issue fixed to avoid potential safety hazards or further damage.

5. Is it safe to drive with OBDII code B2420 active?

- Driving with this code should not pose an immediate safety risk, but it's important to address the underlying issue promptly to ensure the proper functioning of the power liftgate or trunk system.

6. Are there any DIY repair tips for fixing OBDII code B2420?

- DIY repair tips may include checking and repairing any damaged wiring, replacing the faulty sensor 2, or resetting the system by disconnecting the battery for a few minutes.

7. How much does it typically cost to repair OBDII code B2420?

- The cost of repair can vary depending on the cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

8. Can OBDII code B2420 be intermittent or permanent?

- This code can appear as an intermittent issue, especially if the sensor 2 problem is sporadic, but it may become permanent if the underlying cause is not addressed.

9. Will resetting the OBDII system clear code B2420?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue with the power liftgate sensor 2 is not fixed, the code is likely to return.

10. How can I prevent OBDII code B2420 from recurring?

- To prevent the code from recurring, it's essential to address any wiring issues promptly, perform regular maintenance on the power liftgate system, and address any sensor or control module problems as soon as they arise.