AutoCodes – Nissan – B2126 Nissan

B2126 Nissan Code - Detention Switch

Quick Answer

Detention switch is installed on Automatic Transmission (AT) device. Common causes include Faulty Detention Switch, Detention Switch harness is open or shorted, Detention Switch circuit poor electrical connection. 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: B2126 Nissan indicates Detention Switch.
Common causes: Common causes include Faulty Detention Switch, Detention Switch harness is open or shorted, Detention Switch circuit poor electrical connection.
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 12,817

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 Sep 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2126 Nissan Description

Detention switch is installed on Automatic Transmission (AT) device. It is turned OFF when the AT selector lever is in Park (P) position. The driver seat control unit judges that the AT selector lever is in P position if continuity does not exist in this circuit.

OBDII Code B2126 Nissan - Detention Switch - AutoCodes.com — B2126 Nissan Code - Detention Switch

What does this mean?

What are the Possible Causes of the DTC B2126 Nissan?

Faulty Detention Switch
Detention Switch harness is open or shorted
Detention Switch circuit poor electrical connection

How to Fix the DTC B2126 Nissan?

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 B2126 Nissan 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 B2126 Nissan Code

1. What is OBDII code B2126 in a Nissan related to the Detention Switch?

When OBDII code B2126 appears in a Nissan, it typically indicates a problem with the Detention Switch, which is responsible for detecting whether the vehicle is in gear.

2. What are the common symptoms of a B2126 Detention Switch issue in a Nissan?

Common symptoms of a B2126 Detention Switch issue in a Nissan may include the inability to start the vehicle, the gear shifter feeling stuck, or the vehicle not recognizing when it is in park.

3. What are the possible causes of OBDII code B2126 in a Nissan?

Possible causes of OBDII code B2126 in a Nissan include a faulty Detention Switch, damaged wiring or connectors related to the switch, or a malfunction in the vehicle's transmission control module.

4. How can I diagnose a B2126 Detention Switch issue in my Nissan?

Diagnosing a B2126 Detention Switch issue in a Nissan typically involves using an OBDII scanner to read the specific error code, checking the wiring and connectors around the Detention Switch, and testing the switch itself for proper functionality.

5. Can I drive my Nissan with an unresolved B2126 Detention Switch problem?

It is not recommended to drive your Nissan with an unresolved B2126 Detention Switch problem, as it may lead to safety issues or further damage to the vehicle's transmission system.

6. How can I repair a B2126 Detention Switch issue in my Nissan?

Repairing a B2126 Detention Switch issue in a Nissan may involve replacing the Detention Switch itself, repairing any damaged wiring or connectors, or resetting the transmission control module.

7. Are there any DIY tips for fixing a B2126 Detention Switch problem in a Nissan?

While some basic troubleshooting steps can be taken, such as checking for loose connections or damaged wiring, it is recommended to have a professional mechanic diagnose and repair B2126 Detention Switch issues in a Nissan.

8. How much does it cost to repair a B2126 Detention Switch problem in a Nissan?

The cost of repairing a B2126 Detention Switch problem in a Nissan can vary depending on the specific issue, labor rates, and the cost of any necessary parts. It is advisable to obtain quotes from multiple mechanics or repair shops.

9. Can a B2126 Detention Switch issue in a Nissan cause other problems in the vehicle?

A B2126 Detention Switch issue in a Nissan may interfere with the proper operation of the transmission system, potentially leading to other related issues such as gear shifting problems or difficulty starting the vehicle.

10. Is it possible to prevent a B2126 Detention Switch problem in my Nissan?

While some Detention Switch issues may be unavoidable, regular maintenance and inspections of the transmission system can help detect potential problems early and prevent more serious issues like a B2126 code from occurring.