AutoCodes – Chrysler – B1977 Chrysler

B1977 Chrysler Code - Power Liftgate Open Direction Sector Switch Performance

Quick Answer

The sector switch is essentially a park switch for the latch. Common causes include Binding Power Liftgate, Faulty Sector Switch Sense, Sector Switch Sense 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: B1977 Chrysler indicates Power Liftgate Open Direction Sector Switch Performance.
Common causes: Common causes include Binding Power Liftgate, Faulty Sector Switch Sense, Sector Switch Sense 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 4,192

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 Jul 31, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1977 Chrysler Description

The sector switch is essentially a park switch for the latch. When the latch is running a cinch or release operation, the switch is closed. After the cinch or release is complete, the PLGM will reverse direction of the latch until the switch is open.

OBDII Code B1977 Chrysler - Power Liftgate Open Direction Sector Switch Performance - AutoCodes.com — B1977 Chrysler Code - Power Liftgate Open Direction Sector Switch Performance

What does this mean?

What are the Possible Causes of the DTC B1977 Chrysler?

Binding Power Liftgate
Faulty Sector Switch Sense
Sector Switch Sense harness is open or shorted
Sector Switch Sense circuit poor electrical connection
Faulty Power Liftgate Latch
Faulty Power Liftgate Module

How to Fix the DTC B1977 Chrysler?

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 B1977 Chrysler 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 B1977 Chrysler Code

What does the OBDII code B1977 mean on a Chrysler vehicle?

1. The B1977 code indicates a problem with the Power Liftgate Open Direction Sector Switch, which monitors the liftgate's position and movement during operation. 2.

What are the common symptoms of the B1977 code?

Symptoms may include the liftgate not opening or closing properly, unusual noises from the liftgate mechanism, or the liftgate becoming stuck in one position. 3.

What causes the B1977 code to appear?

Common causes include a faulty sector switch, damaged wiring or connectors, misaligned liftgate components, or a malfunctioning liftgate motor. 4.

Can I still drive my Chrysler with the B1977 code active?

Yes, the vehicle is still drivable, but the power liftgate may not function correctly, which could be inconvenient or pose a safety risk if the liftgate opens unintentionally. 5.

How do I diagnose the B1977 code?

Diagnose the code by inspecting the liftgate sector switch, wiring, and connectors for damage or corrosion. Use a scan tool to confirm the code and test the functionality of the switch. 6.

How can I fix the B1977 code on my Chrysler?

Repairs may include replacing the sector switch, repairing or replacing damaged wiring, realigning the liftgate, or recalibrating the liftgate system using a scan tool. 7.

Is the B1977 code related to other liftgate issues?

Yes, it may be related to other liftgate component failures, such as the liftgate motor, latch, or control module. A thorough inspection is recommended. 8.

How much does it cost to fix the B1977 code?

Repair costs vary depending on the issue, but replacing the sector switch typically costs between $100 and $300, including parts and labor. 9.

Can I reset the B1977 code without repairs?

You can clear the code with a scan tool, but it will likely return if the underlying issue isn't resolved. 10.

What happens if I ignore the B1977 code?

Ignoring the code may lead to further damage to the liftgate system, increased repair costs, or potential safety hazards if the liftgate malfunctions.