Engine-Codes - Chevrolet - P0977 CHEVROLET

P0977 CHEVROLET Code - Shift Solenoid 'B' Open Or Short To Power

- Code Popularity: 6,324 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the P0977 CHEVROLET Code?

  • Low transmission fluid level
  • Dirty transmission fluid
  • Faulty shift solenoid 'B' valve
  • Shift solenoid 'B' valve harness or connectors
  • Shift solenoid 'B' valve circuit is open or shorted

|How to Fix the P0977 CHEVROLET Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the cost to diagnose the P0977 CHEVROLET code?

Labor: 1.0

The cost to diagnose the P0977 CHEVROLET code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P0977 CHEVROLET code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the P0977 CHEVROLET Code Mean?

The Powertrain Control Module (PCM) controls the ground signal for shift solenoid B to control the solenoid ON or OFF, according to transaxle and vehicle operation. When the solenoid is OFF, filtered line pressure to the solenoid is exhausted. When energized (ON), the exhaust port is blocked, stopping the exhaust of line pressure through the solenoid, and directing it into the solenoid B passage. Solenoid B fluid pressure is then fed to the 4-3 manual downshift valve and the 3-2 manual downshift valve.

Shift Solenoid 'B' Open Or Short To Power

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