Engine-Codes - Generic - P0977

P0977 Code - Shift Solenoid 'B' Control Circuit High

- Code Popularity: 24,054 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the P0977 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 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.

|P0977 code tech notes

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|What is the cost to diagnose the P0977 code?

Labor: 1.0

The cost to diagnose the P0977 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 code possible symptoms?

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

|What Does the P0977 Code Mean?

The Engine Control Module (ECM) commands gear shifts by turning the shift solenoid valves "ON/OFF". When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the engine light and stores the Diagnostic Trouble Code (DTC), and the ECM performs the fail-safe function and turns the other shift solenoids valves in good condition "ON/OFF".

Shift Solenoid 'B' Control Circuit High

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|P0977 code information for specific makes

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