AutoCodes – BMW – P0977 BMW

P0977 BMW Code - Shift Solenoid 'B' Control Circuit High

Quick Answer

The Engine Control Module (ECM) commands gear shifts by turning the shift solenoid valves "ON/OFF". Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty shift solenoid 'B' valve. 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: P0977 BMW indicates Shift Solenoid 'B' Control Circuit High.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty shift solenoid 'B' valve.
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 461

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 Aug 05, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0977 BMW Description

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".

OBDII Code P0977 BMW - Shift Solenoid 'B' Control Circuit High - AutoCodes.com — P0977 BMW Code - Shift Solenoid 'B' Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P0977 BMW?

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 DTC P0977 BMW?

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 P0977 BMW 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 P0977 BMW Code

1. What does the OBDII code P0977 mean on a BMW?

P0977 indicates a high electrical condition in the Shift Solenoid 'B' Control Circuit, which can affect the transmission's ability to shift gears properly.

2. What are the common symptoms of a P0977 code on a BMW?

Symptoms may include harsh or delayed shifting, failure to shift gears, transmission stuck in one gear, or the illumination of the check engine light.

3. What causes the P0977 code to appear on a BMW?

Common causes include a faulty shift solenoid 'B', damaged wiring or connectors in the circuit, transmission fluid contamination, or a malfunctioning transmission control module (TCM).

4. Can I drive my BMW with a P0977 code?

Driving with this code is not recommended, as it may lead to further transmission damage or unsafe driving conditions due to gear-shifting issues.

5. How do I diagnose the P0977 code on a BMW?

Diagnosis involves inspecting the wiring and connectors for damage, testing the shift solenoid 'B' for proper operation, and checking the transmission fluid for contamination or low levels.

6. How do I fix a P0977 code on my BMW?

Repairs may include replacing the shift solenoid 'B', repairing damaged wiring or connectors, flushing and replacing the transmission fluid, or reprogramming the TCM if necessary.

7. How much does it cost to fix the P0977 code on a BMW?

Repair costs can vary widely, ranging from $100 to $400 for solenoid replacement, and higher if additional components like the TCM or wiring harness need repairs.

8. Can dirty transmission fluid cause the P0977 code?

Yes, contaminated or degraded transmission fluid can cause solenoid malfunctions, triggering the P0977 code. A fluid flush may resolve the issue in some cases.

9. Do I need to replace the transmission to fix the P0977 code on a BMW?

In most cases, replacing the transmission is not necessary. The issue is typically resolved by repairing or replacing the faulty solenoid or addressing wiring issues.

10. Will clearing the P0977 code fix the problem?

Clearing the code will remove it temporarily, but the underlying issue must be resolved to prevent the code from returning.