AutoCodes – MINI – P0977 MINI

P0977 MINI 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 MINI 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 1,295

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Aug 05, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0977 MINI 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 MINI - Shift Solenoid 'B' Control Circuit High - AutoCodes.com — P0977 MINI Code - Shift Solenoid 'B' Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P0977 MINI?

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 MINI?

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 does this mean?

Code Tech Notes

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0977 MINI 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 MINI Code

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

P0977 indicates a high voltage issue in the Shift Solenoid 'B' control circuit, which affects the transmission's ability to shift gears properly.

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

Symptoms may include difficulty shifting gears, erratic or delayed shifting, the transmission stuck in one gear, or the check engine light illuminated.

3. What causes the P0977 code on a MINI?

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

4. Can driving with the P0977 code damage my MINI?

Yes, continuing to drive with this code can cause further damage to the transmission and may lead to more expensive repairs.

5. How do I diagnose the P0977 code on my MINI?

Diagnosis involves inspecting the shift solenoid 'B', checking the wiring and connectors for damage, testing the circuit for proper voltage, and verifying the transmission control module's functionality.

6. How is the P0977 code repaired on a MINI?

Repairs may include replacing the faulty shift solenoid 'B', repairing or replacing damaged wiring or connectors, updating or replacing the TCM, or refilling low transmission fluid.

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

Repair costs vary but typically range from $150 to $400 for parts and labor, depending on whether the solenoid, wiring, or TCM needs replacement.

8. Can low transmission fluid cause the P0977 code on a MINI?

Yes, low or dirty transmission fluid can affect solenoid operation and trigger the P0977 code.

9. Is the P0977 code specific to MINI vehicles?

No, P0977 is a generic OBDII code applicable to many vehicles, but the diagnosis and repair process may vary slightly between manufacturers.

10. Can I fix the P0977 code on my MINI myself?

If you have mechanical knowledge, you might be able to replace the solenoid or repair wiring. However, advanced diagnostics or TCM programming may require professional assistance.