P0990: P0990: Transmission Advanced System - Pressure Control Solenoid 'A' Circuit Low

on 2018 BMW X5

Fix Cost

$100 - $500

Parts & Labor

Difficulty

3/5

1-2 hours

DIY Possible?

❌ No

Pro recommended

Your Vehicle

2018 BMW

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Important for 2018 BMW X5 Owners

Before starting repairs, verify which engine your 2018 BMW X5 has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does P0990 Mean on 2018 BMW X5?

The transmission control module (TCM) has detected a low voltage signal from the pressure control solenoid 'A' circuit, which may indicate a problem with the solenoid, wiring, or TCM.

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Symptoms

• Transmission slipping
• hesitation
• or refusal to engage gears
• unusual noises
• or illumination of the check engine light.

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Common Causes

• Faulty pressure control solenoid 'A'
• wiring issues
• TCM malfunction
• or low transmission fluid level.

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How to Fix P0990 on 2018 BMW X5

1. Check transmission fluid level and top off as necessary. 2. Inspect and clean or replace the pressure control solenoid 'A' circuit wiring. 3. Test the solenoid with a multimeter to ensure proper voltage and resistance. 4. Update the TCM software if necessary. 5. Replace the pressure control solenoid 'A' if faulty.

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