This guide is customized for your 2018 BMW X5
P0991: P0991: Transmission Advanced System - Pressure Control Solenoid 'A' Circuit Low
on 2018 BMW X5
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 P0991 Mean on 2018 BMW X5?
Symptoms
- • Transmission slipping
- • hesitation
- • or hesitation during acceleration
- • unusual noises
- • or difficulty shifting gears.
Common Causes
- • Faulty Pressure Control Solenoid 'A'
- • clogged transmission filter
- • low transmission fluid level
- • or a faulty transmission pressure sensor.
How to Fix P0991 on 2018 BMW X5
1. Check transmission fluid level and top off as necessary. 2. Inspect and clean the transmission filter. 3. Replace the Pressure Control Solenoid 'A' if faulty. 4. Check and replace the transmission pressure sensor if necessary.
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Related Diagnostic Codes
Other codes that may appear with P0991
P0989: Transmission Advanced System - Torque Converter Clutch Solenoid Circuit Malfunction
P0990: Transmission Advanced System - Pressure Control Solenoid 'A' Circuit Low
P0992: Transmission Advanced System - Pressure Control Solenoid 'A' Performance
P0993: Transmission Advanced System - Pressure Control Solenoid 'A' Performance
💡 Why These Codes Are Related:
- • Similar Issues: Same root cause or component failure
- • Related Problems: Often occur together due to system interactions
- • Sequential Codes: Progressive failure stages or multiple sensors
- • Same System: Components within the same automotive system