Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected a problem with the part that helps control how air goes into the engine. It's like if a toy's moving part got stuck and couldn't move properly.
The DISA valve adjusts the intake manifold runner length to optimize engine performance. A 'control circuit low' code indicates the electrical circuit controlling this valve is not functioning properly, likely due to a low voltage or a short circuit.
The P1512 code is triggered when the Engine Control Module (ECM) detects a low voltage condition in the DISA valve control circuit. The DISA valve is responsible for varying the length of the intake manifold runners to improve engine efficiency and performance. A low circuit condition can be caused by wiring issues, a faulty DISA valve, or a problem with the ECM.
• Check Engine Light is on
• Reduced engine performance
• Poor fuel economy
• Faulty DISA valve
• Wiring issues such as shorts or open circuits
• Faulty Engine Control Module (ECM)
DISA: Differentiated Intake Manifold
ECM: Engine Control Module
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Test the DISA valve for proper operation.
• Repair or replace damaged wiring and connectors.
• Replace the faulty DISA valve.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• BMW 3 Series
• BMW 5 Series
• BMW X5
• Regularly inspect and maintain engine wiring.
• Keep the intake system clean.
• Perform regular diagnostic checks.
Engine Performance
• Have the car inspected by a professional mechanic.
• Avoid driving aggressively until the issue is resolved.
Check with your vehicle manufacturer for warranty coverage on engine components.
P1512 is a common code in vehicles equipped with variable intake manifold systems, particularly in models with higher mileage.
Moderate – It is recommended to address this issue soon to avoid potential engine performance problems.
Driving with a malfunctioning intake system can lead to decreased performance and increased emissions. Addressing the issue promptly is advised.
• Engine at operating temperature
• Vehicle at idle
The DISA valve is typically located on the intake manifold, which is found on the top or side of the engine.
Q: What happens if I ignore the P1512 code?
A: Ignoring this code can lead to reduced engine performance and increased fuel consumption.
Q: Can I drive my car with a P1512 code?
A: While the car may still be drivable, it's best to fix the issue to maintain optimal performance and efficiency.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.