What Does P1593 Mean?
This code indicates an electrical fault in the DISA (Differentiated Intake System Actuator) control circuit, commonly found on BMW engines. The DISA valve varies intake runner length to optimize torque across the RPM range. An electrical fault in its control circuit means the PCM cannot command the valve, resulting in reduced mid-range torque and potentially a rattling noise from a stuck or loose valve flap.
Common Causes
30%
Failed DISA valve actuator motor or solenoid
25%
Broken DISA valve flap pin causing mechanical failure that stresses the circuit
20%
Wiring or connector fault at the DISA valve
15%
Short circuit in the DISA control wiring harness
10%
PCM driver circuit failure for the DISA output
Diagnostic Steps
1
Inspect the DISA valve connector for corrosion, oil contamination, and proper pin engagement.
2
Measure the DISA actuator resistance at the connector; compare to the manufacturer specification (typically 20–50 ohms for the solenoid type).
3
Command the DISA valve on and off using the scan tool bi-directional control; listen for audible clicking and verify operation.
4
Remove the DISA valve and physically inspect the internal flap for breakage—BMW DISA valves are notorious for broken flap pins that can be ingested by the engine.
5
Check the wiring from the PCM to the DISA connector for opens or shorts to ground.
6
Replace the DISA valve assembly if the actuator or flap is damaged; use an updated design if available.
Estimated Repair Cost
$200 - $500
Parts + labor, varies by vehicle and location
This code indicates an electrical fault in the DISA (Differentiated Intake System Actuator) control circuit, commonly found on BMW engines. The DISA valve varies intake runner length to optimize torque across the RPM range. An electrical fault in its control circuit means the PCM cannot command the ...
The most common cause of P1593 (DISA Control Circuit Electrical) is: Failed DISA valve actuator motor or solenoid
Typical repair costs for P1593 range from $200 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Not an immediate safety hazard. However, a broken DISA flap pin can be ingested into the engine causing catastrophic internal damage. If a rattling noise is present from the intake, cease driving and inspect immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1593 to identify the root cause.
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Quick Info
Category
Powertrain
System
Intake Manifold / Variable Runner
Difficulty
Type
Manufacturer
Recommended Tools
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