P1520 on 2000-2003 BMW M5 — Intake Manifold Runner Control Circuit Fault
1 vehicles · 1 makes · $900-$3,000 repair
Most Reported On
P1520 is an OBD-II diagnostic trouble code meaning “Intake Manifold Runner Control Circuit Fault.” This manufacturer-specific code (common on Ford) indicates a circuit fault in the Intake Manifold Runner Control (IMRC) system, which uses motorized or vacuum-actuated flaps in the intake to vary airflow length for better low- and high-RPM performance. The computer detected that the IMRC actuator circuit is open, shorted, or not responding as commanded. You may notice reduced power, hesitation, or poor throttle response, though some drivers feel nothing. It is generally an electrical or actuator/linkage issue rather than internal engine damage. This code is most commonly reported on 2000-2003 BMW M5, with repair costs ranging from $900 to $3,000.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P1520, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does P1520 mean?
P1520 stands for "Intake Manifold Runner Control Circuit Fault." This manufacturer-specific code (common on Ford) indicates a circuit fault in the Intake Manifold Runner Control (IMRC) system, which uses motorized or vacuum-actuated flaps in the intake to vary airflow length for better low- and high-RPM performance. The computer detected that the IMRC actuator circuit is open, shorted, or not responding as commanded. You may notice reduced power, hesitation, or poor throttle response, though some drivers feel nothing. It is generally an electrical or actuator/linkage issue rather than internal engine damage.
What are the most common causes of P1520?
The most common causes of P1520 are: Faulty IMRC actuator or motor, Open or shorted IMRC wiring harness, Poor or corroded electrical connection at the actuator, Stuck, broken, or seized runner flaps/linkage, Carbon buildup binding the runner plates, Faulty ECM/PCM driver (less common). The specific cause varies by vehicle.
How much does it cost to fix P1520?
Repair costs for P1520 range from $900 to $3,000, depending on the vehicle and root cause.
Which vehicles are affected by P1520?
Au7o has documented P1520 across 1 vehicle models from 1 manufacturers: BMW.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.