P1106
BMWManifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage
Medium SeverityThis code indicates that the engine control module (ECM) has detected an intermittent high voltage signal from the Manifold Absolute Pressure (MAP) sensor. This typically means the sensor is sending readings that are too high or inconsistent, which can lead to incorrect fuel calculations and poor engine performance.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is turned off and cool before working on any engine components. Disconnect the negative battery terminal before performing any electrical repairs to prevent accidental shorts or injury. Use appropriate personal protective equipment.
Common Symptoms
- Check Engine Light illuminated
- Rough idle
- Poor acceleration or loss of power
- Reduced fuel economy
- Engine hesitation or stalling
- Black smoke from the exhaust (due to rich fuel mixture)
Common Causes
- Faulty Manifold Absolute Pressure (MAP) sensor
- Damaged or corroded wiring or connectors to the MAP sensor
- Vacuum leaks in the intake manifold
- Blocked or restricted MAP sensor vacuum line (if applicable)
- Issue with the Engine Control Module (ECM) (less common)
Frequently reported on: BMW 3 Series (E46, E90) 2001-2011, BMW 5 Series (E39, E60) 2000-2010, BMW X5 (E53, E70) 2002-2013, BMW Z4 (E85) 2003-2008
Diagnostic Steps
- Locate the MAP sensor, typically on the intake manifold or near the throttle body.
- Inspect the electrical connector and wiring for any signs of damage, corrosion, or loose connections. Clean any corrosion with electrical contact cleaner.
- Carefully disconnect the MAP sensor electrical connector.
- Remove the MAP sensor (usually held by one or two bolts or a clip) and inspect its port for carbon buildup or debris. Clean if necessary.
- Replace the old MAP sensor with a new, OEM quality replacement part. Ensure it is securely installed.
- Reconnect the electrical connector firmly.
- Clear the P1106 code using an OBD-II scanner and test drive the vehicle to see if the code returns.
👨🔧 When to Call a Professional
If after inspecting wiring and replacing the MAP sensor the code persists, it may indicate a deeper electrical issue or a problem with the engine control module (ECM) itself. At this point, it is best to consult a professional BMW technician for advanced diagnostics.
Commonly Asked Questions
What does 'intermittent high voltage' mean for my MAP sensor?
It means the sensor is sending sporadic or inconsistent readings that are higher than expected to the engine's computer, causing incorrect air-fuel mixture calculations.
Can I drive with a P1106 code?
While you might be able to drive, it's not recommended for long. The engine's performance will be compromised, fuel economy will suffer, and there's a risk of damage to other components like the catalytic converter due to incorrect fuel mixtures.
Is a P1106 code always caused by a bad MAP sensor?
Not always. While a faulty MAP sensor is the most common cause, damaged wiring, connector issues, vacuum leaks in the intake system, or even a problem with the Engine Control Module (ECM) can also trigger this code.
How do I test my MAP sensor to confirm it's faulty?
You can test a MAP sensor using a multimeter to check for proper voltage output across different vacuum levels, or by monitoring its live data readings with an advanced OBD-II scanner while the engine is running or being revved.
Will cleaning the MAP sensor fix the P1106 code?
Sometimes. If the sensor port or sensing element is merely obstructed by carbon buildup, cleaning might restore proper function. However, if the sensor itself is internally faulty, cleaning will not resolve the issue and replacement will be necessary.