P1106
VWThe Powertrain Control Module (PCM) detects an intermittent high voltage condition in the Manifold Absolute Pressure (MAP) sensor circuit, indicating a reading above specified parameters. This is a manufacturer-specific code for Volkswagen vehicles.
Medium SeverityThis code indicates an intermittent high voltage reading from the Manifold Absolute Pressure (MAP) sensor circuit, which provides information about engine load to the engine computer. This can lead to incorrect fuel delivery and ignition timing, affecting engine performance and potentially causing rough running.
⚠️ Before You Begin (Safety First)
Always ensure the engine is off and cool before working on any engine components. Disconnect the battery's negative terminal to prevent electrical shorts or accidental component activation. Be cautious when handling electrical connectors to avoid damage.
Common Symptoms
- Check Engine Light (CEL) illumination
- Rough idle
- Poor acceleration
- Reduced fuel economy
- Engine hesitation or stumbling
- Black smoke from exhaust
Common Causes
- Faulty Manifold Absolute Pressure (MAP) sensor
- Intermittent short to voltage in the MAP sensor circuit wiring
- Corroded or loose electrical connector to the MAP sensor
- Vacuum leaks affecting MAP sensor readings
- Faulty Powertrain Control Module (PCM) (rare)
Frequently reported on: VW Jetta 1999-2005, VW Golf 2000-2006, VW Passat 1998-2005, VW Beetle 1998-2005
Diagnostic Steps
- Locate the Manifold Absolute Pressure (MAP) sensor, typically on the intake manifold or connected via a vacuum line.
- Visually inspect the MAP sensor's electrical connector and wiring for any signs of corrosion, damage, or loose connections.
- Disconnect the MAP sensor electrical connector and inspect the pins for bends, corrosion, or contamination. Clean with electrical contact cleaner if necessary.
- Inspect any vacuum lines connected to the MAP sensor for cracks, leaks, or blockages.
- Reconnect the MAP sensor and ensure it is securely seated.
- If symptoms persist or return, consider replacing the MAP sensor as it is a common failure point for this code.
- After any repair, clear the trouble code using an OBD-II scanner and test drive the vehicle to confirm the fix.
👨🔧 When to Call a Professional
If the issue persists after inspecting wiring and replacing the MAP sensor, or if other fault codes are present, a professional diagnostic may be required to trace complex electrical faults within the engine harness or Powertrain Control Module (PCM).
Commonly Asked Questions
Can I drive with a P1106 code?
It is generally not recommended to drive for extended periods with this code as it can lead to poor engine performance, reduced fuel economy, and potential damage to other engine components over time.
Is a P1106 code expensive to fix?
The cost to fix a P1106 typically involves replacing the MAP sensor, which is a relatively inexpensive part. The labor is usually minimal if you perform the repair yourself or have a mechanic install it.
Where is the MAP sensor located on a VW?
The MAP sensor is usually located on the intake manifold or in a hose leading to it. Its exact location can vary by engine model, so consult your vehicle's service manual or an online diagram for precise placement.
What is the difference between an intermittent high voltage and a constant high voltage?
Intermittent high voltage means the issue occurs sporadically, making it harder to diagnose as the sensor might sometimes report correct values. Constant high voltage means the circuit is consistently reporting a reading above specification, which is usually easier to pinpoint.