P1106
HondaThe Powertrain Control Module (PCM) detects an intermittent high voltage signal from the Manifold Absolute Pressure (MAP) sensor circuit.
Medium SeverityThis code indicates that the Manifold Absolute Pressure (MAP) sensor is sending an intermittently high voltage signal to the engine computer, which can lead to incorrect fuel delivery and engine performance issues. Drivers may experience rough idling, poor acceleration, or reduced fuel efficiency due to the engine receiving inaccurate information about intake manifold pressure.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is turned off and the engine is cool before working on any engine components. Disconnect the battery's negative terminal to prevent accidental electrical shorts or injury during sensor replacement.
Common Symptoms
- Rough idle
- Poor acceleration
- Reduced fuel economy
- Check Engine Light illuminated
- Engine may run rich or lean
- Hesitation during acceleration
Common Causes
- Faulty Manifold Absolute Pressure (MAP) sensor
- Corrosion or damage to the MAP sensor electrical connector
- Wiring harness issues (chafed, broken, or shorted wires)
- Vacuum leaks affecting manifold pressure readings
- Faulty Powertrain Control Module (PCM) (less common)
Frequently reported on: Honda Civic (2001-2005), Honda CR-V (2002-2006), Honda Accord (1998-2002), Honda S2000 (2000-2009), Honda Element (2003-2011)
Diagnostic Steps
- Safely park the vehicle on a level surface and engage the parking brake.
- Turn off the engine and allow it to cool.
- Locate the Manifold Absolute Pressure (MAP) sensor, typically mounted on the intake manifold or connected to it via a vacuum hose.
- Carefully disconnect the electrical connector from the MAP sensor by pressing the release tab.
- If the sensor is bolted, unbolt it; if it's secured by a clip or simply pushed into a grommet, gently remove it.
- Inspect the sensor and its electrical connector for any visible damage, corrosion, or signs of wear.
- Replace the old MAP sensor with a new, compatible part.
- Reconnect the electrical connector, ensuring it clicks securely into place.
- Clear the P1106 code using an OBD-II scanner.
- Start the engine and check if the Check Engine Light returns.
👨🔧 When to Call a Professional
If after inspecting and replacing the MAP sensor, the code persists or if other complex drivability issues are present, it's best to consult a qualified mechanic to diagnose potential underlying electrical or PCM problems.
Commonly Asked Questions
What is a MAP sensor and what does it do?
The Manifold Absolute Pressure (MAP) sensor measures the pressure inside the engine's intake manifold and sends this data to the engine's computer. This information is crucial for calculating engine load and adjusting fuel delivery and ignition timing.
Can I drive with a P1106 code?
While it may be possible to drive short distances, it is not recommended for extended periods. The P1106 code indicates an intermittent high voltage signal from the MAP sensor, which can lead to poor engine performance, reduced fuel economy, and potentially more serious engine damage over time if not addressed.
Is replacing the MAP sensor difficult?
Replacing a MAP sensor is generally an easy DIY task for most vehicles, including Hondas. It usually involves disconnecting an electrical connector and removing a few bolts or a clip. Always ensure the engine is cool and the battery is disconnected before starting.
Why is my MAP sensor showing intermittent high voltage?
Intermittent high voltage can be caused by the sensor itself failing, corrosion or poor connection at the electrical connector, or a fault within the wiring harness leading to the sensor. Less commonly, it could indicate an issue with the engine's computer (PCM).
Will cleaning the MAP sensor fix the P1106 code?
In some cases, cleaning a dirty MAP sensor with a specialized sensor cleaner might resolve the issue, especially if it's caked with carbon or oil. However, if the sensor itself is internally faulty or if there's an electrical issue, cleaning alone may not be sufficient, and replacement or further diagnosis would be needed.