Fault code P1106 – a step-by-step guide to diagnosing and fixing it

Error code P1106 is displayed and the check engine light is on - what does this mean?

The DTC P1106 is a manufacturer-specific fault code that is recognized by the OBD/EOBD system and indicates a problem with the Manifold Absolute Pressure (MAP) sensor or the Barometric Pressure (BARO) sensor. This trouble code mainly occurs in General Motors vehicles and indicates a malfunction in the intake pressure system. The exact definition can vary depending on the manufacturer, but usually refers to sensors for measuring pressure in the intake system.

What can cause this error code?

• Defective MAP sensor (Manifold Absolute Pressure)
• Damaged BARO sensor (Barometric Pressure)
• Broken or corroded cable connections to the sensor
• Defective plug connections on the sensor plug
• Short circuit in the sensor cabling
• Blocked or leaking vacuum hoses
• Faulty engine control unit software
• Mechanical damage to the sensor due to heat or vibration

What symptoms occur in parallel with error code P1106?

• Engine performance: Reduced engine power and poor acceleration
• Idle problems: Unsteady or fluctuating idling
• Fuel consumption: Increased fuel consumption due to incorrect mixture formation
• Starting behavior: Difficulty starting the engine when cold
• Check engine light: Permanently illuminated check engine light
• Exhaust values: Deteriorated emission values during the emissions test

How can the problem with fault code P1106 be rectified?

• Repairing fault code P1106 requires a systematic diagnosis of the affected components.
• Replace the MAP sensor: Replace defective Manifold Absolute Pressure sensor with a new original part and calibrate correctly
• Replace BARO sensor: Remove Barometric Pressure Sensor and replace with functional sensor
• Repair wiring harness: Locate damaged wiring, replace defective sections and insulate properly
• Clean plug connections: Remove sensor plug, clean contacts with contact spray and reconnect firmly
• Check vacuum hoses: Check all vacuum lines for cracks or blockages and replace if necessary
• Engine control unit update: Update the ECU software to the latest version or have the control unit reprogrammed