P1106

Severity: Low

Dual Alternator Lower Fault/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage

Last updated: July 2026

System

Powertrain

Subsystem

Fuel & Air Metering

Code Type

Manufacturer-specific

What does P1106 mean?

P1106 is a manufacturer-specific powertrain diagnostic trouble code. It is defined as "Dual Alternator Lower Fault/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage". It falls under the fuel & air metering area of the vehicle’s powertrain system, and its exact meaning can vary between manufacturers.

When is P1106 set?

The onboard diagnostic system sets P1106 when it detects a condition matching "dual alternator lower fault/ manifold absolute pressure (map) sensor circuit intermittent high voltage" in the fuel & air metering circuit or system. When the fault is confirmed, the module stores the code and, in most cases, turns on a warning light.

This code is generally minor and often relates to a signal, range or performance condition. It should still be inspected, especially if it returns after clearing.

Common symptoms

Check engine light (MIL) illuminated
Rough running, hesitation or loss of power
Increased fuel consumption
Difficulty starting or stalling

Possible causes

A failing or contaminated sensor in the affected circuit
Wiring, connector or ground problems
Vacuum, intake or exhaust leaks
A worn or failing mechanical component
Occasionally, a fault in the control module itself

What to check first

Scan for all stored and pending codes and note the freeze-frame data
Inspect the wiring and connectors for the affected circuit
Check for related leaks, loose components or obvious damage
Test the relevant sensor and its reference/ground with a meter
Clear the code and retest to see whether it returns

Frequently asked questions

What does the P1106 code mean?

P1106 means "Dual Alternator Lower Fault/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage". It is a manufacturer-specific powertrain trouble code in the fuel & air metering area.

Is it safe to drive with a P1106 code?

This code is usually minor, and short-distance driving is often possible, but you should still have it checked — especially if the warning light stays on or the code returns.

How do I fix a P1106 code?

There is no single fix. Start by confirming the code with a scan tool, then work through the likely causes and checks above — inspecting wiring, connectors and the relevant components before replacing any parts. On your specific make, confirm the diagnosis before repairs.

Can I clear the P1106 code myself?

You can clear the code with an OBD-II scan tool, but if the underlying fault is still present it will usually return. Clearing without repair is only useful to confirm whether the fault is active.

Related codes

P1107

Dual Alternator Lower Circuit Malfunction/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage

P1108

Dual Alternator Battery Lamp Circuit Malfunction

P1105

Dual Alternator Upper Fault

P1109

IAT – B Sensor Intermittent

Important

This information is provided for general reference only. It is not repair advice and may not apply to every make or model. Manufacturer-specific codes can differ. Always confirm a diagnosis with a scan tool and, where needed, a qualified technician before replacing parts.