What does P1106 mean on a Ford?

P1106. Dual Alternator Lower Malfunction. Applies to Super Duty and E-Series with dual alternator packages.

What causes P1106 on a Ford?

Failed lower alternator Open field circuit to the lower unit Oil or road splash contaminating the lower unit Corroded lower charge cables PCM driver fault

How do I fix P1106 on a Ford?

Test each alternator output separately Inspect the lower unit for contamination and corrosion Check field control and charge wiring Clean all cable connections Replace the lower alternator if its circuit tests good

Code

P1106

Dual Alternator Lower Malfunction

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: Super Duty and E-Series with dual alternator packages
Related: P0562 Charging System Voltage Low on OBD Codes List

Findings, check these first

Failed lower alternator
Open field circuit to the lower unit
Oil or road splash contaminating the lower unit
Corroded lower charge cables
PCM driver fault

Standard procedure

Test each alternator output separately
Inspect the lower unit for contamination and corrosion
Check field control and charge wiring
Clean all cable connections
Replace the lower alternator if its circuit tests good

Code lookup

Type a code above, or start from a symptom or a common code.

Press / to jump to the box. Ford-enhanced powertrain, body, chassis and network codes. Generic P0xxx codes live on OBD Codes List.

Sources and review

Review: qualified. Read the source limits below.

OBDII.pro: P1106 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1106: Dual Alternator Lower Fault/ Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage
Fetched directly. obdii.pro is a publisher independent of the engine-codes family.

Last updated 2026-09-05.

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