Damaged wiring, such as chafed, open-circuit or shorted wires in the lamp control circuit; Corroded, loose or pushed-out pins at the module, cluster or in-line connectors; Faulty lamp, LED or indicator element in the instrument cluster; Fault in the instrument cluster circuitry or its lamp driver; Internal fault in the control module's output driver; Water ingress or previous repair damage affecting the cluster or harness.

P06FF

Economy Mode Lamp Control Circuit.

Generic
Powertrain
Generic code
Low severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
6: AreaComputer and output circuits
FF: FaultThe specific fault in that area

What it means

P06FF means the control module has found a fault in the control circuit for the economy mode (eco) indicator lamp. The module commands the lamp on or off and monitors the output driver or circuit. If the voltage or current does not match what was commanded, for example an open circuit or a short to ground or supply, it sets the code. Which module controls the lamp, and how the circuit is wired, depends on the model.

Symptoms

Economy mode lamp stays on, stays off or flickers
Economy mode lamp does not light during the bulb check at ignition on
Malfunction indicator lamp or a general warning lamp may be lit, depending on the vehicle
Economy mode switch or function appears not to respond
Instrument cluster behaving oddly or showing other lamp faults

Possible causes

Damaged wiring, such as chafed, open-circuit or shorted wires in the lamp control circuitlikely
Corroded, loose or pushed-out pins at the module, cluster or in-line connectorslikely
Faulty lamp, LED or indicator element in the instrument clusterpossible
Fault in the instrument cluster circuitry or its lamp driverpossible
Internal fault in the control module's output driverrare
Water ingress or previous repair damage affecting the cluster or harnessrare

How to diagnose

Read all stored and pending codes and note any other lamp, cluster or communication faults, as they may point to a shared cause
Review the freeze frame data and check whether the code is current or intermittent after clearing and retesting
Observe the economy lamp during the ignition-on bulb check and while operating the economy mode switch, if fitted
Visually inspect the harness and connectors between the control module and the instrument cluster for chafing, corrosion, moisture and bent or loose pins
Check the vehicle's wiring diagram for the lamp circuit, as the supply and driver arrangement varies by model
With the ignition on, test the circuit for supply voltage, ground and continuity, and for shorts to ground or voltage
Command the lamp on and off with a scan tool's output test, if the vehicle supports it, and compare the lamp's response with the circuit readings
Check the cluster and module power and earth supplies before suspecting a module fault

How to fix

Repair or replace damaged wiring and restore the circuit to its correct condition
Clean, repair or replace corroded or damaged connectors and terminals
Replace the faulty lamp, LED or instrument cluster as the manufacturer's procedure directs
Repair or replace the control module only after the wiring, connectors and power supplies have been proven good
Clear the code and road test to confirm it does not return

Can I keep driving?

Low severity

The car can normally be driven as the fault only affects an indicator circuit. Book it in for diagnosis, especially if other warning lamps are showing or the engine management is behaving unusually.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.