How to reset system of a F150 - after ignition left on on all night.

Asked by Sep 16, 2015 at 03:46 PM about the 2008 Ford F-150 STX

Question type: Maintenance & Repair

Ignition left on all night - truck would not start.  Recharged battery - truck starts but all dash gauges not working.  Truck has full tank of gas but dash readout says "0 miles to empty"  FYI - truck only has 20,000miles.

3 Answers

113,835

You can try disconnecting a battery cable, turn on the headlight switch for at least 30 seconds, then turn off the headlights and reconnect the battery cable, this may cause the anti-theft to activate so be sure you know how to turn it off before disconnecting the cable. This will reset the ECM back to factory presets, so it may drive a little strange for the first 20 or so miles until it relearns the vehicle and hoe you drive. If this fails to make everything work as it did before then you will have to go to a dealer and have the system reflashed, there may also be a software update that the dealer will do at the same time. HTH

Best Answer Mark helpful

Thank you tennisshoes - your instructions / solution worked - all gauges are working ! Have not driven the truck yet - it starts and runs OK. alpo5050

113,835

That's good news, remember it might not run as it did until it relearns, so when you start out make sure you have enough time to complete the relearn cycle, try to do some varied driving. Glad it worked.

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