TSB fix for Ford Low idle or fluctuating idle Ford

Fix low idle or fluctuating idle on Ford Vehicles

Ford has issued a service bulletin #10-21-6 to address a problem a Ford low idle or fluctuating idle on the vehicles listed below. If your vehicle matches the model year and build dates listed below, Ford recommends installing a new throttle body to correct the problem.

Models with low idle or fluctuating idle problems

2010-11 Ford Focus, Fusion, Taurus

2010 E-150, E-250, Edge, F-150 trucks

2010-11 Ford Flex

2010 -11 Lincoln MKS, MKZ

2010-2011 Lincoln MKT

Engines involved that have low idle or fluctuating idle

The service bulletin only applies to these engines: 2.0L, 3.5L (w/o GTDI), 3.7L, and 4.6L 2-valve.

Low idle and fluctuating idle symptoms and trouble codes

Ford reports that the symptoms show as an idle speed that drops below the recommended speed or the vehicle exhibits a fluctuating idle. The vehicle may or may not store the following trouble codes:

P2111 Throttle Actuator Control (TAC) System Stuck Open

P2112  Throttle Actuator Control (TAC) System Stuck Closed

Affects only those vehicle with these build dates

2.0L 2/11/2010 thru 8/2/2010

3.5L and 3.7L 3/1/2010 thru 8/3/2010

4.6 2-valve 5/7/2010 thru 8/2/2010

Replace throttle body with updated design to fix low idle or fluctuating idle

Ford has issued updated parts to fix the problem.

7T4Z-9E926-FA

7T4Z-9E926-FA Electronic Throttle

8S4Z-9E926-B

Electronic Throttle

©, 2017 Rick Muscoplat