B10ABMinorBody / Remote Keyless Entry

B10AB: Remote Keyless Entry Synchronization

2 vehicles · 1 makes · $120-$700 repair

Most Reported On

2009-2019Ford Flex 2007-2020Ford EdgeSE +5

B10AB is an OBD-II diagnostic trouble code meaning “Remote Keyless Entry Synchronization.” The Body Control Module (BCM) / Remote Function Actuator compared the rolling security counter received in a Remote Keyless Entry (RKE) transmitter message against the counter it has stored for that fob and found them out of synchronization, so the transmission was rejected as invalid. It is a security/synchronization fault, not an HVAC or powertrain fault — note that the catalogue issue citing this code (Ford Edge blend door actuator) does not match this code's actual meaning. This code is most commonly reported on 2009-2019 Ford Flex, and 2007-2020 Ford Edge (SE, SEL, Limited, Titanium, Sport, ST), with repair costs ranging from $120 to $700.

Common Causes

1Key fob buttons pressed repeatedly out of range, driving the rolling counter past the module's resync window

2Key fob / Integrated Keyhead Transmitter (IKT) needs to be re-programmed to the vehicle

3Failing or weak key fob battery causing corrupt transmissions

4Faulty Integrated Keyhead Transmitter

5Failed BCM / RFA module or aftermarket remote-start interference

Typical Repair Cost

$120 - $700

Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.

Diagnostic Tools

B10AB does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.

Vehicles Affected (2)

Ford B10AB page →

FlexMinor

HVAC Blend Door Actuator Gear Stripping Causes Clicking and Split Cabin Temperatures

2009-2019$120-$700

EdgeModerate

HVAC Temperature Blend Door Actuator Failure - Heat or A/C on One Side Only

2007-2020$180-$650

FAQ

What does B10AB mean?

B10AB stands for "Remote Keyless Entry Synchronization." The Body Control Module (BCM) / Remote Function Actuator compared the rolling security counter received in a Remote Keyless Entry (RKE) transmitter message against the counter it has stored for that fob and found them out of synchronization, so the transmission was rejected as invalid. It is a security/synchronization fault, not an HVAC or powertrain fault — note that the catalogue issue citing this code (Ford Edge blend door actuator) does not match this code's actual meaning.

What are the most common causes of B10AB?

The most common causes of B10AB are: Key fob buttons pressed repeatedly out of range, driving the rolling counter past the module's resync window, Key fob / Integrated Keyhead Transmitter (IKT) needs to be re-programmed to the vehicle, Failing or weak key fob battery causing corrupt transmissions, Faulty Integrated Keyhead Transmitter, Failed BCM / RFA module or aftermarket remote-start interference. The specific cause varies by vehicle.

How much does it cost to fix B10AB?

Repair costs for B10AB range from $120 to $700, depending on the vehicle and root cause.

Which vehicles are affected by B10AB?

Au7o has documented B10AB across 2 vehicle models from 1 manufacturers: Ford.

Sources (6)

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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.