Speed Control Unable to Hold Speed
2016-2018 Lincoln MKX 3.7L V6
Description
The cruise control system cannot maintain the set speed. The PCM detects excessive variation between set speed and actual vehicle speed during cruise control operation.
Symptoms
- Cruise control disengages
- Speed surges while cruise is active
- Check Engine Light
Common Causes
- Faulty cruise control servo/actuator
- Vacuum leak to cruise control actuator (older models)
- Throttle cable or linkage issue
- Vehicle speed sensor issue
- ETC system fault (drive-by-wire models)
Diagnostic Steps
- Test cruise control actuator operation
- Check vacuum supply to servo (if vacuum operated)
- Verify vehicle speed sensor accuracy
- Check for other DTCs related to throttle or speed
Repair Notes
Replace cruise control actuator if faulty. Repair vacuum leaks. Address related DTCs.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
P1568 on Other Vehicles
Lincoln Aviator
2003-2005 4.6L V8
Lincoln Aviator
2003-2005 4.6L V8 DOHC
Lincoln Aviator
2020-2024 3.0L Twin-Turbo V6
Lincoln Aviator
2020-2024 3.0L V6 Twin Turbo
Lincoln Aviator Grand Touring
2020-2024 3.0L Twin Turbo V6 PHEV
Lincoln Aviator Grand Touring
2020-2024 3.0L Twin-Turbo V6 Hybrid
Lincoln Aviator Grand Touring
2020-2024 3.0L V6 Twin Turbo Hybrid
Lincoln Blackwood
2002-2002 5.4L V8
Common Questions
What does code P1568 mean on a 2016-2018 Lincoln MKX?
P1568 stands for "Speed Control Unable to Hold Speed". The cruise control system cannot maintain the set speed. The PCM detects excessive variation between set speed and actual vehicle speed during cruise control operation.
What are the symptoms of P1568 on a Lincoln MKX?
Common symptoms of P1568 include: Cruise control disengages, Speed surges while cruise is active, Check Engine Light.
What causes P1568 on a 2016-2018 Lincoln MKX?
Common causes of P1568 include: Faulty cruise control servo/actuator, Vacuum leak to cruise control actuator (older models), Throttle cable or linkage issue, Vehicle speed sensor issue, ETC system fault (drive-by-wire models).