![]()
The below Technical Service Bulletins, TSB for short, were issued for the 2018 Mustang and contain symptom, diagnosis, and repair information for common issues. Click the TSB ID numbers below to see the full TSB, there is also a brief description of the TSB below the number.
Issue
Some 2018-2019 Mustang vehicles equipped with a 5.0L engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0420 and/or P0430. This may be due to the operation of the PCM. Follow the Service Procedure steps to replace the affected catalytic converter and reprogram the powertrain control module (PCM).
Issue
Some 2018-2019 F-150 and Mustang vehicles equipped with a 5.0L engine may exhibit a light to moderate knocking type noise at idle (600-700 RPM) that is sometimes described as a quiet diesel type sound. The noise is usually more prominent on the passenger side of the vehicle toward the rear of the engine. As the engine comes up to operating temperature, the noise level increases slightly. This noise is not detrimental to engine function and has no short or long term effects on engine durability. This an operating characteristic of the 5.0L engine and no repairs should be attempted.
Issue
Some 2018-2019 F-150 and Mustang vehicles equipped with a 5.0L engine built on or before 30-Apr-2019 may exhibit a chirping type noise from the upper engine front cover area at warm or hot idle. This noise may sound similar to a front engine accessory drive (FEAD) chirp noise. This may be due to the primary timing chain tensioner oil pressure relief valve. To correct the condition, follow the Service Procedure steps to replace the primary timing chain tensioners.
Issue
Some 2018 Mustang vehicles equipped with a 5.0L engine and a manual transmission may exhibit an inability to engage third and fourth gear. This may be due to a broken 3-4 shift fork.
Issue
Some 2018 F-150 and 2018-2019 Mustang vehicles equipped with a 5.0L engine may exhibit an illuminated MIL with DTCs P0390 and/or P0394 stored in the powertrain control module (PCM).
Issue
Some 2013-2018 C-Max, 2013-2019 Escape/Fusion/MKZ, 2015-2018 Focus, 2015-2019 Edge/F150/MKC/Mustang, 2016-2018 MKX, 2016-2019 Explorer, 2017 Super Duty, 2018-2019 EcoSport/Expedition, and 2019 Nautilus vehicles may experience seat pan looseness, lateral movement, or clunk/thump noise on turns.
Issue
Some 2018 Mustang vehicles equipped with a 5.0L engine built on or before 16-Apr-2018 may exhibit an Exhaust Mode Selection Not Available or Drive Mode Not Available message displayed in the instrument panel cluster (IPC). This may occur when attempting to change the exhaust mode or drive mode.
Issue
Some 2018-2019 Mustang vehicles equipped with a 5.0L engine and a manual transmission may exhibit an inability to drive the vehicle in first and/or second gear. This may be due to a broken 1-2 shift fork.
Issue
Some 2018 Mustang vehicles may exhibit scratches on the luggage compartment lid moulding, which is the black panel located between the tail lights. Scratches can be polished out of this moulding in order to avoid replacement of the moulding.
Issue
Some 2017-2018 F-150/Raptor, 2018 Expedition/Mustang/Navigator vehicles equipped with a 10R80 automatic transmission and built on or before 20-Nov-2017 may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P0741 and P1744 in the powertrain control module (PCM) or transmission control module (TCM). This may be due to a sticking torque converter clutch (TCC) valve in the main control valve body assembly.
Issue
Some 2018 Mustang vehicles equipped with a 5.0L engine may exhibit an illuminated MIL with DTC P0316 and/or P0111.
Issue
Some 2018 Expedition/F-150/Mustang/Navigator vehicles equipped with a 10R80 automatic transmission and built on or before 30-Nov-2017 may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0721 in the powertrain control module (PCM) or transmission control module (TCM).
Issue
In some of the affected vehicles, the park pawl guide roll pin may not have been installed. If the roll pin is missing, the guide cup could move out of position with repeated use. The transmission may eventually lose Park function, even when the shifter and PRNDL display indicate the vehicle is in park. This condition could allow the ignition key, if equipped, to be removed with no instrument panel warning message or warning chime while exiting the vehicle indicating the vehicle is not secured in park. This could result in unintended vehicle movement, increasing the risk of injury or crash.
Issue
Some 2015-2018 Mustang GT350 vehicles built on or before 26-Feb-2018 may exhibit an excessive panel gap where the rear bumper cover meets the rear quarter panels on either side of the vehicle. This may be due to the method used to fasten the rear bumper cover to the vehicle.
Issue
Some 2018 Mustang vehicles equipped with a 5.0L engine and a manual transmission built on or before 15-Nov-2017 may exhibit an inability or difficulty to shift the vehicle into second gear. This may be due to a stack-up tolerance issue between the transmission and the shifter.
Issue
Some 2015-2018 Mustang vehicles with a convertible top may exhibit a condition where the top sags on one or both sides near the rear glass due to broken tension rod clips.
Issue
Some of the affected vehicles may not conform to the requirements specified by Federal Motor Vehicle Safety Standards (FMVSS) No. 102 Tranmission Shift Lever Sequence, Starter Interlock, and Tranmission Braking Effect; and No. 114 Theft Protection and Rollaway Prevention. If the customer keys-off the vehicle with the transmission in a position other than park, the instrument cluster may not illuminate the PRNDL display or activate the key-in-ignition-warning chime while the driver's door is ajar, which could increase the likelihood of vehicle rollaway.
