Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
4-110 Powertrain DTC Charts and Descriptions
Diagnostic Trouble Code (DTC) Charts and Descriptions
P1500 - Vehicle Speed Sensor (VSS) (Continued)
All others The PCM uses information from the ABS control module and the TCM to calculate vehicle speed. Check
these modules for DTCs.
P1501 - Vehicle Speed Sensor (VSS) Out Of Self-Test Range
Description: This DTC sets when the VSS input signal is out of self-test range. If the PCM detects a VSS input signal any
time during the self-test, this DTC sets and the test aborts.
Possible Causes: • Electrical noise on the VSS input signal from radio frequency interference or electro magnetic interference
• External sources, such as ignition wires, the charging circuit or aftermarket equipment
Diagnostic Aids: Verify the VSS input is 0 km/h (0 mph) when the vehicle transmission is in PARK.
Application Key On Engine Off Key On Engine Running Continuous Memory
F-650 / F-750, Refer to the Description, Possible Causes and Diagnostic Aids for the DTC. F-Series Super Duty, Fiesta, Fusion, KA, Motorhome / Stripped Chassis / Step Van
Manual Transmission Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.
All others The PCM uses information from the ABS control module and the TCM to calculate vehicle speed. Check
these modules for DTCs.
P1502 - Vehicle Speed Sensor (VSS) Intermittent
Description: This DTC sets when there is a concern with the vehicle speed data. Vehicle speed data is received from either
the VSS or anti-lock brake system (ABS) control module. This DTC sets the same way as P0500. However, it is intended to flash the transmission control indicator lamp (TCIL) for first time VSS circuit error.
Possible Causes: • Noisy VSS input signal from the radio frequency interference/electromagnetic interference (RFI/EMI)
external sources, such as ignition wires, the charging circuit or after market equipment
Diagnostic Aids: Verify the VSS input is 0 km/h (0 mph) when the vehicle transmission is in PARK.
Application Key On Engine Off Key On Engine Running Continuous Memory
F-650 / F-750, GO to Pinpoint Test DF. F-Series Super Duty, Fiesta, Fusion, KA, Motorhome / Stripped Chassis / Step Van
Manual Transmission GO to Pinpoint Test DP.
All others The PCM uses information from the ABS module and the TCM to calculate vehicle speed. Check these
modules for DTCs.
P1548 - Engine Air Filter Restriction
Description: This DTC sets when the airflow is out of range at various engine speeds and during wide open throttle (WOT)
operation when compared to the calibrated value.
Possible Causes: • Intake air restriction
• Clogged air filter
Diagnostic Aids: If this DTC sets, inspect the intake air system and replace the air filter if no restrictions are found. Refer to the
Workshop Manual Section 303-12, Intake Air Distribution and Filtering for air filter replacement.
Application Key On Engine Off Key On Engine Running Continuous Memory
All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.
2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.