P0501 - Vehicle Speed Sensor A Range/Performance

4-74 Powertrain DTC Charts and Descriptions

Diagnostic Trouble Code (DTC) Charts and Descriptions

P0501 - Vehicle Speed Sensor A Range/Performance

Description:

Possible Causes:

Diagnostic Aids: Refer to the Workshop Manual Section 303-14, Electronic Engine Controls.

Application Key On Engine Off Key On Engine Running Continuous Memory

All Refer to the Description, Possible Causes and Diagnostic Aids for the DTC.

P0503 - Vehicle Speed Sensor (VSS) A Intermittent/Erratic/High

Description: This DTC sets when an incorrect or noisy VSS signal is detected. Vehicle speed data is received from either the

VSS or the anti-lock brake system (ABS) module.

Possible Causes: • Noisy VSS input signal from radio frequency interference or electromagnetic interference external sources,

such as ignition components or the charging circuit

• Damaged VSS or driven gears

• Damaged VSS wiring harness or connectors

• Concern in the modules or circuits connected to the VSS circuit

• Aftermarket add-on

Diagnostic Aids: Monitor the VSS PID while driving the vehicle, and check for intermittent vehicle speed indication. Verify the

ignition and charging systems are functioning correctly.

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 transmission control module (TCM) to

calculate vehicle speed. Check these modules for DTCs.

P0504 - Brake Switch Correlation

Description: This DTC sets when the calibrated threshold is exceeded during a comparison test between the brake pedal

switch (BPS) and the brake pedal position (BPP) switch.

Possible Causes: • Damaged brake switch

• BPS circuit open

• BPS circuit short to voltage

• BPS circuit short to ground

• BPP circuit open

• BPP circuit short to voltage

• BPP circuit short to ground

Diagnostic Aids: Check the state of the BOO1 and BOO2 PIDs. The BOO1 PID is normally open and BOO2 PID is normally

closed.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test FD.

P0505 - Idle Air Control (IAC) System

Description: This DTC sets when the desired RPM could not be reached or controlled during the key ON, engine running

(KOER), self-test.

Possible Causes: • Failure mode effects management (FMEM) condition is present

• Intake air restriction

• Exhaust restriction

• Sludged throttle body

• Vacuum leaks

• Damaged electronic throttle body (ETB)

2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015