Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0703
DTC P0703:Â Brake Pedal Position Switch (NC) Malfunction
General DescriptionÂ
The powertrain control module (PCM) detects a brake pedal position switch malfunction by monitoring the signals from the brake pedal position switch. If the PCM continuously inputs an abnormal signal from brake pedal position switch for a specified time during a specified condition, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC TypeÂ
| Execution | Continuous |
| Sequence | None |
| Duration | 5 minutes or more*, Depending on driving conditions** |
| DTC Type | Two drive cycles, MIL off |
* : Symptom 1** : Symptom 2
Enable ConditionsÂ
| Condition | Â |
|---|---|
| Vehicle | ON mode |
| Other* | Accelerator pedal pressed |
Malfunction ThresholdÂ
Either of these conditions occurs:
- Symptom 1
The brake pedal position switch (BKSWNC line) is open for at least 5 minutes when the vehicle speed [VEHICLE SPEED] is at 13 mph (20 km/h) or more.
- Symptom 2
The brake pedal position switch (BKSWNC line) is closed for three cycles when the vehicle is stopped (or decelerated to 1 mph (3 km/h) or less) from vehicle speed [VEHICLE SPEED] over 25 mph (40 km/h).
[ ]: HDS Parameter
Possible CauseÂ
NOTE:Â The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Brake pedal position switch stuck
- Brake pedal position switch BKSWNC line open (includes poor or loose connection)
- Brake pedal position switch BKSWNC line short to power
- Brake pedal position switch BKSWNC line short to ground
- Brake pedal position switch failure
- PCM internal circuit failure
Diagnosis DetailsÂ
Conditions for setting the DTCÂ
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC and the freeze data are stored. The MIL does not come on.
Conditions for clearing the DTCÂ
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.