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What are the common causes of the P0703 trouble code?

2 Answers

SanAbel

07/28/25 7:19pm

Possible causes for the P0703 trouble code include BPA/BPP switch failure, calibration error, circuit or connector issues, or electronic module failure connected to BPA/BPP. Here are specific details about the P0703 trouble code: 1. The P0703 trouble code indicates a brake switch B circuit malfunction. The brake switch transmits information about whether the brake pedal is depressed to the electronic control unit (ECU) as an electrical signal, serving as crucial data for disengaging cruise control and separating the torque converter. 2. After troubleshooting vehicle issues, it's necessary to clear the trouble codes. When clearing trouble codes, strictly follow the specific clearing method prescribed for the vehicle model. Never attempt to clear codes by randomly disconnecting the battery's negative terminal.

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AbigailFitz

08/12/25 12:28am

P0703 trouble code generally indicates a problem with the vehicle's braking system, particularly the brake light switch or its wiring circuit. I've inspected many such cases, and common causes include aging of the brake switch, where prolonged use leads to wear and poor contact; short circuits or broken wires are also frequent, such as loose wiring connectors or rodent damage; blown fuses due to excessive current; and in some cases, signal confusion in the control module. The brake light switch is located beneath the brake pedal—it should illuminate the rear lights when you press the brake. If it fails, the lights won't turn on, and it may also affect gear shifting or deactivate cruise control. You can perform a simple check yourself: start the car, press the brake, and observe if the rear lights illuminate; if not, inspect the brake-related fuses in the fuse box. It's advisable to address this issue promptly, as driving with it unresolved can be hazardous.

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