AutoCodes – Cadillac – P0703 Cadillac

P0703 Cadillac Code - Brake Switch Signal Message Counter Incorrect

Quick Answer

The Body Control Module (BCM) monitors the brake pedal position sensor. Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0703 Cadillac indicates Brake Switch Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,444

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 20, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0703 Cadillac Description

The Body Control Module (BCM) monitors the brake pedal position sensor. When the brake pedal is applied, the BCM detects a predetermined voltage signal. The BCM sends a serial data message to the Engine Control Module (ECM) indicating the status of the stop lamps. The Diagnostic Trouble Code (DTC) will be set when the ECM receives an invalid brake pedal status serial data message from the BCM.

OBDII Code P0703 Cadillac - Brake Switch Signal Message Counter Incorrect - AutoCodes.com — P0703 Cadillac Code - Brake Switch Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P0703 Cadillac?

Faulty Body Control Module (BCM)
Body Control Module harness is open or shorted
Body Control Module circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0703 Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0703 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0703 Cadillac Code

What does the OBDII code P0703 mean for my Cadillac?

The OBDII code P0703 indicates a problem with the brake switch signal, specifically that the message counter is incorrect, which can affect the transmission's operation and the vehicle's safety features.

What are the common symptoms of a P0703 code?

Common symptoms include the brake lights not functioning properly, difficulty shifting gears, or the transmission entering limp mode, which limits the vehicle's speed and performance.

What can cause the P0703 code to trigger?

Causes can include a faulty brake light switch, wiring issues such as shorts or open circuits, improper brake switch alignment, or problems within the transmission control module (TCM).

How can I diagnose the P0703 code?

To diagnose the P0703 code, start by checking the brake light switch for proper operation and alignment. Inspect the wiring and connectors for damage, and use a scan tool to check for additional codes that may provide more context.

What repairs are typically needed for a P0703 code?

Repairs may involve replacing a faulty brake light switch, fixing any damaged wiring or connectors, or reprogramming or replacing the transmission control module if it is determined to be defective.

Is the P0703 code serious?

Yes, the P0703 code can be serious because it can affect braking and shifting performance. It is advisable to address the issue promptly to ensure safe vehicle operation.

Can I drive my Cadillac with a P0703 code?

While it may be possible to drive with a P0703 code, it is not recommended as it can lead to unsafe driving conditions and potential damage to the transmission. It's best to have the issue diagnosed and repaired as soon as possible.

Will clearing the P0703 code fix the problem?

Clearing the P0703 code may temporarily turn off the check engine light, but it will not resolve the underlying issue. If the root cause is not fixed, the code will likely reappear.

How much does it usually cost to fix a P0703 code?

The cost to fix a P0703 code can vary widely depending on the cause of the issue. Simple repairs like replacing a brake light switch might cost $100-$200, while more complex issues could range from $200 to $600 or more depending on the necessary repairs.