AutoCodes – Generic – U0503

U0503 Code - Invalid Data Received From Door Control Module 'D'

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Door Control Module 'D', Door Control Module 'D' harness is open or shorted, Door Control Module 'D' 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: U0503 indicates Invalid Data Received From Door Control Module 'D'.
Common causes: Common causes include Faulty Door Control Module 'D', Door Control Module 'D' harness is open or shorted, Door Control Module 'D' 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 1,946

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 Apr 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code U0503 Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. Some devices are constantly receiving information from other devices through serial data communication network. The invalid data Diagnostic Trouble Code (DTC) will be set when a receiving device detects a discrepancy in the information it receives from the Door Control Module 'D' causing its integrity to be questioned.

OBDII Code U0503 - Invalid Data Received From Door Control Module 'D' - AutoCodes.com — U0503 Code - Invalid Data Received From Door Control Module 'D'

What does this mean?

What are the Possible Causes of the DTC U0503?

Faulty Door Control Module 'D'
Door Control Module 'D' harness is open or shorted
Door Control Module 'D' circuit poor electrical connection

How to Fix the DTC U0503?

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 U0503 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.