AutoCodes – Generic – U1243

U1243 Code - Invalid Or Missing Data For Exterior Environment

Quick Answer

The Anti-lock Brake System (ABS) Module is on the Serial Communications Protocol (SCP) Communication network. Common causes include Faulty Network, Faulty Powertrain Control Module (PCM). 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: U1243 indicates Invalid Or Missing Data For Exterior Environment.
Common causes: Common causes include Faulty Network, Faulty Powertrain Control Module (PCM).
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 8,518

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 May 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code U1243 Description

The Anti-lock Brake System (ABS) Module is on the Serial Communications Protocol (SCP) Communication network. The ABS module controls the brake pressure to the 4 wheels to keep the vehicle under Control while braking. The ABS module also controls the stability assist and traction Control systems (if equipped). If one of the BUS wires becomes shorted to ground or battery voltage, or if some but not all termination resistors are lost, communications can continue at a degraded level.

OBDII Code U1243 - Invalid Or Missing Data For Exterior Environment - AutoCodes.com — U1243 Code - Invalid Or Missing Data For Exterior Environment

What does this mean?

What are the Possible Causes of the DTC U1243?

Faulty Network
Faulty Powertrain Control Module (PCM)

How to Fix the DTC U1243?

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 U1243 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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Information for Specific Makes

U1243 Ford — Invalid Or Missing Data For Exterior Environment
U1243 Infiniti — Front Display Connection
U1243 Lincoln — Invalid Or Missing Data For Exterior Environment
U1243 Mercury — Invalid Or Missing Data For Exterior Environment
U1243 Nissan — Front Display Connection

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.