AutoCodes – Mercury – U1243 Mercury

U1243 Mercury 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 Mercury 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 405

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
FAQs
Comments
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Code U1243 Mercury 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 Mercury - Invalid Or Missing Data For Exterior Environment - AutoCodes.com — U1243 Mercury Code - Invalid Or Missing Data For Exterior Environment

What does this mean?

What are the Possible Causes of the DTC U1243 Mercury?

Faulty Network
Faulty Powertrain Control Module (PCM)

How to Fix the DTC U1243 Mercury?

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 Mercury 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 U1243 Mercury Code

1. What are the common symptoms of OBDII code U1243 in a Mercury vehicle?

- Common symptoms include malfunctioning exterior temperature display, inaccurate ambient light sensor readings, and issues with automatic headlight controls.

2. What can cause the OBDII code U1243 "Invalid Or Missing Data For Exterior Environment" in a Mercury?

- The code U1243 in a Mercury is usually triggered by faults in the exterior temperature sensor, ambient light sensor, or wiring/connectivity issues in the exterior environment sensor system.

3. How can I diagnose the OBDII code U1243 in my Mercury?

- To diagnose the U1243 code, you can use a diagnostic scanner to retrieve the code, inspect the exterior environment sensor system for any visible damage, and perform a thorough check of the sensor's wiring and connections.

4. Can a faulty ambient light sensor trigger the U1243 code in a Mercury?

- Yes, a malfunctioning ambient light sensor can contribute to triggering the U1243 code in a Mercury by providing inaccurate data to the vehicle's control module.

5. What are some repair tips for addressing the U1243 code in a Mercury?

- Repair tips include checking and replacing the exterior temperature sensor, inspecting and potentially replacing the ambient light sensor, ensuring proper wiring connections, and clearing the code with a diagnostic scanner after repairs are made.

6. Is it safe to continue driving with the U1243 code present in a Mercury?

- While the vehicle may still be operable with the U1243 code triggered, it is recommended to address the issue promptly to prevent further damage or inaccurate readings from the exterior environment sensors.

7. Can a DIY enthusiast fix the U1243 code issue in a Mercury?

- Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to address the U1243 code by following repair guides, consulting service manuals, and using diagnostic equipment.

8. Are there any recalls or technical service bulletins related to the U1243 code in Mercury vehicles?

- It is advisable to check with the manufacturer or authorized dealerships for any recalls or technical service bulletins related to the U1243 code in Mercury vehicles, as they may provide valuable information or assistance in resolving the issue.

9. How much does it typically cost to repair the U1243 code in a Mercury at a dealership or mechanic?

- The cost of repairing the U1243 code in a Mercury can vary depending on the specific cause of the issue, but it may involve sensor replacements, wiring repairs, and diagnostic labor, which can range from a few hundred to over a thousand dollars.

10. Can extreme weather conditions affect the triggering of the U1243 code in a Mercury?

- Yes, extreme weather conditions such as intense sunlight or severe cold can potentially impact the performance of the exterior environment sensors and contribute to triggering the U1243 code in a Mercury.