U0402 Mercury Code - Invalid Data Received From Transmission Control Module
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 Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission 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
- U0402 Mercury indicates Invalid Data Received From Transmission Control Module.
- Common causes
- Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission 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.
Code U0402 Mercury Description
What are the Possible Causes of the DTC U0402 Mercury?
- Faulty Transmission Control Module (TCM)
- Transmission Control Module harness is open or shorted
- Transmission Control Module circuit poor electrical connection
How to Fix the DTC U0402 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U0402 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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Frequently Asked Questions about U0402 Mercury Code
1. What does the OBDII code U0402 mean for a Mercury?
It means the vehicle's Transmission Control Module (TCM) is sending invalid or corrupted data to other modules, causing communication errors.
2. What are common symptoms of the U0402 code in a Mercury?
Symptoms include transmission shifting issues, poor acceleration, warning lights like the check engine light, and possible limp mode activation.
3. What causes the U0402 code in a Mercury vehicle?
Common causes include software glitches in the TCM, wiring or connector issues, faulty TCM, or problems with related sensors.
4. Can a faulty TCM cause the U0402 code in a Mercury?
Yes, a malfunctioning TCM can send corrupted data, triggering the U0402 code.
5. How can wiring issues lead to the U0402 code?
Damaged or loose wiring can disrupt the communication between the TCM and other modules, causing invalid data transmission.
6. Can the U0402 code affect the transmission performance in a Mercury?
Yes, it can lead to erratic shifting, delayed engagement, or the vehicle entering limp mode to prevent damage.
7. How do I diagnose the U0402 code in a Mercury?
Start by checking the wiring and connectors to the TCM, scanning for additional codes, and inspecting the TCM for faults or software updates.
8. Can clearing the U0402 code fix the issue?
Clearing the code may temporarily resolve it, but the underlying cause needs to be addressed to prevent recurrence.
9. Is the U0402 code serious?
Yes, it can impact driving performance and safety, so prompt diagnosis and repair are recommended.
10. How much does it cost to repair the U0402 code in a Mercury?
Repair costs vary widely depending on the cause, ranging from $100 for wiring fixes to over $1,000 for TCM replacement.
Discuss the causes and fixes for U0402 Mercury OBDII Code
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