B278D Scion Code - Malfunction of ID-BOX Recognition
Quick Answer
When the Certification ECU (Smart Key ECU Assembly) detects an input signal indicating that the vehicle is equipped with an ID code box (Immobiliser code ECU) even though the ID code box (Immobiliser code ECU) is not registered, the Certification ECU (Smart Key ECU Assembly) stores this Diagnostic Trouble Code (DTC). Common causes include Misconnection of the ID code box (Immobiliser code ECU). 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
- B278D Scion indicates Malfunction of ID-BOX Recognition.
- Common causes
- Common causes include Misconnection of the ID code box (Immobiliser code ECU).
- 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 B278D Scion Description
What are the Possible Causes of the DTC B278D Scion?
- Misconnection of the ID code box (Immobiliser code ECU)
How to Fix the DTC B278D Scion?
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 B278D Scion 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 B278D Scion Code
1. What does the OBDII code B278D mean on a Scion?
B278D indicates a "Malfunction of ID-BOX Recognition," meaning the vehicle's ID-BOX is not properly recognizing the key or immobilizer system.
2. What are the symptoms of code B278D in a Scion?
Common symptoms include the engine failing to start, the immobilizer light staying on, or error messages related to the key or security system.
3. What causes the B278D code to appear?
This code is typically caused by a malfunction in the ID-BOX, communication issues between the ID-BOX and ECU, a faulty key fob, or wiring/connectivity problems.
4. Can a weak key fob battery trigger code B278D?
Yes, a weak or dead key fob battery can cause communication issues, potentially triggering this code.
5. How do you diagnose the B278D code on a Scion?
Diagnosis involves checking the key fob battery, inspecting wiring and connectors between the ID-BOX and ECU, and scanning for related codes to pinpoint the issue.
6. Can I clear the B278D code without fixing the problem?
Clearing the code without addressing the root cause is not recommended, as the issue will likely persist and the code will return.
7. Is the ID-BOX a replaceable part for resolving code B278D?
Yes, the ID-BOX can be replaced, but it may require reprogramming to match the vehicle's ECU and key data.
8. Can a professional locksmith fix the B278D code?
In some cases, a professional locksmith with advanced tools can reprogram or replace the key and resolve certain immobilizer issues.
9. How much does it cost to fix the B278D code on a Scion?
Repair costs vary depending on the issue but can range from $100 for a new key fob to $500 or more for ID-BOX replacement and reprogramming.
10. Can B278D be caused by a dead car battery?
A dead or weak car battery can result in communication errors, potentially triggering the B278D code. Always check the battery's health first.
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