B2278 Scion Code - Engine Switch Circuit Malfunction
Quick Answer
This Diagnostic Trouble Code (DTC) is output when a malfunction is detected between the Main Body ECU and the engine switch, or either of the switches inside the engine switch is malfunctioning. Common causes include Faulty Engine Switch, Engine Switch harness is open or shorted, Engine Switch 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
- B2278 Scion indicates Engine Switch Circuit Malfunction.
- Common causes
- Common causes include Faulty Engine Switch, Engine Switch harness is open or shorted, Engine Switch 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 B2278 Scion Description
What are the Possible Causes of the DTC B2278 Scion?
- Faulty Engine Switch
- Engine Switch harness is open or shorted
- Engine Switch circuit poor electrical connection
- Faulty Main Body ECU
How to Fix the DTC B2278 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 B2278 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 B2278 Scion Code
1. What does the OBDII code B2278 mean on a Scion?
The B2278 code indicates an Engine Switch Circuit Malfunction, meaning there’s an issue with the push-button start or ignition switch system.
2. What are the common symptoms of a B2278 code in a Scion?
Symptoms may include the engine not starting, intermittent starting issues, or the push-button start being unresponsive.
3. What causes the B2278 code to appear?
Common causes include a faulty engine start/stop switch, damaged wiring, loose connections, or issues with the control module.
4. Can a weak battery cause the B2278 code?
Yes, a weak or failing battery can cause voltage issues that may trigger the B2278 code.
5. How do you diagnose the B2278 code in a Scion?
Diagnosis involves inspecting the engine switch, checking for damaged or loose wiring, and testing the voltage and continuity of the circuit.
6. Can I still drive my Scion with a B2278 code?
It’s not recommended, as the engine may fail to start or the issue could worsen, leaving you stranded.
7. How do you fix a B2278 code in a Scion?
Repairs may include replacing the engine start/stop switch, repairing damaged wiring, or addressing issues in the control module.
8. How much does it cost to fix the B2278 code?
Repair costs vary but typically range from $150 to $500, depending on whether the switch or wiring needs replacement.
9. Can I clear the B2278 code without fixing the problem?
Clearing the code without addressing the issue may temporarily remove the warning but won’t resolve the underlying problem, and the code will likely return.
10. Is the B2278 code specific to Scion vehicles?
No, while common in Scion models, this code can also appear in other Toyota vehicles with similar engine switch systems.
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