B1240 Ford Code - Start Button Mode Indicator Circuit Short
Quick Answer
The Body Control Module (BCM) uses a Field Effect Transistor (FET) as circuit protection for the start/stop switch indicator and as an electronic switch to turn the start/stop switch indicator on and off. Common causes include Faulty Start/Stop Switch Indicator, Start/Stop Switch Indicator harness is open or shorted, Start/Stop Switch Indicator 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
- B1240 Ford indicates Start Button Mode Indicator Circuit Short.
- Common causes
- Common causes include Faulty Start/Stop Switch Indicator, Start/Stop Switch Indicator harness is open or shorted, Start/Stop Switch Indicator 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 B1240 Ford Description
What are the Possible Causes of the DTC B1240 Ford?
- Faulty Start/Stop Switch Indicator
- Start/Stop Switch Indicator harness is open or shorted
- Start/Stop Switch Indicator circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC B1240 Ford?
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
B1240:15 Start Button Mode Indicator Circuit Short to Battery or Open
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B1240 Ford 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.
Need more information about the B1240 Ford code?
Need more information on how to fix the B1240 Ford code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B1240 Ford code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about B1240 Ford Code
1. What does the OBDII code B1240 mean for a Ford vehicle?
B1240 indicates a Start Button Mode Indicator Circuit Short, meaning there’s an electrical issue in the circuit responsible for illuminating the start button mode indicator light.
2. What are the common symptoms of code B1240?
Symptoms include the start button mode indicator light not functioning, intermittent illumination, or other dashboard electrical issues.
3. What causes the B1240 code in Ford vehicles?
The code is typically caused by a short circuit, damaged wiring, a faulty start button mode indicator, or a problem with the associated control module.
4. Can a blown fuse cause code B1240 on a Ford?
Yes, a blown fuse in the circuit can interrupt power flow and trigger the B1240 code.
5. How do you diagnose the B1240 code on a Ford vehicle?
Diagnosis involves inspecting the wiring and connectors for damage, checking the start button mode indicator light, and testing the control module for faults.
6. Is it safe to drive with the B1240 code active?
While the vehicle may still start, the code could indicate a larger electrical issue that should be addressed to avoid further complications.
7. How do you fix a B1240 code on a Ford vehicle?
Repairs may include replacing damaged wiring, fixing shorts, replacing the start button mode indicator light, or repairing/replacing the control module.
8. How much does it cost to repair code B1240 on a Ford?
Repair costs vary depending on the issue but could range from $50 for simple wiring repairs to several hundred dollars for control module replacement.
9. Can I clear the B1240 code without fixing the problem?
Clearing the code without addressing the root cause may temporarily remove the error, but the code will likely return.
10. What tools are needed to troubleshoot code B1240 on a Ford?
You’ll need an OBDII scanner, a multimeter, and basic tools for inspecting and repairing wiring and electrical components.
Discuss the causes and fixes for B1240 Ford OBDII Code
Code B1240 Ford comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
