B1240 Lincoln 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 Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- B1240 Lincoln 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
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code B1240 Lincoln Description
What are the Possible Causes of the DTC B1240 Lincoln?
- 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 Lincoln?
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 Lincoln 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 B1240 Lincoln Code
1. What does the OBDII code B1240 mean on a Lincoln?
The B1240 code indicates an issue with the Start Button Mode Indicator Circuit, typically involving a short to ground or short to power.
2. What are common symptoms of the B1240 code?
Symptoms may include the start button indicator light not functioning, intermittent starting issues, or warning lights on the dashboard.
3. What causes the B1240 code on a Lincoln?
Common causes include damaged wiring in the start button circuit, a faulty start button assembly, or a malfunctioning Body Control Module (BCM).
4. How is the B1240 code diagnosed?
A technician will inspect the start button circuit wiring, test the start button for continuity, and use a scan tool to check for additional related codes.
5. Can I drive my Lincoln with a B1240 code?
While the car may still be operable, ignoring this code can lead to starting issues or further electrical damage, so it’s best to address it promptly.
6. How can I fix the B1240 code on my Lincoln?
Repairs may involve replacing damaged wires, fixing electrical shorts, or replacing the start button or BCM if found defective.
7. How much does it cost to repair the B1240 code?
The cost depends on the cause but can range from $50 for minor wiring repairs to several hundred dollars if the BCM or start button requires replacement.
8. Can a weak battery cause the B1240 code?
A weak or failing battery may contribute to electrical issues but is not a direct cause of this specific code.
9. Does the B1240 code require reprogramming the BCM?
If the Body Control Module is replaced, it may need to be programmed to match your vehicle's specifications.
10. Can I clear the B1240 code without fixing the problem?
Clearing the code without addressing the root cause will likely result in the code returning and potential worsening of the issue.
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