Engine-Codes - Generic - B1240

B1240 Code - Start Button Mode Indicator Circuit Short

- Code Popularity: 8,727 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
What is this?
Table of contents
What does this mean?

|What are the Possible Causes of the Code B1240?

  • 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 B1240 Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Search B1240 Questions and Answers
What does this mean?

|Code B1240 Tech Notes

B1240:11 Start Button Mode Indicator Circuit Short to Ground
B1240:15 Start Button Mode Indicator Circuit Short to Battery or Open

|What is the Cost to Diagnose the Code B1240?

Labor: 1.0

The cost to diagnose the B1240 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

Does your Car have Safety Recalls? → Check here

|What are Code B1240 Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the B1240 Code Mean?

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. The FET receives fused battery voltage from BCM. When the start/stop switch is pressed a voltage and ground signal are sent to the BCM. When the vehicle enters RUN or START mode, the BCM forward biases the FET which provides voltage to the amber LED in the start/stop switch, illuminating the word ENGINE.

B1240 Code - Start Button Mode Indicator Circuit Short

|Need more Information on the B1240 Code?

Need more information on how to fix the B1240 code? Get Access to Factory Service Manuals

|Code B1240 Information for Specific Makes

  • B1240 Acura Problem In The Mode Control Linkage, Doors, Or Motor Circuit
  • B1240 Ford Start Button Mode Indicator Circuit Short
  • B1240 Honda Problem In The Mode Control Linkage, Doors, Or Motor Circuit
  • B1240 Lincoln Start Button Mode Indicator Circuit Short
  • B1240 Mercury Start Button Mode Indicator Circuit Short

|Need Help with the B1240 Code?

Get the B1240 code diagnosed by a professional: Find a repair shop in your area

Related Information