Engine-Codes - Lincoln - B1240 LINCOLN

B1240 LINCOLN - Start Button Mode Indicator Circuit Short

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

B1240 LINCOLN Possible Causes

  • 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 is the B1240 LINCOLN code repair?

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.

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 B1240 LINCOLN code

Labor: 1.0

The cost to diagnose the B1240 LINCOLN code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

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

B1240 LINCOLN Meaning

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.

More Information

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