Electronic Shifter Power Supply Circuit Short To Ground
Table of contents
B21F7 RAM Possible Causes
- Faulty Brake Lamp Switch
- Brake Lamp Switch harness is open or shorted
- Brake Lamp Switch circuit poor electrical connection
- Faulty Body Control Module (BCM)
How do I fix code B21F7 RAM?
Check 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.
Cost of diagnosing the B21F7 RAM code
The cost of diagnosing the B21F7 RAM code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B21F7 RAM Description
The Body Control Module (BCM) monitors the Electronic Shifter Power Supply Circuit. When the Body Control Module (BCM) detects a short to ground on the Brake Lamp Switch Output circuit and the stop lamp switch is activated four times.