Keyless Entry Antenna 3
Table of contents
B3121 CADILLAC Possible Causes
- Faulty Keyless Entry Antenna Rear Fascia
- Keyless Entry Antenna Rear Fascia harness is open or shorted
- Keyless Entry Antenna Rear Fascia circuit poor electrical connection
- Faulty Keyless Entry Control Module
How do I fix code B3121 CADILLAC?
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 B3121 CADILLAC code
The cost of diagnosing the B3121 CADILLAC 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)
B3121 CADILLAC Description
The rear fascia antenna is located in the rear fascia assembly and is used to establish low frequency communications with the keyless entry transmitter. As a vehicle with locked doors is approached with a keyless entry transmitter and the exterior rear closure touch pad is pressed, the Keyless Entry Control Module communicates with the rear fascia keyless entry antenna. The Diagnostic Trouble Code (DTC) sets when the keyless entry control module detects a short to ground on the rear fascia keyless entry antenna signal circuit.