ABS Booster Control Pressure Signal Amplitude
Table of contents
C1021 MERCURY Possible Causes
- Other Diagnostic Trouble Codes (DTCs) present in Anti-Lock Brake System (ABS) Module
- Brake fluid leak
- Air trapped in the brake system
- Master cylinder
- Brake booster
- ABS module
How do I fix code C1021 MERCURY?
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.
Tech Notes
- C1021:21 ABS Booster Control Pressure: Signal Amplitude < Minimum
- C1021:22 ABS Booster Control Pressure: Signal Amplitude > Maximum
Cost of diagnosing the C1021 MERCURY code
The cost of diagnosing the C1021 MERCURY 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
- Anti-Lock Brake System (ABS) Warning Light ON
- Engine Light ON (or Service Engine Soon Warning Light)
C1021 MERCURY Description
The Anti-Lock Brake System (ABS) Module uses several pressure sensors to monitor the brake system by comparing the input of the pressure sensors to other sensor input. This DTC indicates that other DTCs are present for the brake pedal angle sensor, the vacuum pressure sensor or a brake (fluid) pressure sensor.