C1021 FORD - ABS Booster Control Pressure Signal Amplitude

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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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

Tech notes

C1021:21 ABS Booster Control Pressure: Signal Amplitude < Minimum
C1021:22 ABS Booster Control Pressure: Signal Amplitude > Maximum

Possible symptoms

  • Anti-Lock Brake System (ABS) Warning Light ON
  • Engine Light ON (or Service Engine Soon Warning Light)

C1021 Ford 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.
OBDII Code C1021 Ford - ABS Booster Control Pressure Signal Amplitude - AutoCodes.com

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C1021 FORD Comments

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