C1220 FORD, LINCOLN, MERCURY: YELLOW ABS WARNING INDICATOR FAILURE
POST UPDATED IN May, 2023
C1220 Code failures by brands
Description of DTC code C1220
ABS (Anti-lock Brake System) is used as a standard safety feature on modern automobiles. It prevents the wheels from locking up and also helps them maintain grip according to driving conditions.
Generally, the Anti-lock Braking System is integrated into the Electronic Stability Control, which is responsible for monitoring the moments when the wheels brake. There is a sensor on each wheel, which, upon detecting possible wheel locking, momentarily releases the braking system. Subsequently, the ABS continuously applies the optimum braking pressure for each wheel, thus ensuring the necessary braking to prevent the wheels from locking.
The C1220 OBDII diagnostic code is stored on Ford, Lincoln, and Mercury vehicles when the ABS malfunction warning lamp exhibits erratic operation.
Symptoms of fault code C1220
- Check Engine light comes on.
- ABS fault light may stay on or flash intermittently.
Causes of OBD2 C1220
DTC C1220 OBD2 is set for one of the following reasons:
- ABS warning lamp wires may have damage.
- Lamp circuit may be shorted or open.
- The Anti-lock Braking System warning lamp may be defective.
Possible solutions of the DTC code C1220
The steps to troubleshoot the C1220 OBDII fault code are as follows:
- Consult the TSB.
- Check the ABS warning lamp wiring to verify that they are not damaged by burns or wear. If one of these conditions is detected, make the appropriate repairs or replacements.
- Check the Anti-Lock Brake System warning lamp circuit for shorts or opens. If these tests reveal poor voltages, make the necessary corrections. Otherwise, suspect a faulty lamp.
