C1302

What the Code Means

Code C1302 indicates an open circuit in the brake fluid pressure sensor. The sensor sits inside the ABS unit, and this fault is typical of ATE MK60 systems. With the circuit open, the DME/DSC gets no pressure signal, which shuts down ABS and DSC.

Symptoms

• ABS and DSC warning lights come on in the instrument cluster
• Brake fluid pressure sensor fault stored in DSC memory
• Possible loss of ABS and DSC functions

Diagnosis and Repair

Step 1: Scan the Codes

Connect ISTA or INPA and read the DSC fault codes. Confirm C1302 is present.

Step 2: Check the Wiring and Sensor

• Inspect the wiring harness to the ABS unit for damage, corrosion, or breaks.
• Check the pressure sensor resistance with a multimeter (refer to the technical documentation).

Step 3: Replace or Repair the ABS Unit

If the sensor is faulty and built into the unit, you'll need to replace or repair the ABS unit (ATE MK60). Resoldering or swapping in a recycled/donor ABS unit is possible.

Step 4: Bleed the Brake System

After replacing the ABS unit, bleed the brake system (use ISTA to activate the ABS pump).

Step 5: Clear the Codes

Clear the fault codes and take a test drive to verify the repair.

Secondary Problems

Ignoring C1302 leads to a complete loss of DSC and ABS. That raises the risk of an uncontrolled skid under hard braking or on a slippery surface. In a critical situation the car can lose directional stability, which increases the chance of a crash. Don't sit on this one — fix it fast.