OBD Guide
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C1202

Master Reservoir Level Malfunction

C1202 is an OBD-II diagnostic trouble code meaning: Master Reservoir Level Malfunction. Common causes: low brake fluid level, malfunction of the brake fluid level sensor. Estimated repair cost: $11–167.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–167 (est.)

Symptoms

  • CHECK BRAKE or ABS light is on
  • Reduced braking performance
  • Disabling the ABS/ESP system
  • Adaptive Cruise Control Malfunctions (If Equipped)

Causes

  • Low brake fluid level
  • Malfunction of the brake fluid level sensor
  • Open or shorted wiring harness
  • Sensor contact corrosion
  • Brake fluid leak in the system

How to Fix

  1. Visually check the brake fluid level
  2. Inspect the system for leaks
  3. Check the condition of the liquid level sensor
  4. Diagnose sensor resistance and voltage
  5. Check the integrity of the wiring harness
  6. If necessary, replace the sensor or repair the leak.
  7. Reset the error and check the system

Related codes

C1201C1203C1210

FAQ

What does the C1202 code mean?

C1202 is an OBD-II diagnostic trouble code that indicates: Master Reservoir Level Malfunction

What causes a C1202 error code?

The most common causes of C1202 include: Low brake fluid level; Malfunction of the brake fluid level sensor; Open or shorted wiring harness; Sensor contact corrosion.

How do I fix a C1202 diagnostic trouble code?

To fix C1202: Visually check the brake fluid level. Inspect the system for leaks. Check the condition of the liquid level sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1202?

Limited driving only, diagnose soon

How much does it cost to fix C1202?

The estimated repair cost for C1202 is $11–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat