OBD Guide
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C1085

Vacuum Pressure Sensor High

C1085 is an OBD-II diagnostic trouble code meaning: Vacuum Pressure Sensor High. Common causes: faulty vacuum pressure sensor, short circuit in the sensor power supply circuit to positive. Estimated repair cost: $22–222.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$22–222 (est.)

Symptoms

  • The ABS or stabilization system indicator is on
  • Increased force on the brake pedal (heavy pedal)
  • Diagnostic error code C1085
  • Incorrect operation of the brake booster
  • Possible increased hardness of the brake pedal

Causes

  • Faulty vacuum pressure sensor
  • Short circuit in the sensor power supply circuit to positive
  • Vacuum hose is damaged or kinked
  • Vacuum pump malfunction (on diesel engines)
  • Failure or wear of the vacuum brake booster

How to Fix

  1. Connect a diagnostic scanner and read the vacuum pressure sensor data in real time
  2. Check the vacuum hose for cracks, kinks and leaks.
  3. Measure the supply voltage and sensor signal with a multimeter
  4. Check the serviceability of the vacuum pump (if equipped) or the vacuum level at idle
  5. If a short circuit is detected, repair the wiring damage
  6. Replace the vacuum pressure sensor if it is confirmed to be faulty

Related codes

C1281C12B6C1200C1254

FAQ

What does the C1085 code mean?

C1085 is an OBD-II diagnostic trouble code that indicates: Vacuum Pressure Sensor High

What causes a C1085 error code?

The most common causes of C1085 include: Faulty vacuum pressure sensor; Short circuit in the sensor power supply circuit to positive; Vacuum hose is damaged or kinked; Vacuum pump malfunction (on diesel engines).

How do I fix a C1085 diagnostic trouble code?

To fix C1085: Connect a diagnostic scanner and read the vacuum pressure sensor data in real time. Check the vacuum hose for cracks, kinks and leaks.. Measure the supply voltage and sensor signal with a multimeter. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1085?

Yes, but get it checked soon

How much does it cost to fix C1085?

The estimated repair cost for C1085 is $22–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat