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Home/DTC Codes/Cadillac/SRX/2007-2007 3.6L V6/C0090
C0090

Brake Booster Pressure Sensor Circuit

2007-2007 Cadillac SRX 3.6L V6

Moderate SeverityChassisGeneric (SAE)

The 2007 Cadillac SRX is equipped with a 3.6L V6 engine. Below you'll find detailed c0090 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

Description

Malfunction in the brake booster vacuum or pressure sensor circuit.

Symptoms

  • Brake warning light on
  • Hard brake pedal
  • Increased stopping distance
  • Check Engine Light may also be on

Common Causes

  • Faulty brake booster pressure sensor
  • Vacuum hose leak
  • Wiring damage
  • Brake booster vacuum pump failure on diesel/turbo vehicles

Diagnostic Steps

  1. Test brake booster vacuum with gauge
  2. Check vacuum hose to booster
  3. Test pressure sensor signal
  4. Inspect wiring and connector
  5. Check engine vacuum source

Repair Notes

Repair vacuum leak or replace pressure sensor. On diesel vehicles, check vacuum pump.

Related Codes

C0085Brake Pressure Sensor CircuitC0091Brake Booster Performance

Other Chassis Codes

C0090 on Other Vehicles

Cadillac ATS

2013-2013 2.0L Turbo I4

Cadillac ATS

2013-2013 2.5L I4

Cadillac ATS

2013-2013 3.6L V6

Cadillac ATS

2014-2014 2.0L Turbo I4

Cadillac ATS

2014-2014 2.5L I4

Cadillac ATS

2014-2014 3.6L V6

Cadillac ATS

2015-2015 2.0L Turbo I4

Cadillac ATS

2015-2015 2.5L I4

Common Questions

What does code C0090 mean on a 2007-2007 Cadillac SRX?

C0090 stands for "Brake Booster Pressure Sensor Circuit". Malfunction in the brake booster vacuum or pressure sensor circuit.

What are the symptoms of C0090 on a Cadillac SRX?

Common symptoms of C0090 include: Brake warning light on, Hard brake pedal, Increased stopping distance, Check Engine Light may also be on.

What causes C0090 on a 2007-2007 Cadillac SRX?

Common causes of C0090 include: Faulty brake booster pressure sensor, Vacuum hose leak, Wiring damage, Brake booster vacuum pump failure on diesel/turbo vehicles.

Last updated: March 2026

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