Back to 2004 Cadillac SRX
Help
2004 CADILLAC SRX
3.6L V6•AWD•AUTOMATIC•gas
7 active safety recalls on this vehicle — view recalls
Founding sponsor spot is openYour name on every procedure for this vehicle, permanently.Sponsor — $99 →
Repairs0Labor958Torque4237Fluid18DTC2122Battery2Maintenance0Recalls7
C0086moderate severityChassis

Master Cylinder Pressure Sensor Circuit Low

on 2004 Cadillac SRX 3.6L V6 · AWD

What this code means

Low voltage from the master cylinder brake pressure sensor, indicating a circuit fault.

Symptoms

  • ABS light on
  • Stability control disabled
  • Brake assist may not function
  • Regenerative braking malfunction on hybrids

Common causes

  • Sensor short to ground
  • Faulty pressure sensor
  • Connector pin damage
  • Low battery voltage to sensor

Diagnostic steps

  1. Test sensor supply voltage
  2. Check signal wire for shorts to ground
  3. Inspect sensor connector
  4. Test sensor output while pressing brake pedal
  5. Check for related ABS module codes

Repair notes

Replace master cylinder pressure sensor. Verify supply voltage.

🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITE
Shop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Other Chassis codes on this vehicle

🔌 Need this data in your app? It's all in the free API →
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
Stuck on this repair? Take it to The Diag Desk — ask a master tech about this exact car → real human answer within 24h, never AI
Share:XRedditFBWhatsAppThreadsEmail
⚠ STILL BEHIND THE PAYWALL
The 2004 Cadillac SRX repair data is incomplete because no one has sponsored it yet. For $99, we generate the full step-by-step procedures, then fact-check them with a second AI pass and your expert review. Your name on every procedure, permanently.
The same data would cost $169/mo from Mitchell1 or $30/year from ALLDATAdiy — and you'd be renting access, not freeing it. Sponsor once, free forever.
Sponsor the Cadillac SRX — $99 →
Building an app?
Free API access to all this data — 10 requests/day, no card required.
Get an API key →
Run a shop?
Manage repairs, estimates, and customers with ShopBase — $249/mo, all features included.
Try ShopBase →