C0550: ECU Malfunction (Chassis)
3 vehicles · 2 makes · $250-$3,200 repair
C0550 is an OBD-II diagnostic trouble code meaning “ECU Malfunction (Chassis).” The ABS/stability control ECU has detected an internal malfunction. This code appears across 3 vehicle models from 2 manufacturers, with repair costs ranging from $250 to $3,200.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose C0550, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (3)
FAQ
What does C0550 mean?
C0550 stands for "ECU Malfunction (Chassis)." The ABS/stability control ECU has detected an internal malfunction.
What are the most common causes of C0550?
The most common causes of C0550 are: ABS module failure, Internal relay fault, Power supply issue, Software corruption, Pump motor circuit fault. The specific cause varies by vehicle.
How much does it cost to fix C0550?
Repair costs for C0550 range from $250 to $3,200, depending on the vehicle and root cause.
Which vehicles are affected by C0550?
Au7o has documented C0550 across 3 vehicle models from 2 manufacturers: Chevrolet, GMC.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.