C1391 on Toyota Avalon
Brake actuator accumulator pressure leak or ABS actuator fault
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Toyota Avalon context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for C1391.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
What C1391 Means on Your Toyota Avalon
C1391 on Toyota Avalon points to brake actuator accumulator pressure leak or abs actuator fault. FixIt matched 1 NHTSA owner reports for this exact code/vehicle pair, so use this page to prioritize the most likely symptoms, components, and next checks before replacing parts.
Real Toyota Avalon Owner Reports
Source: NHTSA Complaints Database
"THE AVALON HYBRIDS COVERED ONLY BY WARRANTY ENHANCEMENT ZKK ARE SUFFERING THE SAME DANGERS AND FVMSS NONCOMPLIANCE DUE TO BRAKE BOOSTER PUMP ASSEMBLY FAILURES AS THOSE TOYOTA COVERED BY SAFETY RECALLS (D0H & K0L). BY EXCLUDING AVALON HYBRIDS WITH DEFECTIVE BRAKES FROM THE D0H AND K0L SAFETY RECALLS, TOYOTA IS LEAVING T"
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on Toyota Avalon
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
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3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.