2011 Lexus RX450h – ABS Warning Lights With C1391
- Aug 16
- 1 min read
CUSTOMER CONCERN
Customer reports multiple ABS warning lights illuminated with DTC C1391. The pump and accumulator assembly had been replaced previously, but the warning lights and code returned after approximately 200 miles.
CAUSE
Diagnosis confirmed an internal leak and failure in the ABS actuator and electronic control unit. The accumulator pressure did not remain within specification, causing C1391 to reset after the separate pump and accumulator repair.
CORRECTION
Remove and replace the ABS actuator and electronic control unit assembly. Perform the required brake bleeding procedure, clear DTCs, and verify ABS system operation.