P3251moderate severityPowertrain
Regenerative Braking Torque Blending Fault
on 2010 Toyota Highlander 3.3L V6 Hybrid · AWD
What this code means
The system cannot properly blend regenerative braking with conventional hydraulic braking. The transition between regen and friction braking is abrupt or inconsistent.
Symptoms
- Jerky braking feel
- Inconsistent brake pedal response
- Brake pedal pulsation during blending
- ABS activation at low speeds
- Unexpected deceleration changes
- Brake noise during regen transition
Common causes
- Brake actuator malfunction
- Regen torque estimation error
- Motor response delay
- Brake hydraulic unit fault
- Wheel speed sensor disagreement
Diagnostic steps
- Monitor regen and friction brake torque simultaneously
- Check brake actuator operation
- Inspect wheel speed sensor signals
- Test brake hydraulic unit solenoids
- Compare deceleration rate to commanded braking
Repair notes
Recalibrate brake blending system. Replace brake actuator if faulty. Software update may be available for improved blending.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1