P3251moderate severityPowertrain
Regenerative Braking Torque Blending Fault
on 2012 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.
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P0001
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P0002
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P0003
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P0004
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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