ABS/TCS Hydraulic Response Time Fault
The ABS/TCS control module has detected that the time required to apply or release brake hydraulic pressure during a traction control event has exceeded the calibrated limit. This indicates degradation in the hydraulic system's ability to respond to module commands within the expected timeframe, typically due to pump wear, accumulator failure, or hydraulic circuit issues.
1. Commonly Affected Makes
2. Most Common Causes
- Defective ABS/TCS hydraulic pump or worn pump motor
- Hydraulic pressure accumulator with lost nitrogen charge or internal leak
- Brake pressure transducer out of range or faulty
- Low brake fluid level or air in the hydraulic circuit
- Open, short, or high resistance in pump/motor/transducer wiring or connectors
- Internally faulty ABS/TCS control module (HCU/EBCM)
3. Symptoms You Will Notice
- ABS or traction control warning light illuminated
- Reduced or inoperative traction control
- Soft or spongy brake pedal
- Unusual pump motor noise or extended run time
4. Step-by-Step Diagnosis
Check brake fluid level and condition; bleed brakes if air is suspected.
Scan for additional ABS/TCS codes and record freeze frame data.
Test hydraulic pump motor operation and current draw.
Inspect wiring and connectors at pump, transducer, and module for damage or corrosion.
Check accumulator pre-charge (if accessible) and pressure transducer output with a scan tool.
If all else passes, replace the HCU/EBCM module.
5. Frequently Asked Questions
Is it safe to drive?▼
Driving is possible but not recommended, as traction control may be degraded and braking performance could be affected. Have the system inspected promptly.
How much does it cost to fix?▼
Repair costs typically range from $200 to $1,200 depending on the root cause, with pump or module replacement being the most expensive.