C001A
Left Rear Hydraulic Release Too Long
What it means
C001A means Left Rear Hydraulic Release Too Long.
Check these first
- A restricted or blocked left rear brake hydraulic line
- A failing left rear wheel speed sensor
- Low or contaminated brake fluid
- A fault in the ABS module programming
- A bad brake pressure sensor or its calibration
What to do next
- Check brake fluid level and condition
- Inspect the left rear brake hydraulic circuit for blockages and restricted lines
- Check the left rear wheel speed sensor and its connector
- Read other stored codes that point to the same fault
- Replace the ABS module or have it reprogrammed if the release time stays long
- Clear the code and retest the ABS system
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.