C0268Brake Pump Run Time Exceeded
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0268 appears in no public J2012 table. It is a GM number named in PIP5094, and AA1Car repeats for it the wording of C0267, Pump Motor Circuit Open/Shorted. A run-time limit as in the title is documented by no maker for this code. Why pump run time matters is shown by a Kelsey-Hayes patent for GM-type ABS: one DC motor drives the return pumps that empty the low-pressure accumulators after the dump valves open; if the motor runs too slowly the accumulators fill and pressure at the wheel can no longer be lowered. The patent starts the motor at full voltage for about 0.3 s, then regulates speed by PWM and back EMF. A motor running too long or too slow points to wear, low voltage or a poor ground.
- What you may notice
- ABS warning lamp on, ABS and traction control disabled
- Pump runs audibly long during self-test or ABS events
- Likely causes
- PossibleWorn or sluggish ABS pump motor
- PossibleLow supply voltage or poor ground at the pump motor circuit
- PossibleOpen or shorted pump motor wiring or connector (GM wording)
- Repair
- Hard · Usually a job for a workshop.Typical cost: €30 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.