Chassis, generic

C0268 Brake Pump Run Time Exceeded

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Worn or sluggish ABS pump motor
Low supply voltage or poor ground at the pump motor circuit
Open or shorted pump motor wiring or connector (GM wording)

Symptoms

  • ABS warning lamp on, ABS and traction control disabled
  • Pump runs audibly long during self-test or ABS events

Repair estimate

DifficultyHardWorkshop job
Parts and labour€30–1,500
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

brake pump motorabs hydraulic unitabs control module

Related codes

C0267C0110C0269

References: static.nhtsa.gov, aa1car.com, patents.google.com.