Chassis, generic

C05D3 Driver Applied Pressure Higher Than Expected

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

The pressure the driver generates is higher than the measured pedal travel would predict, a hard pedal pattern. GM's integrated controller sets C05D3 when the measured simulator pressure is more than 20 bar above its travel-based model, outside fast applications, naming a closed or blocked simulator valve, a seized simulator and an in-range sensor fault. The booster-type EBCMs (XT4, 23OBDG07, 25OBDG03B) call the check hard pedal and react after 0.2 s without ABS or ESC activity; Type A with MIL. GM PIT6012/PIT6012A for 2023-2024 Colorado and Canyon pair C05D3 with P25A2, a lit check engine lamp and a soft pedal, and point first to a weak battery. Bosch maps the same hard-pedal zone over input rod stroke.

Likely causes

Weak or discharged 12 V battery (GM PIT6012)
Pedal simulator valve closed or blocked
Pedal simulator piston seized
Pressure or travel sensor misreading within range

Symptoms

  • Check engine lamp on together with brake system message
  • Brake pedal feels spongy, hard or unusual

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–2,500
Time0.5–4 h

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

Parts involved

pedal simulatorbrake pressure sensorbrake system control module

Related codes

C05D2C05D5C053D

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.