Chassis, generic

C059E Brake Pressure Sensor E Missing Calibration

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modePossible

C059E reports that sensor E, one more pressure sensor in a multi-sensor brake unit, has never been calibrated successfully or that its record is lost. No maker documents C059E publicly; for sensor E only the circuit codes C059F–C05A2 exist. GM's published logic for related sensors shows what can go wrong: for its pedal travel sensor (C05D4) the stored status reports a failed zeroing if the sensor had an electrical fault, the car moved or the brake was applied during calibration, or the offset was too big, too small or unsteady. For pressure sensor A GM's 2025 tables check only the status flag, 500 ms after wake-up, Type A. Saab lists module or modulator replacement as reasons to recalibrate. Rerun the calibration with the car stationary and the pedal untouched.

Likely causes

Calibration run while the vehicle moved or the brake pedal was pressed

Calibration skipped after replacing the brake module or hydraulic unit

Sensor offset too large or unstable so the calibration is rejected

Symptoms

ABS/ESC or brake system warning lamp on
Brake assist or stability functions disabled

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€60–300

Time0.3–1.5 h

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

Parts involved

brake pressure sensor ebrake control module

References: gsi.ext.gm.com, gsi.ext.gm.com, saabwisonline.com.