Chassis, generic

C053E Brake Pressure Sensor A Circuit Low

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

The voltage on the signal line of brake pressure sensor A has dropped under the lower limit the brake module accepts. Such ratiometric 5-V sensors normally stay within a window: an older Saab 9-5 brake unit faults its pressure sensor below 0.25 V held for 0.1 s. Usual triggers are a signal wire shorted to ground, a lost 5-V feed or a sensor failing internally. GM shows a second pattern: on 2024 Silverado/Sierra 2500HD/3500HD, C053E with a MIL message at start-up came from the sensor still initializing and warming up; bulletin 24-NA-016 prescribes new EBCM software and warns against replacing the modulator valve. Mitsubishi lists C106C-16 as this code (Outlander PHEV 2023). Unlike C053F the reading is too low; unlike C053D it is electrically out of range.

Likely causes

Signal wire chafed through and touching ground
Missing or weak 5-V reference to the sensor
Module software flagging the sensor during start-up warm-up (GM HD trucks 2024)
Pressure sensor failed internally

Symptoms

  • ABS or stability control warning lamp lit
  • Message in the driver display right after start-up
  • Stability, traction control or brake assist switched off

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–1,500
Time0.3–3 h

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

Parts involved

brake pressure sensor asensor wiring

Related codes

C053DC053FC0540C0542

References: static.nhtsa.gov, mitsubishitechinfo.com, mitsubishitechinfo.com, saabwisonline.com.