U0128Lost Communication With Park Brake Control Module
- Generic OBD-II code · Network
- Turns on the check-engine light
- How the car detects it
- U0128 signals that the electric parking brake controller has dropped off the bus. GM rates it very differently by node: the 2017 engine table waits 10 s for the park brake message and treats a miss as Type A (MIL at once), while the 2019 chassis controller (ICCM) needs only 1 s but files it as Type C without MIL; from model year 2018 GM folds this ICCM check into U0121. Saab's 9-5 list adds subtypes 71, 72 and 74 for corrupt frames. FCA names U0128 among the codes of a 2019 Cherokee 3.2 L PCM update. In GM Silverado trucks it appears with many other U codes when a harness fault upsets the whole network (PIT5713A). U0135/U0136 cover further park brake modules. The parking brake may not apply or release.
- What you may notice
- Service Parking Brake message or brake warning lamp
- Electric parking brake does not apply or release
- MIL on in vehicles where the engine controller stores it
- Likely causes
- LikelyFuse, supply or ground of the park brake module missing
- PossibleChafed or corroded bus wiring, often affecting several modules at once
- PossibleWeak battery causing the module to drop out (stored code)
- RareController software issue fixed by reprogramming
- RarePark brake control module internally faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.