Issue: a customer may report the vehicle steering feels heavy potentially accompanied by visual or audible...

Bulletin number

SSM71278

Component

Electrical system: 12v/24v/48v battery

Summary

"issue: a customer may report the vehicle steering feels heavy potentially accompanied by visual or audible warnings through the instrument pack. The following dtcs may also be logged: epas dtcs logged: -b1304-16: electronic power assisted steering (epas) system circuit voltage below threshold -u3001-00: power steering control module (pscm) system improper shutdown. These may be accompanied by: -u0001-87 / 88 high speed can bus invalid serial data received / missing message. Chcm dtcs logged: -u0131-00 chassis control module (chcm) lost comms with pscm. -u3003-62 battery voltage signal compare failure. -u0420-68 chcm invalid data received from pscm. Cause: this may be caused by: -low battery voltage. -wiring harness issue (short / open circuit, high resistance). -high resistance at epas earth terminal (for l405/l494) g1d132 and or g4d178, (see attached diagram). Or if on l550/l538 high resistance at g1d122a, g1d122b, g1d122az and g1d108."

Owners of these vehicles have filed 70 complaints in the electrical category.