Network, generic

U0248 Lost Communication With Remote Accessory Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

No manufacturer explains publicly what the remote accessory module does or when U0248 is set. The name suggests a body-side unit that switches accessories outside the main controllers. Separate codes exist for Ford's SYNC interface unit (APIM, U0253) and for a remote start module (U0254). For the 2011 Saab 9-5, GM explains how lost-communication codes arise in general: receivers check for expected signals, some serving as a sender's heartbeat; when one stops, they fall back to default values and record a lost-contact code for that sender. The same GM code list has no entry for U0248. Any listener would follow that scheme once this module falls silent. What the driver notices depends entirely on the accessory involved; driving is unaffected. Invalid data from it are U0549.

Likely causes

Module without power or ground (fuse, connector)
Retrofitted or removed accessory, module configured but not present
Bus wiring or connector to the module damaged
Module internally faulty

Symptoms

  • Accessory function controlled by the module inoperative
  • Code stored in other modules without noticeable fault

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–600
Time0.3–3 h

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

Parts involved

remote accessory modulecan bus

Related codes

U0549U0253U0254

References: saabwisonline.com, saabwisonline.com.