Network, generic

U0170 Lost Communication With Restraints System Sensor A

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

U0170 is the first slot in the J2012 block for remote restraint sensors: sensor A has gone silent for the airbag control unit or another listener. Chrysler follows that scheme. In the Jeep airbag tables it handed to NHTSA (Wrangler JK 2007-2010, Compass/Patriot MK, Liberty KK, Grand Cherokee WK and Commander XK 2008) U0170 is the up-front left satellite acceleration sensor, and B1B70 reports an internal fault of that same part. GM assigns the number differently: the Saab 9-5 and 9-4X U-code lists give it to the passenger presence detection module, and GM bulletin PI1202 shows the SDM logging U0170 on 2013-14 Enclave, Traverse and Acadia when a harness rubbing on the exhaust disturbs the LAN. Airbag lamp on, no MIL.

Likely causes

Connector at the front satellite sensor unplugged or corroded, often after front-end repairs

Sensor A or its bracket damaged in a frontal knock

On GM vehicles (passenger presence module) chafed or pinched low-speed LAN wiring

Sensor input of the airbag control unit faulty

Symptoms

Airbag warning lamp on
Early frontal crash detection on the left reduced (Chrysler)
On GM vehicles further U-codes in several modules at the same time

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€80–700

Time0.5–3 h

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

Parts involved

restraints system sensor acrash signal wiring

Related codes

U0151 U0154 U0171 U0172 U0471

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