itd help to have the serial number
but according to the book i have:
code 5D
no SMARTi system response
according to this you should have 1 mph speed restriction
check the cable from the system card to SMARTi module
onthe system card its a serial cable just above the fuses on the large card connector JPS9
the connector on the SMARTi module is JR1
other than that it might be a bad SMARTi module or a bad VFC (vehicle function card)
but this info really depends on the serial number
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