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Tech Tool When ECU Programming Solution

Volvo Tech Tool PTT V2.8.100

Error 121 is a generic “failed to program” message, so this can have several causes.

Tech Tool 2.8.130

Solution 1:

One common cause is low battery Voltage to the ECU that is being programmed.

Solution 2:

Check all connections, and ensure that the vehicles batteries are good and

fully charged. You can also remove power from the ECU that is being programmed, wait,

connect, and try a second time.

Solution 3:

If you still get error 121, remove power for a short time, try again with a different adapter.

Vocom , NexIQ, Noregon DLA  or Dearborn.

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