Performing any of the following repairs may require you to initiate a computer relearn procedure in order to restore proper vehicle operation.

Powertrain Control Computer replacement with a nontransferable PROM
Powertrain Control Computer reprogramming
Body Control Computer
Instrument Cluster replacement
Engine replacement
Crankshaft replacement
Crankshaft harmonic balancer replacement
Crankshaft position sensor replacement
Diesel Engine controller
Diesel engine PCM with or without injection pump replacement
Diesel engine front cover replacement.

Here are some helpful tips to perform the system relearn, depending upon the particular repair that you have performed.

Powertrain Control Computer Replacement with a nontransferable PROM

All computers being replaced must be reprogrammed or “reflashed”. This is so the replacement computer has the most up-to-date information for that particular vehicle. This information is specific for the vehicle based on the vehicle identification number, and cannot be used on another vehicle, even though they may appear to be similar. Relearn procedures involve: Crankshaft Variation (CASE Learn), Engine Idle speed, Theft Deterrent password, and Transmission adaptive shift points.

Powertrain Control Computer Reprogramming

If diagnostics reveal that a reprogram or re-flash of the computer is necessary, relearn procedures involve:

Crankshaft Variation (CASE Learn), Engine Idle speed, Theft Deterrent password, and Transmission adaptive shift points. Body Control Computer &/or Instrument Cluster replacement Theft deterrent password relearn is necessary. Engine, crankshaft, harmonic balancer, and crankshaft position sensor. If any of the above items are replaced, then a Crankshaft Variation relearn is necessary.