2002 Chevy Trailblazer EXHAUST CAMSHAFT POSITION TIMING BAN

I will need the full VIN from the vehicle.

Here is a bulletin for this problem. Subject: On-Board Diagnostic (OBD) System Improvements -- Service Engine Soon Light On, DTC P0014, P0116 or P1683 Set, Delayed Transmission Downshift and/or Excessive Fan Noise, ID # YT04032 (Reprogram PCM) Models: 2002 Chevrolet TrailBlazer

2002 GMC Envoy

2002 Oldsmobile Bravada

with 4.2L Inline 6-Cylinder Engine (VIN S - RPO LL8)
Built Prior to the following VIN Breakpoints:

Vehicle
VIN Breakpoint

Chevrolet TrailBlazer
22244600

GMC Envoy
22244601

Oldsmobile Bravada
22244597
Some customers may comment on the Service Engine Soon lamp being illuminated, a delayed transmission downshift and/or excessive fan noise. Upon investigation, the technician may find either a DTC P0014 (Cam Phaser Performance), DTC P0116 (High Sided Coolant Rationality) and/or DTC P1683 (Low Power Counter Failure). Reprogram the powertrain control module (PCM) on all affected vehicles, as identified above, including vehicles in new dealer inventory, used inventory, and any that return for service in or out of warranty.