Uploaded May 2023 | Updated September 2026, 3 weeks ago
Greetings viewers and welcome back to the channel. In todays production we have a Chevy TrailBlazer ( AKA GMC Envoy Isuzu Ascender ) that arrived with a customer complaint of an illuminated check engine light and reduced engine power warning. The vehicle had stored active codes U1000, P0452, P1221, P1271, P1635 and P1481. All related to a common 5 volt reference circuit of the powertrain control system. Come along for a quick tutorial on the diagnosis and repair for this common issue. Here is a link to the time saving video I mentioned in this vid: youtu.be/q95mBkgku3o
Subscribe now to The Car Doctor Channel
Greetings viewers and welcome back to the channel. In todays production we have a Chevy TrailBlazer ( AKA GMC Envoy Isuzu Ascender ) that arrived with a customer complaint of an illuminated check engine light and reduced engine power warning. The vehicle had stored active codes U1000, P0452, P1221, P1271, P1635 and P1481. All related to a common 5 volt reference circuit of the powertrain control system. Come along for a quick tutorial on the diagnosis and repair for this common issue. Here is a link to the time saving video I mentioned in this vid: youtu.be/q95mBkgku3o
Subscribe now to The Car Doctor Channel
