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P1635 Diagnostic Trouble Code Discussion for February 2006

5-Volt Reference 'A' Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1635
Help Request Posted
2002 Chevrolet Trailblazer LS 4.2L throttle VIN: 1GNDT13S02
P1635: 5-Volt Reference 1 Circuit Malfunction. ... Trailblazer that keeps coming back with fault codes (P1221 excessive difference between throttle position sensors, P1271 excessive difference between acceleator pedal position sensors, P1635 5v ref. A circuit) The first time when testing, fan clutch circui...
February 18, 2006