P0705 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

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Old 09-27-2009, 03:36 PM   #1
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Default P0705



Transaxle Range Switch (TRS) is part of Park/Neutral Position
(PNP) switch. Inputs from TRS indicate to PCM which position is
selected by gear selector lever. PCM uses this information for
ignition timing, EVAP canister purge, EGR and IAC valve operation.
Combination of 4 TRS input states determine PCM commanded
shift pattern. Input voltage level at PCM is high when TRS is open,
and low when TRS is closed. A problem which causes PCM to detect an
invalid transaxle range input combination will set DTC P0705.

You likely won't notice any drivability problems.

  • TRS inputs indicate an invalid combination for more than
    10 seconds.
  • Check if TRS 4-pin harness connector is disconnected or
  • Check for faulty connection at TRS 4-pin and 7-pin
  • Replace TRS.
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