P1626 - 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, 12:48 PM   #1
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Default P1626



Vehicle operation is disabled if incorrect key or starting
procedure is used. Theft deterrent module enables crank circuit to
starter and sends a signal to PCM if correct key is being used. If
proper signal does not reach PCM fuel enable signal circuit, PCM will
not pulse injectors on, disabling vehicle, even if crank circuit is
by-passed. Signal should be 40-60 Hz and is measured using DVOM in
Hertz scale.

Engine will not run


  • PCM detects incorrect signal on Theft Deterrent System (TDS)
    fuel enable circuit.

  • Check for faulty connection at TDS module.
  • Replace VTD module.
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