P1826 GMC - Internal Mode Switch Circuit 'C' High
- Faulty Internal Mode Switch
- Internal Mode Switch harness is open or shorted
- Internal Mode Switch circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1826 Gmc DescriptionWith the engine speed at least 500 rpm for 5 seconds, Fuel Shutoff inactive, engine torque more than 20 ft-Ibs, the Powertrain Control Module (PCM) detects that the Internal Mode Switch (IMS) 'C' signal was in a high state while the gear ratio indicated 1st, 2nd or 3rd gear, condition met for 0.5 seconds.
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