P1820 GMC - Internal Mode Switch Circuit 'A' Low
- 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)
P1820 Gmc DescriptionWith the engine runtime over 5 seconds, system voltage from 8-18v, Fuel Cutoff inactive, engine torque from 30-148 ft-lb (40-200 Nm), the Powertrain Control Module (PCM) detects that the Internal Mode Switch (IMS) signal indicated PARK for 2 seconds and then the IMS indicated a transitional state between D4 and D3, conditions met for 5 seconds.
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