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P1819 - Internal Mode Switch

Possible causes
- Faulty Internal Mode Switch
- Internal Mode Switch harness is open or shorted
- Internal Mode Switch circuit poor electrical connection
What does this mean? What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1819 Description

With the key in Start (crank) position, system voltage from 9-18v, the Powertrain Control Module (PCM) detects an invalid combination of Internal Mode Switch signals, or a set of signals that indicated a transitional state between gear positions, condition met for 0.5 seconds.

P1819 Information for specific makes
P1819 BUICK Internal Mode Switch
P1819 CADILLAC Internal Mode Switch
P1819 CHEVROLET Internal Mode Switch
P1819 FORD Transmission Neutral Safety Switch Short Circuit To Ground
P1819 GMC Internal Mode Switch
P1819 INFINITI Transfer Control Device
P1819 NISSAN Transfer Control Device
P1819 PONTIAC Internal Mode Switch
P1819 SATURN Internal Mode Switch
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