Possible causes
– Faulty Transfer Neutral Position Switch
– Transfer Neutral Position Switch harness is open or shorted
– Transfer Neutral Position Switch circuit poor electrical connection
– Transfer Neutral Position Switch harness is open or shorted
– Transfer Neutral Position Switch circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0818 TOYOTA Description
The Engine Control Module (ECM) detects the signal from the transfer neutral position switch. The P0818 code indicates that the transfer neutral position switch remains ON.