- Faulty Immobilizer ECU
- Immobilizer ECU harness is open or shorted
- Immobilizer ECU circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1803 DescriptionImmobilizer ECU Signal Error is the generic description for the P1803 code, but the manufacturer may have a different description. Currently we have no further information abouth the P1803 OBDII code. Please post your question on our "Questions" section for more information: AutoCodes.com Questions.
P1803 Information for specific makes
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P1803 CommentsHelp us improve AutoCodes.com. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P1803 code? Have you replaced any parts?
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