P18BF CHEVROLET - Internal Mode Switch 'A' Circuit Stuck On Invalid Voltage Range
- 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)
P18bf Chevrolet DescriptionThe internal mode switch indicates to the Transmission Control Module (TCM) which gear position the vehicle operator has selected. The internal mode switch consists of 5 separate hall effect switches. Each hall effect switch is supplied a 9 V reference circuit and a signal circuit from the TCM. Each signal circuit for each gear selector position will have either a voltage reading of 0.70-0.96 V indicting On or 1.68-2.38 V indicating Off. The voltage values on each internal mode switch circuit will change and are dependent on the position of the gear selector. The state of each internal mode switch A/B/C/P/S signal circuit is displayed on the scan tool.
Need more help?Get the P18bf Chevrolet code diagnosed by a professional: Find a repair shop in your area
P18BF CHEVROLET 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 P18bf Chevrolet code? Have you replaced any parts?
Any information is appreciated. Thanks