Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Is this a key-less start system?
If you normally start the engine without a key, then it's a key-less system. Otherwise it's the regular system.
This system doesn't have a traditional PRND switch. Instead, it uses a transmission internal mode switch that transmits logic signals to the BCM through the serial data bus. To test it, you'll need a scan tool capable of displaying IMS values.
OK. Then we can start our diagnosis:
First, plug in scan tool and turn ignition on. Select IMS on the scan tool. Move the lever to each transmission range: P, R,N, D4, D3, D2 and D1. Does each range selected match the scan tool IMS display? If not, what does it display?
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