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Replaced 1999 ecm with a 02 ecm.( Flashed to my car )
picked car up from shop.. gas gauge only shows half tank after filling it up. Air bag light is on.and oil pressure gauge is on ZERO.( has good oil pressure. Checked with hp tuners before leaving shop)
shop says they think a bad ecm. Everything worked fine taking it to shop for ECM install.
can a gm service tech find the problem?
thanks
Do you have access to a Tech 2 tool. The stealership will probably charge almost as much as a new knock-off tech 2 for the troubleshooting the issue. They will probably try to sell you a new PCM regardless which will be expensive.
I guess you could try disconnecting and re-connecting the battery or erasing the codes for starters if you haven't already.