2003 Chevy Tahoe Reduced Engine Power
#1
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Had engine replaced in my 2003 Chevy Tahoe 5.3 Flex. It runs perfect. But if i cut on my ac, hold window but down too long or hold door lock button too long i get message reduced engine power. I get error code P1518. (I have a brand new throttle body and a brand new throttle actuator It doesn’t have any trouble starting) I then gotta use my scanner to reset the code. Any suggestions? Thanks
Last edited by Truckman77; October 1st, 2021 at 12:30 PM.
#2
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Here's a start. Weak battery is a prime suspect, just because it cranks and starts doesn't mean it's good.
P1518 CHEVROLET code possible causes
- Dead or weak battery
- Faulty Throttle Actuator Control (TAC) module
- Throttle Actuator Control (TAC) module harness is open or shorted
- Throttle Actuator Control (TAC) module circuit poor electrical connection
- Check Throttle Actuator Control (TAC) module connector for water
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