Reduced engine power 2 codes

**davidadams** · 01-22-2014

On my way to work today all of the sudden on my 2004 Pontiac grand prix I get reduced engine check tcs the car will idle but I press the gas nothing just revs a little and bogs down at like 1500 rpm's threw codes p1518 - throttle actuator control module and p0102- mass air flow or map so not sure I have recently cleaned the tb and mass air sensor checked and cleaned ground wires not sure where do go from here any help is greatly appreciated

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**l67ss** · 01-22-2014

Either the motor in the tb or the gas peddle is bad

**davidadams** · 01-22-2014

Maybe I'll get lucky and it will be the peddle its cheaper than the tb

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**dsmuts** · 01-22-2014

Make sure you don't have a vacuum leak at the tb.

**davidadams** · 01-22-2014

I wish I did I checked all my vacuum lines but thanks to both of you

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**dsmuts** · 01-22-2014

Try unplugging the maf and start it.

**davidadams** · 01-22-2014

Did that too doesn't act any different

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**dsmuts** · 01-22-2014

Have you tried just clearing the codes and see if they come back?

**davidadams** · 01-22-2014

Clearing them by unplugging the battery?

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**dsmuts** · 01-22-2014

or with a scan tool

**davidadams** · 01-22-2014

Don't have a scan but I tried disconnecting the battery for a few minutes and that didn't work so its been sitting for like an hour. Or so now gonna go back out and see what happens

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**Scottydoggs** · 01-22-2014

it usually takes a good 30 minutes to clear a code by unhooking the battery.

**davidadams** · 01-22-2014

Thanks that's good to know

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**dsmuts** · 01-22-2014

it helps to touch the disconnected cables together to get rid of residual power.

**davidadams** · 01-22-2014

So I've reset the system had the battery unplugged over an hour to clear the codes of it did clear them they came right back so I'm hoping the pedal sensor is the problem but won't know for awhile just gonna go back to driving my 02 bonnie ssei for now

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**davidadams** · 01-22-2014

Thanks for everybody's input and help it is greatly appreciated

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**dsmuts** · 01-22-2014

Could very well be the pedal assembly then

**davidadams** · 02-15-2014

Well put in a new/used but good pedal sensor and same issue so does that mean I need a new throttle body?

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**Scottydoggs** · 02-15-2014

http://engine-codes.com/p1518_buick.html

Possible causes
- Dead or weak battery
- Faulty Throttle Actuator Control (TAC) module
- Throttle Actuator Control (TAC) module harness is ope or shorted
- Throttle Actuator Control (TAC) module circuit poor electrical connection
- Check Throttle Actuator Control (TAC) module connector for water
this part is on the TB check the wires to it, they bake in the exhaust heat.

Read more: http://engine-codes.com/p1518_buick.html#ixzz2tQjtqDND