Help; Engine power is reduced

[Madmax1]

Check engine light on, use the scanner receive code P0223 and P0122 I replaced throttle body (brand new), after test driving for 20 min, vehicles shutdown with engine power is reduced message. I use the relearn process and nothing happen. I put back the old one and still doing the same thing as the new one, so reinstall the new one back and continue with the relearn process and still nothing. Need some guidance and advice; somebody point me in the right direction please.

2010 Camaro ss (L99 conversion to LS3) GPI Stage 3, headers, intake, exhaust. tune.

[KillboyPowerhead]

When did the issue start? How long after the engine conversion/latest intake mods/tune? Any other mods (i.e. throttle controller)?

https://www.chevytalk.org/fusionbb/s...hp?tid/295283/ this guy had both codes too and ended up replacing the throttle pedal unit.

[NOT A 45]

Originally Posted by Madmax1

Check engine light on, use the scanner receive code P0223 and P0122 I replaced throttle body (brand new), after test driving for 20 min, vehicles shutdown with engine power is reduced message. I use the relearn process and nothing happen. I put back the old one and still doing the same thing as the new one, so reinstall the new one back and continue with the relearn process and still nothing. Need some guidance and advice; somebody point me in the right direction please.

2010 Camaro ss (L99 conversion to LS3) GPI Stage 3, headers, intake, exhaust. tune.

Give this a try

Circuit/System Testing
Ignition OFF, disconnect the harness connector at the Q38 throttle body.
Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the low reference circuit terminal C and ground.
If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
Ignition ON, test for 4.8–5.2 V between the 5 V reference circuit terminal E and ground.
If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
Test for less than 1 V between the TP sensor 1 signal circuit terminal D and ground.
If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
Install a 3 A fused jumper wire between TP sensor 1 signal circuit terminal D and the 5-volt reference circuit terminal E. Verify the scan tool TP sensor 1 voltage parameter is greater than 4.8 V.
If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
Test for 4.8–5.2 V between the TP sensor 2 signal circuit terminal F and ground.
If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
If all circuits and connections test normal, replace the Q38 throttle body assembly.

[SSEssence]

Did you undo the battery positive terminal to reset after the reduced power warning?

[Madmax1]

@KillboyPowerhead, The issues start 20 min after I replaced the throttle body, I have been driving the car for the last year and a half after the conversion without any issues, I replaced the accelerator pedal sensor too and still doing the same. Thank you for the info.

[NOT A 45]

Originally Posted by Madmax1

The issues start 20 min after I replaced the throttle body, I have been driving the car for the last year and a half after the conversion without any issues, I replaced the accelerator pedal sensor too and still doing the same. Thank you for the info.

Maybe I'm misunderstanding. After you replaced the throttle body, did the codes go away? Also, the app has nothing to do with the codes that were set. If it's giving you a reduced power message and no codes are being set, I'd be suspecting a ecm problem. System is simple, throttle body-6wires-ecm. We know it's not the Throttle body, so if the wiring checks out the only thing left is the ecm. Another thing that leads me to believe it's the ecm is that it runs fine for 20 min. The diagnostic I sent you is out of the service manual for both codes. Hope this helps.

[Camaro_Fuzion]

Perhaps clean the mass airflow sensor.

[Miami_SS]

Originally Posted by Madmax1

Check engine light on, use the scanner receive code P0223 and P0122 I replaced throttle body (brand new), after test driving for 20 min, vehicles shutdown with engine power is reduced message. I use the relearn process and nothing happen. I put back the old one and still doing the same thing as the new one, so reinstall the new one back and continue with the relearn process and still nothing. Need some guidance and advice; somebody point me in the right direction please.

2010 Camaro ss (L99 conversion to LS3) GPI Stage 3, headers, intake, exhaust. tune.

My 2011 Camaro SS LS3 had the same issue. Similar codes and my Camaro went into "limp mode" unexpectedly like on a highway which is DANGEROUS. I replaced the gas pedal and it all went away. There are MANY posts in this forum highlighting the exact issue that you are having.

Try replacing the gas pedal, it costs $70 and is MUCH CHEAPER than replacing a throttle body. You can replace the gas pedal yourself, it's 3 (10 mm) screws. The hardest part is twisting your body under the dash to remove and replace the pedal.

[NOT A 45]

Originally Posted by Miami_SS

My 2011 Camaro SS LS3 had the same issue. Similar codes and my Camaro went into "limp mode" unexpectedly like on a highway which is DANGEROUS. I replaced the gas pedal and it all went away. There are MANY posts in this forum highlighting the exact issue that you are having.

Try replacing the gas pedal, it costs $70 and is MUCH CHEAPER than replacing a throttle body. You can replace the gas pedal yourself, it's 3 (10 mm) screws. The hardest part is twisting your body under the dash to remove and replace the pedal.

He has already replaced the accelerator pedal. Similar codes aren't the same codes! P0223 and P0122 refer to the circuit between the ecm and throttle body. Not the circuit between the pedal and ecm. Smh

[HyperV117]

I would double check the connector for the throttle body. If the issue started after the swap and it's still doing when you reverted back there might be something wrong with the connector.

[jesse121pm]

Check the battery, I know it sounds stupid but same thing happened on my camaro. It put every light on the dash and reduced power. Rpm's didnt work on the dash and it was the battery. These cars do funny things when the batteries are running low.

[HDRDTD]

Check all the connecter pins to make sure all the pins are seated properly .

[Madmax1]

throttle codes are gone, just the random misfiring code still showing up. only thing I didnt replaced is the battery. Thank you everyone for the input.