reduced power mode - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jer64 · 06-28-2015, 01:28 AM

I just finished swapping an 06 L33 and 4L60E into my '64 and finally got to drive my truck, but when I hit the gas pedal, the truck goes into reduced power mode. It is fine when I have it in park or neutral, it idles perfect and rev's perfect, only when I am driving will the truck go into limp mode. The only codes I've gotten are P0650 and U0107. I replaced the throttle body, TPS and double checked all the wires and grounds. Figured the new throttle body and TPS would fix it, but doesn't seem to have an effect.

I recently changed tire sizes from 275/65/15 (which the computer was programmed to) to a 265/35/22 and haven't flashed the computer yet. Is it possible that the difference in OD in the tires is causing the problem? I was going to throw the old wheels and tires on to see, but they're in storage now and haven't been able to get them.....

any thoughts would be appreciated, thanks!

BR3W CITY · 06-28-2015, 03:14 AM

The U0107 is the code for reduced power, so its telling you something you already know. Its something you'll see from low voltage (so make sure your not just running of Alt power). Also make sure you don't have damaged or pinched wires on the throttle pedal and Tac module. Make sure the plugs on the TAC unit are fully insterted and clicked in.

The other code is the MIL control circuit. I'm not super familiar with that code, but I believe its the circuit that runs the idiot light, and also goes to the gauges and BCM. If your not running the o.e gauges and BCM stuff, this shouldn't be causing your problem.

chuckmc8 · 06-28-2015, 05:11 AM

What I do and suggest to others is you have LS wiring issues is to go over your harness with a "fine tooth comb"- in other words, disconnect and inspect every connection and:

check grounds

double check grounds

Its usually a ground issue on LS wiring complications IME

aknovaman · 06-28-2015, 08:55 AM

Are you certain you have the correct pedal for the file in the PCM?

**Hart_Rod** · 06-29-2015, 03:56 PM

Pedal and tach module have to match.

Shon · 07-01-2015, 07:28 PM

what's the 'cold air set up'? we had a GTO that would do this, after all the changes to the PCM/etc it would still do it. come to find out the blade was catching on the MAF/coupler, changed that up and all was fine! so look at that area.

aknovaman · 07-01-2015, 07:32 PM

Is the traction control input wire removed from the PCM? What ecu are you running, e40, e38 or p59?

Jer64 · 07-09-2015, 03:35 PM

Quote:

Originally Posted by aknovaman

Are you certain you have the correct pedal for the file in the PCM?

i asked this question to the company who did my tune and it sounds like they had an 03 to 05 tune on the PCM which is different than the 06 with the plastic pedal. i sent my PCM back to them to have it re-tuned.

Quote:

Originally Posted by aknovaman

Is the traction control input wire removed from the PCM? What ecu are you running, e40, e38 or p59?

i just sent another e-mail asking these two questions.

thank you for the input!

Jer64 · 07-09-2015, 03:37 PM

Quote:

Originally Posted by Shon

what's the 'cold air set up'? we had a GTO that would do this, after all the changes to the PCM/etc it would still do it. come to find out the blade was catching on the MAF/coupler, changed that up and all was fine! so look at that area.

i put a Spectre cold air kit on it. are you referring to the blade on the throttle body?

Jer64 · 07-09-2015, 03:43 PM

Quote:

Originally Posted by BR3W CITY

The U0107 is the code for reduced power, so its telling you something you already know. Its something you'll see from low voltage (so make sure your not just running of Alt power). Also make sure you don't have damaged or pinched wires on the throttle pedal and Tac module. Make sure the plugs on the TAC unit are fully insterted and clicked in.

The other code is the MIL control circuit. I'm not super familiar with that code, but I believe its the circuit that runs the idiot light, and also goes to the gauges and BCM. If your not running the o.e gauges and BCM stuff, this shouldn't be causing your problem.

i went through my wiring again and found that i had the wiring for the TCC brake switch mixed up, so i swapped it and it cleared the MIL code!

Jer64 · 07-13-2015, 10:31 PM

I received and installed the re-tuned PCM from the vendor today and the problem is fixed! They had the wrong pedal on file like was suggested. I just want to thank everyone for responding and helping me get this figured out!

BR3W CITY · 07-14-2015, 12:28 AM

06-28-2015, 01:28 AM	#1
Jer64 Registered User Join Date: Feb 2013 Location: Mill Creek Washington Posts: 127	reduced power mode I just finished swapping an 06 L33 and 4L60E into my '64 and finally got to drive my truck, but when I hit the gas pedal, the truck goes into reduced power mode. It is fine when I have it in park or neutral, it idles perfect and rev's perfect, only when I am driving will the truck go into limp mode. The only codes I've gotten are P0650 and U0107. I replaced the throttle body, TPS and double checked all the wires and grounds. Figured the new throttle body and TPS would fix it, but doesn't seem to have an effect. I recently changed tire sizes from 275/65/15 (which the computer was programmed to) to a 265/35/22 and haven't flashed the computer yet. Is it possible that the difference in OD in the tires is causing the problem? I was going to throw the old wheels and tires on to see, but they're in storage now and haven't been able to get them..... any thoughts would be appreciated, thanks! __________________ My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=587028

06-28-2015, 03:14 AM	#2
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: reduced power mode The U0107 is the code for reduced power, so its telling you something you already know. Its something you'll see from low voltage (so make sure your not just running of Alt power). Also make sure you don't have damaged or pinched wires on the throttle pedal and Tac module. Make sure the plugs on the TAC unit are fully insterted and clicked in. The other code is the MIL control circuit. I'm not super familiar with that code, but I believe its the circuit that runs the idiot light, and also goes to the gauges and BCM. If your not running the o.e gauges and BCM stuff, this shouldn't be causing your problem. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

06-28-2015, 05:11 AM	#3
chuckmc8 It's alsways something..... Join Date: Nov 2008 Location: Douglasville GA Posts: 1,171	Re: reduced power mode What I do and suggest to others is you have LS wiring issues is to go over your harness with a "fine tooth comb"- in other words, disconnect and inspect every connection and: check grounds double check grounds Its usually a ground issue on LS wiring complications IME __________________ 1968 RS Camaro 'Vert Matching number 327 and M21 Muncie 1968 C10 Black with red interior and orig paint. 5.3 / 4l60e,3:73 POSI 17" Torq Thrusts 1968 CST 514 Red with black interior. Buddy Buckets, Factory A/C, PS, PB- 20" AR custom shop TT, 5.3 and 4l60e

06-28-2015, 08:55 AM	#4
aknovaman Registered User Join Date: Aug 2013 Location: Tecumseh Posts: 355	Re: reduced power mode Are you certain you have the correct pedal for the file in the PCM? __________________ Current project 1959 Willys = GEZR TRUK Geezer is a Latin compound word made up of two roots. Gee meaning Urine Stain and Zer meaning your pants are open! FMCDH GBU and GBA http://www.youtube.com/user/aknovaman/videos

06-29-2015, 03:56 PM	#5
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,858	Re: reduced power mode Pedal and tach module have to match. __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

07-01-2015, 07:28 PM	#6
Shon Registered User Join Date: Sep 2005 Location: sc Posts: 1,203	Re: reduced power mode what's the 'cold air set up'? we had a GTO that would do this, after all the changes to the PCM/etc it would still do it. come to find out the blade was catching on the MAF/coupler, changed that up and all was fine! so look at that area. __________________ 71 Cheyenne C10 LWB cam'd 6.0/T56 Swap

07-01-2015, 07:32 PM	#7
aknovaman Registered User Join Date: Aug 2013 Location: Tecumseh Posts: 355	Re: reduced power mode Is the traction control input wire removed from the PCM? What ecu are you running, e40, e38 or p59? __________________ Current project 1959 Willys = GEZR TRUK Geezer is a Latin compound word made up of two roots. Gee meaning Urine Stain and Zer meaning your pants are open! FMCDH GBU and GBA http://www.youtube.com/user/aknovaman/videos

07-13-2015, 10:31 PM	#11
Jer64 Registered User Join Date: Feb 2013 Location: Mill Creek Washington Posts: 127	Re: reduced power mode I received and installed the re-tuned PCM from the vendor today and the problem is fixed! They had the wrong pedal on file like was suggested. I just want to thank everyone for responding and helping me get this figured out! __________________ My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=587028

07-14-2015, 12:28 AM	#12
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: reduced power mode __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

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