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  1. #1
    New Member
    Join Date
    Nov 2007
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    florida
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    2
    Corvette(s)
    2001 white with blue flames

    Default reduced engine power

    I just had all the grounds and connectors checked and cleaned on my 2001 vette. I am still having trouble with the check engine light,service traction control and reduced engine power coming on when I'm stopped or driving. The latest codes to come up were P1221,P1515,C1278. I'm starting to pull my hair out over this problem. Anyone had this problem or can point me in the right direction. Thanks.

  2. #2
    Member jj2k's Avatar
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    Jun 2009
    Location
    Florida
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    43
    Corvette(s)
    2000 pewter conv

    Default

    Let me say up front, I'm not a mechanic. Take this for what it's worth. Have you checked your brake system? Here's why I ask. A couple of months ago I got the service traction control light and code as well. Right after that the brake light came on. About 10 minutes later the DIC displayed low brake fluid. I took it in to have it checked and was told the front brakes were shot, the rears were ok. So, new pads and rotors up front and the problem went away. Two months later the same thing happens: service traction control, low brake fluid light. Took it to a different mechanic and he found the master cyclinder needed to be replaced. He did say the brakes were fine all the way around.

    So, this could be related to your problem, or it could just be useless info. I hope you get your problem diagnosed and fixed quickly. The things can be quite persnickety sometimes.

  3. #3
    Technical Writer for Internet & Print Media
    Join Date
    Jan 2001
    Location
    Southern California
    Posts
    6,576
    Corvette(s)
    71 95 04 12

    Default

    Quote Originally Posted by vetteguy61 View Post
    I just had all the grounds and connectors checked and cleaned on my 2001 vette. I am still having trouble with the check engine light,service traction control and reduced engine power coming on when I'm stopped or driving. The latest codes to come up were P1221,P1515,C1278. I'm starting to pull my hair out over this problem. Anyone had this problem or can point me in the right direction. Thanks.
    Do you have the factory service manual for 2001?

    If you do, have you done the diagnostic procedures listed in the FSM for those fault codes?

    If you don't have the FSM, buy one. You'll end up with 1) more hair and 2) advice on how to troubleshoot and repair those problems.

    Zip Products sells factory service manuals.

  4. #4

    Join Date
    Sep 2002
    Location
    Edison,NJ
    Posts
    28
    Corvette(s)
    2000 Silver Convertible

    Default

    Check this thread that I posted in 2006." Electrical problems, Help "
    I found that there was water shorting the BCM. I cleaned it up and haven't had any problems since. Also make sure that you clean out the cowl drains, especially the one right behind the engine, its hard to get at, but if it is clogged, water will run over the BCM. you may not even notice it.

  5. #5
    Member Pac-man's Avatar
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    Oct 2003
    Location
    Barrington, R.I.
    Posts
    461
    Corvette(s)
    1999 triple black vert.

    Default

    Sounds like the problem that I had. It was the plug for the bundle off wires in the passenger door. Male female connector was bad and I had the same codes. Open the door and move the bundle around and you can figure it out.
    Pac-Man

  6. #6
    Member gmjunkie's Avatar
    Join Date
    Nov 2004
    Location
    Old Fort NC/Vero Beach FL
    Posts
    5,340
    Corvette(s)
    03 Z-51,78 L82 Coupe

    Default

    Quote Originally Posted by vetteguy61 View Post
    I just had all the grounds and connectors checked and cleaned on my 2001 vette. I am still having trouble with the check engine light,service traction control and reduced engine power coming on when I'm stopped or driving. The latest codes to come up were P1221,P1515,C1278. I'm starting to pull my hair out over this problem. Anyone had this problem or can point me in the right direction. Thanks.
    My guess is you have a faulty TPS (Throttle Position Sensor) the P1515 and C1278 are tripped in the aftermath!Bad News is the TPS isn't serviceable except with Throttle Body Replacement!!
    You should probly check for bad connections and broken wires first around the throttle body!My SI service program has 21 steps for diagnostic testing to sort it out!!

    DTC P1221

    Circuit Description

    The throttle position (TP) sensor is mounted on the throttle body assembly. The sensor is actually 2 individual TP sensors within 1 housing. Two separate signal, low reference and 5 volt reference circuits are used in order to connect the TP sensor assembly to the throttle actuator control (TAC) module. The 2 sensors have opposite functionality. The TP sensor 1 signal voltage is pulled up to the reference voltage as the throttle opens, from below 1 volt at closed throttle to above 3.5 volts at wide open throttle (WOT). The TP sensor 2 signal voltage is pulled down to the low reference from around 3.8 volts at closed throttle to below 1 volt at WOT. TP sensor 1 and APP sensor 1 share a 5-volt reference circuit that is connected within the TAC module. TP sensor 2 and APP sensor 2 share a 5-volt reference circuit that is connected within the TAC module. If an out of range condition is detected with the TP sensors, this DTC will set and the Reduced Engine Power message will be displayed.


    Hope this helps!~!
    junk!!
    "WARNING"
    The views and opinions of this forum user might not be suitable for others, this user may appear to be heavily over-medicated, under medicated, intoxicated, listening to the voices in his head or just plain being an ass, so some viewers may be offended!~!!!
    www.gmjunkie.com
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  7. #7
    Member
    Join Date
    Oct 2010
    Location
    Crossville, TN
    Posts
    16
    Corvette(s)
    2001 pewter Conv, 6 sp

    Default Body control module problem

    I had the same problem, car was under ext warr, the dealer replaced the BCM problem is gone, that happened 1 year ago. list price for a bcm is $1160.00 part number is 10304931 labor was $234.00 dealership I saw on this web site sells BCM for $700.00 plus. I paid $100.00.

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