GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 3 of 3
  1. #1

    Default Obd i - trouble code 15

    I drive a 95 Chevy Tahoe. Last weekend I replaced the radiator, upper and lower hoses, thermostat and coolant temp sensor. Before I decided to do all of this the tahoe had been giving me a troublecode when I would start the truck for the first time of the day, usually when it had sat overnight. Once the truck was warm the check engine light would go away. I pulled the code using a jumper wire and it was code 15 (Engine Coolant Temp. Sensor Error (Low temp indicated).
    The problem I am having now after replacing the coolant sensor and the other things I listed above is my check engine light wont turn off now. I've disconnected the battery to reset all codes and as soon as I start the truck there it is again. Troublecode 15 affects the entire fuel injection system and my truck isn't running up to par. What do I need to do to get this issue fixed? I would appreciate any guidance or input on my situation. Thank You

  2. #2


    I would check to make sure the new sensor is good. Just because it is new doesn't mean it is working correctly. Than check to ensure the wire connections are tight. I knocked the wire end off of a coolant sensor on 02 ZR2 and the engine was running rich ( I think it has been a few years)

    2011 GMC Sierra SLE - 5.3 - 4X4 - Z71 - King Shock Level Kit - Body Color GMC grill emblem - 2 Tone Engine Cover, Rad Cover and Battery Box - Volant CAI - Tru Cool 40K tranny cooler - Sylvania ZXE bulbs Hi/Low -TriFold Hard Tonneau Cover- CoverCraft Seat Covers - Diablo inTune - GoRecon LED under rail lights - GoRecon LED White Lightning Tailgate Light Bar - Windows tinted to 45%- Kenwood DNX6990 - JL Audio C5-650 &650X- JL Audio Amp- Interco Truxus M/T 33x12.50x18

  3. #3
    Master Mechanic SupplySgt's Avatar
    Join Date
    Feb 2010
    Middle TN, displaced Okie


    He's right. You can get a bad part. Stuff happens sometimes. I would make sure the connection is solid first though. Check your wiring. It's a PITA but it's necessary.
    93 Suburban (Southern Slayer): TBI 350, 4L60E
    73 Z28 Camaro: L82, TKO 600


    "...Death smiles at us all, all a man can do is smile back..."

Similar Threads

  1. What is trouble code 36
    By rnash864 in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 2
    Last: 02-19-2013, 04:39 PM
  2. trouble code 171
    By snascar29 in forum Chevy Colorado Forum (GMC Canyon)
    Replies: 1
    Last: 12-10-2009, 06:38 PM
  3. trouble code
    By challutz in forum Chevy C/K Truck Forum
    Replies: 2
    Last: 11-21-2009, 07:37 AM
  4. Trouble code
    By T1743 in forum GM Diesel & DuraMax
    Replies: 1
    Last: 11-21-2009, 02:11 AM
  5. PO131 trouble code
    By johna20376 in forum Performance & Fuel
    Replies: 2
    Last: 05-26-2009, 12:50 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts