C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

Help!

Thread Tools
 
Search this Thread
 
Old Sep 2, 2019 | 05:19 PM
  #1  
Slash1151's Avatar
Slash1151
Thread Starter
7th Gear
 
Joined: Sep 2019
Posts: 7
Likes: 0
Default Help!

I recently found a few codes on my car. I hope someone can give me a few ideas to resolve them. Here are the codes

u1000h
u1064h
p1518hc
po650hc

the car has a service engine light on and has said reduced power, low voltage, and charging system failure. I tested the battery and it’s showing 12 volts. The alternator test good as well. Any tips or Advice are greatly appreciated.
Reply
Old Sep 2, 2019 | 06:05 PM
  #2  
JR-01's Avatar
JR-01
Le Mans Master
 
Joined: Sep 2013
Posts: 8,900
Likes: 1,074
From: Wisconsin
Default

12 volts is only 25% charge. Should be 12.6 volts. Sounds like a weak battery. Sort that out first.
Reply
Old Sep 3, 2019 | 01:53 AM
  #3  
laurent_zo6's Avatar
laurent_zo6
Melting Slicks
10 Year Member
 
Joined: Aug 2013
Posts: 2,491
Likes: 315
St. Jude Donor '15-'16-'17-'18-'19-'20-'21-'22
Default

Originally Posted by Slash1151
I recently found a few codes on my car. I hope someone can give me a few ideas to resolve them. Here are the codes

u1000h
u1064h
p1518hc
po650hc

the car has a service engine light on and has said reduced power, low voltage, and charging system failure. I tested the battery and it’s showing 12 volts. The alternator test good as well. Any tips or Advice are greatly appreciated.
As mentioned by JR 12v is too low. You should have it first load tested at an auto part store.

Always mention the car year and whether manual or auto when posting here.

Code with an h at the end means history. There is/was a problem at one time. You should delete code. If it returns, then there is an issue.

U1000h - U1000 Loss of Communication Undetermined
u1064h - Loss of Communication with BCM
p1518hc - PCM to TAC Module Serial Data Circuit
po650hc - MIL Control Circuit

Here is a list of DTC codes:
Attached Images
File Type: pdf
C5 DTC Codes.pdf (89.2 KB, 102 views)
Reply
Old Sep 3, 2019 | 04:38 AM
  #4  
Vetteman Jack's Avatar
Vetteman Jack
Administrator
Supporting Lifetime
Veteran: Navy
St. Jude 20 Year Donor
25 Year Member
Veteran: Reserves
 
Joined: Mar 2001
Posts: 367,947
Likes: 24,704
From: In a parallel universe. Currently own 2014 Stingray Coupe.
C7 of the Year - Modified Finalist 2021
MO Events Coordinator
St. Jude Co-Organizer
St. Jude Donor '03 thru '25
NCM Sinkhole Donor
CI 5, 8 & 11 Veteran
Default

Moved to C5 Tech.
Reply

Get notified of new replies

To Help!





All times are GMT -4. The time now is 03:03 PM.

story-0
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-1
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-2
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-3
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-4
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-5
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-6
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-7
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-8
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-9
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE