Reduced engine power

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Jun 26, 2023 | 11:57 PM

cbreeze421

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2nd Gear

Joined: Aug 2019

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Reduced engine power

2002 Z06 Dead battery after recharging battery got the reduced engine power, check engine light , TCS, and ABS. Ran codes got 1125 HC, 2125 HC,2130 HC / 1233 H, 1278 H, / 067 HC,0363 HC any help on this would be greatly apreciated. Battery now fully charged tried resetting codes unable to clear any of the above . did disconnect battery and shorted .

Jun 27, 2023 | 03:53 AM

cbreeze421

Thread Starter

2nd Gear

Joined: Aug 2019

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reduced engine power

Update I did read through thread and will check grounds next then update thanks for looking guys

Jun 27, 2023 | 09:31 AM

jim993

Drifting

Joined: Sep 2009

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From: Prescott, Arizona

A failing ignition switch can also cause these symptoms. Hard to diagnose but clues to a failing switch include normal running after a shut down and restart (until the switch failure progresses), low voltage warning, TCS, Reduced Power and numerous others.

My 2001 is on its 3rd ignition switch.

Dec 9, 2023 | 04:18 AM

Pete Z06

Cruising

Joined: Dec 2023

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Quote:

Originally Posted by jim993

Also have an 01 that just starting freaking out and gave all the codes reduced power/low voltage/traction/handling. Gave the P1518 H C code only for the pcm. Haven't tested anything yet, but battery voltage is fine. But the needles bounce all around when turning the ignition and once the fuel pump didn’t come on. But after turning off ignition and back on no codes or reduced power but still engine light and it would start up ok. After you have replaced 3 is that for sure an ignition switch in your experience or do I have to deal with checking grounds the tps sensor the TAC module certain fuses or other things related to this issue? Or does it sound like the ignition switch to you? Thanks

Dec 9, 2023 | 09:06 AM

jim993

Drifting

Joined: Sep 2009

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From: Prescott, Arizona

The shut down and then a restart with only a check engine light does sound like the ignition switch. My second ignition switch did that once.

When you say no codes, no codes using C5 code check procedure? The 1518H is no longer present?

Dec 9, 2023 | 05:00 PM

Pete Z06

Cruising

Joined: Dec 2023

Posts: 13

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Quote:

Originally Posted by jim993

sorry I didn’t mean the literal codes i meant the display warnings like low voltage/ac and tc disabled/charge system fault etc. The check engine light actually went away on its own on a long canyon drive this morning, but obviously all comes back when I turn the car off and try to turn it back on again. Going to tear away to get to the switch right now and fingers crossed it just needs a little sanding

Dec 9, 2023 | 05:49 PM

jim993

Drifting

Joined: Sep 2009

Posts: 1,862

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From: Prescott, Arizona

Check Bill Curlee's post on rebuilding the ignition switch. An important part is to increases spring tension on the contact springs by bending so that they press firmly on the opposing contact:

https://www.corvetteforum.com/forums...ch-repair.html

Dec 9, 2023 | 10:04 PM

Pete Z06

Cruising

Joined: Dec 2023

Posts: 13

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Quote:

Originally Posted by jim993

oh man, I already put it back together and it worked! So stoked about it. But worse case scenario it’s really easy to access if anything happens again