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#4609529 - 12/20/17 05:58 PM GM block heater therostat bypass
BigJakeChevy Offline

Registered: 07/26/15
Posts: 126
Loc: Alberta
Does anyone have experience cutting the thermostat end off their block heater cord? Will it cause any check engine light? Any other issues that could happen here? Info online is inconsistent. Thanks!
2007 Silverado Classic 5.3L PPPP 10w30 455,000kms

#4609558 - 12/20/17 06:31 PM Re: GM block heater therostat bypass [Re: BigJakeChevy]
WobblyElvis Online   content

Registered: 09/23/14
Posts: 1391
Loc: Toronto Canada
I can't see this causing any problems. I don't understand why they would make it so the heater does not come on when the temp is above 0 degrees F. I would cut off the end and replace it.

#4609563 - 12/20/17 06:35 PM Re: GM block heater therostat bypass [Re: BigJakeChevy]
carviewsonic Offline

Registered: 08/17/16
Posts: 226
Loc: Alberta
Could set p0116 code if difference between coolant temp and intake air (ambient) temp is 30 deg C or more. If you use a timer so block heater is on for no more than 2-3 hrs that wouldn't be a problem. If you leave it plugged in all night it could set the code. The ECM assumes the engine temp sensor is faulty, and sets fuel map for 80 deg C. Also runs cooling fans (if your truck has electric cooling fans). Happened on my 2005 Buick, I erased the p0116 code with a code reader, and am now more careful not to plug in more than necessary.
'18 Impala new
'03 Park Avenue 300k kms
'05 Park Avenue 28k kms
'07 Honda Accord 21k kms
'09 VStar 1300 6k kms

#4609819 - 12/21/17 01:16 AM Re: GM block heater therostat bypass [Re: BigJakeChevy]
BigJakeChevy Offline

Registered: 07/26/15
Posts: 126
Loc: Alberta
Thank you for the info.
2007 Silverado Classic 5.3L PPPP 10w30 455,000kms