1996 GM Gasser Codes

Victory Red · 11-15-2003, 03:36 PM

Ok I know one of you guys have access to this information. A friend of mine has a 1996 GMC Sierra 4x4 1/2ton 350ci motor.

He pulled the following codes

1406

1133

134

The million dollar question is does anyone know what these codes mean? He's got around 100k on it now and wants to get another 100 so he needs to know what needs tweaking.

Thanks in advance.

GMCSID · 11-15-2003, 03:55 PM

DTC P1406 EGR position sensor performance

DTC P1133 HO2S insufficient switching bank 1 sensor 1

DTC P0134 HO2S circuit insufficient activity bank 1 sensor 1

The EGR code could be affecting the O2 sensors. The EGR gets plugged with carbon and removing it and cleaning it usually fixes it.

Victory Red · 11-17-2003, 08:31 PM

GMCSID,

Nice to know there's another expert online with us.

Anyhow, thanks for the quick response.

11-15-2003, 03:36 PM	#1
Victory Red Diesel Master Join Date: Sep 2003 Location: Brookfield WI Posts: 1,461 Garage: active iTrader: (0)	Ok I know one of you guys have access to this information. A friend of mine has a 1996 GMC Sierra 4x4 1/2ton 350ci motor. He pulled the following codes 1406 1133 134 The million dollar question is does anyone know what these codes mean? He's got around 100k on it now and wants to get another 100 so he needs to know what needs tweaking. Thanks in advance. __________________ '10 Victory Cross Country 08 Chevrolet Impala(why does this thing need a rear spoiler???) 03 C/C SB 2500HD 87,000+ miles(sold 4/17/08) 03 Trailblazer 4200 I6 119,000 miles 05 Victory Kingpin 51,000 miles(sold 10/17/09) VR Stainless Straps, LLC victoryred @ att.net
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11-15-2003, 03:55 PM	#2
GMCSID Diesel Fanatic Join Date: Oct 2003 Location: Livermore,CA Posts: 1,220 Garage: active iTrader: (0)	DTC P1406 EGR position sensor performance DTC P1133 HO2S insufficient switching bank 1 sensor 1 DTC P0134 HO2S circuit insufficient activity bank 1 sensor 1 The EGR code could be affecting the O2 sensors. The EGR gets plugged with carbon and removing it and cleaning it usually fixes it.
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11-17-2003, 08:31 PM	#3
Victory Red Diesel Master Join Date: Sep 2003 Location: Brookfield WI Posts: 1,461 Garage: active iTrader: (0)	GMCSID, Nice to know there's another expert online with us. Anyhow, thanks for the quick response. __________________ '10 Victory Cross Country 08 Chevrolet Impala(why does this thing need a rear spoiler???) 03 C/C SB 2500HD 87,000+ miles(sold 4/17/08) 03 Trailblazer 4200 I6 119,000 miles 05 Victory Kingpin 51,000 miles(sold 10/17/09) VR Stainless Straps, LLC victoryred @ att.net
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