Looking for ECM trouble codes list.. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*mike reeh* · 08-31-2003, 10:13 PM

my 91 burb is showing a code 85 and its not in the manual. Anyone got a list or know what code 85 is?

mike

**68 Stepside** · 08-31-2003, 11:54 PM

Uhm....I can't find a code 85 either...but here's a site with a ton of codes, always handy to have it bookmarked anyways.

http://www.troublecodes.net/GM/

**68 Stepside** · 08-31-2003, 11:55 PM

Actually, what engine is that?

Here's a 91 4.9L 85 code: 85 The coast down throttle angle offset is more than 5 degrees from the zero value.

**68 Stepside** · 08-31-2003, 11:56 PM

this may be related too, a "generic" code 85 on a GM is an undefined gear ratio

*mike reeh* · 09-01-2003, 01:22 AM

68 stepside thanks for the link. the engine is a 454. im thinking it was probably a code related to the knock sensor.. the P.O. told me that the harness by the starter would fall off sometimes and the check engine lite would come on. There was two codes, 14 which was coolant temp which i already fixed, and 85.. i cleared em and so far so good. Still strange though.

mike

Cole's 87 · 09-01-2003, 12:29 PM

This is what a code book for the OBD1 computer says

Code 85
Electroic control module computer circuit - faulty programmable read-only memory (PROM)

or
Transmission input or output speed sensor - circuit problems (speed sensor does not agree with selected gear range)

or
Torque converter clutch (TCC) TCC is mechaniclly stuck on

This is exactly how it reads in the book hope this help out.

08-31-2003, 10:13 PM	#1
mike reeh 5 day ban, learn to behave. Join Date: Nov 2002 Location: san diego, ca Posts: 683	Looking for ECM trouble codes list.. my 91 burb is showing a code 85 and its not in the manual. Anyone got a list or know what code 85 is? mike

08-31-2003, 11:54 PM	#2
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,690	Uhm....I can't find a code 85 either...but here's a site with a ton of codes, always handy to have it bookmarked anyways. http://www.troublecodes.net/GM/ __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

08-31-2003, 11:55 PM	#3
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,690	Actually, what engine is that? Here's a 91 4.9L 85 code: 85 The coast down throttle angle offset is more than 5 degrees from the zero value. __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

08-31-2003, 11:56 PM	#4
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,690	this may be related too, a "generic" code 85 on a GM is an undefined gear ratio __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

09-01-2003, 01:22 AM	#5
mike reeh 5 day ban, learn to behave. Join Date: Nov 2002 Location: san diego, ca Posts: 683	68 stepside thanks for the link. the engine is a 454. im thinking it was probably a code related to the knock sensor.. the P.O. told me that the harness by the starter would fall off sometimes and the check engine lite would come on. There was two codes, 14 which was coolant temp which i already fixed, and 85.. i cleared em and so far so good. Still strange though. mike

09-01-2003, 12:29 PM	#6
Cole's 87 Registered User Join Date: Nov 2002 Posts: 272	This is what a code book for the OBD1 computer says Code 85 Electroic control module computer circuit - faulty programmable read-only memory (PROM) or Transmission input or output speed sensor - circuit problems (speed sensor does not agree with selected gear range) or Torque converter clutch (TCC) TCC is mechaniclly stuck on This is exactly how it reads in the book hope this help out.



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