SES Question: Code 29 eas electrical fault
Thread Starter
Registered User
Joined: Mar 2005
Posts: 11
From: Ft. Wayne, Indiana
SES Question: Code 29 eas electrical fault
Hey Guys,
I am getting a pesky SES light in my '95 TA. When I hooked up my laptop and scanned the codes it came up with Code 29 eas electrical fault (odm). I cleared the codes and went for another drive and the code popped back again. My car runs fine and there are no real symptoms of a major problem. However all I just want to do is stop possible future damage. When the light comes on it sounds like a fan in the engine starts up. What could be causing this and can I fix it? I couldn't find anything using the search button. Your help is much appreciated
Thanks
9TA5
I am getting a pesky SES light in my '95 TA. When I hooked up my laptop and scanned the codes it came up with Code 29 eas electrical fault (odm). I cleared the codes and went for another drive and the code popped back again. My car runs fine and there are no real symptoms of a major problem. However all I just want to do is stop possible future damage. When the light comes on it sounds like a fan in the engine starts up. What could be causing this and can I fix it? I couldn't find anything using the search button. Your help is much appreciated
Thanks
9TA5
Registered User
Joined: Dec 2001
Posts: 726
From: Glendale, AZ
I believe that is the code for the air pump. 95s had a recall on them for being faulty.
Product Emission - Air Injection Reactor
(A.I.R.) Pump System Failures # 99083
99083 -- Air Injection Reactor (A.I.R.) Pump System Failures
1995, 1996, 1997 Chevrolet Camaro and Pontiac Firebird Model Vehicles
Equipped with 5.7L Engine (RPO LT1-VIN Code P)
Condition
General Motors has decided to conduct a Voluntary Emission Campaign involving all 1995, 1996 and 1997 Chevrolet Camaro and Pontiac Firebird model vehicles equipped with 5.7L (RPO LT1-VIN Code P) engines. The Air Injection Reactor (A.I.R.) pump emission control system on these vehicles may fail to operate and cause the Malfunction Indicator Lamp (MIL) to illuminate. This condition may be due to corrosion of a solenoid internal to the A.I.R. pump.
Correction
Dealers are to install a new A.I.R. pump assembly kit that is designed to protect the A.I.R. pump system from failing due to internal corrosion.
Vehicles Involved
Involved are all 1995, 1996 and 1997 Chevrolet Camaro and Pontiac Firebird model vehicles equipped with 5.7L (RPO LT1-VIN Code P) engines and built within the breakpoints shown.
Important Dealers should confirm vehicle eligibility through GMVIS (GM Vehicle Inquiry System) or GM Access Screen (Canada Only) or DCS Screen 445 (IPC only) prior to beginning campaign repairs. [Not all vehicles within the above breakpoints may be involved].
Involved vehicles have been identified by Vehicle Identification Number. Computer listings containing the complete Vehicle Identification Number, customer name and address data have been prepared, and are being furnished to involved dealers with the campaign bulletin. The customer name and address data furnished will enable dealers to follow-up with customers involved in this campaign. Any dealer not receiving a computer listing with the campaign bulletin has no involved vehicles currently assigned.
These dealer listings may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this listing to the follow-up necessary to complete this campaign.
Parts Information
Parts required to complete this campaign are to be obtained from General Motors Service Parts Operations (GMSPO). Please refer to your "involved vehicles listing" prior to ordering requirements. Normal orders should be placed on a DRO = Daily Replenishment Order. An emergency requirement should be ordered on a CSO - Customer Special Order.
Important Owner letters will be mailed in phases by model year in order to reduce initial pump kit demand. 1996 owner letters will be mailed one week after publication of the bulletin. 1997 and 1995 owner letters will be mailed as part kits become available. Please order accordingly.
(A.I.R.) Pump System Failures # 99083
99083 -- Air Injection Reactor (A.I.R.) Pump System Failures
1995, 1996, 1997 Chevrolet Camaro and Pontiac Firebird Model Vehicles
Equipped with 5.7L Engine (RPO LT1-VIN Code P)
Condition
General Motors has decided to conduct a Voluntary Emission Campaign involving all 1995, 1996 and 1997 Chevrolet Camaro and Pontiac Firebird model vehicles equipped with 5.7L (RPO LT1-VIN Code P) engines. The Air Injection Reactor (A.I.R.) pump emission control system on these vehicles may fail to operate and cause the Malfunction Indicator Lamp (MIL) to illuminate. This condition may be due to corrosion of a solenoid internal to the A.I.R. pump.
Correction
Dealers are to install a new A.I.R. pump assembly kit that is designed to protect the A.I.R. pump system from failing due to internal corrosion.
Vehicles Involved
Involved are all 1995, 1996 and 1997 Chevrolet Camaro and Pontiac Firebird model vehicles equipped with 5.7L (RPO LT1-VIN Code P) engines and built within the breakpoints shown.
Important Dealers should confirm vehicle eligibility through GMVIS (GM Vehicle Inquiry System) or GM Access Screen (Canada Only) or DCS Screen 445 (IPC only) prior to beginning campaign repairs. [Not all vehicles within the above breakpoints may be involved].
Involved vehicles have been identified by Vehicle Identification Number. Computer listings containing the complete Vehicle Identification Number, customer name and address data have been prepared, and are being furnished to involved dealers with the campaign bulletin. The customer name and address data furnished will enable dealers to follow-up with customers involved in this campaign. Any dealer not receiving a computer listing with the campaign bulletin has no involved vehicles currently assigned.
These dealer listings may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this listing to the follow-up necessary to complete this campaign.
Parts Information
Parts required to complete this campaign are to be obtained from General Motors Service Parts Operations (GMSPO). Please refer to your "involved vehicles listing" prior to ordering requirements. Normal orders should be placed on a DRO = Daily Replenishment Order. An emergency requirement should be ordered on a CSO - Customer Special Order.
Important Owner letters will be mailed in phases by model year in order to reduce initial pump kit demand. 1996 owner letters will be mailed one week after publication of the bulletin. 1997 and 1995 owner letters will be mailed as part kits become available. Please order accordingly.
Registered User
Joined: Nov 2005
Posts: 146
If you have no visual or sniff tests to contend with, remove the AIR pump and it's components and then seal the bungs in the manifolds or header. Then, the only thing to worry about is having the code removed from your computer.
Thread Starter
Registered User
Joined: Mar 2005
Posts: 11
From: Ft. Wayne, Indiana
What would lead you guys to think it is the AIR pump?
We don't have any emissions testing in Indiana that I am aware of, so removing it won't be a problem. Thanks for the input it is really appreciated.
We don't have any emissions testing in Indiana that I am aware of, so removing it won't be a problem. Thanks for the input it is really appreciated.
Administrator
Joined: Nov 1998
Posts: 71,098
From: Hell was full so they sent me to NJ
Best place to check for the meaning of codes on an LT1 is on Shoebox's website. The list is LT1-specific, not the generic lists that can give you confusing info.
http://shbox.com/1/Dtcs.htm
If you looked it up there, you would have found this:
DTC 29 = Secondary Air Injection (AIR) pump circuit
....which explains why everyone has told you its the AIR pump. In the 93-95 OBD-I cars, the PCM only checks the electrical circuit to the pump relay, and if the circuit is "open" it sets the code. Check the fuse for the AIR pump. If you replace it, and it continues to blow, the pump may be siezed up from rust. If you simply unplug the harness connector from the AIR pump, and then replace the fuse, you will not get a DTC code.
http://shbox.com/1/Dtcs.htm
If you looked it up there, you would have found this:
DTC 29 = Secondary Air Injection (AIR) pump circuit
....which explains why everyone has told you its the AIR pump. In the 93-95 OBD-I cars, the PCM only checks the electrical circuit to the pump relay, and if the circuit is "open" it sets the code. Check the fuse for the AIR pump. If you replace it, and it continues to blow, the pump may be siezed up from rust. If you simply unplug the harness connector from the AIR pump, and then replace the fuse, you will not get a DTC code.
Registered User
Joined: Mar 2006
Posts: 427
From: Perrysburg, OH
Sorry for bringing this thread back to life. The same thing happens to me. I rented an Actron CP9145 Autoscanner from a local parts store and it read a
Code 29, "Output Driver Module (ODM) Fault, EAS Circuit".
I read through Shoebox's codes and was wondering if it really is the
DTC 29 = Secondary Air Injection (AIR) pump circuit
fault, then why is the reader saying it's something different?
I pulled the Air Pump fuse and it was blown, I guess I just don't understand why the Code Reader gave me a different name for the code. Lastly, is this recall still good, or should I just disconnect my air pump and forget about it??
Code 29, "Output Driver Module (ODM) Fault, EAS Circuit".
I read through Shoebox's codes and was wondering if it really is the
DTC 29 = Secondary Air Injection (AIR) pump circuit
fault, then why is the reader saying it's something different?
I pulled the Air Pump fuse and it was blown, I guess I just don't understand why the Code Reader gave me a different name for the code. Lastly, is this recall still good, or should I just disconnect my air pump and forget about it??
Registered User
Joined: Feb 2023
Posts: 62
Re: SES Question: Code 29 eas electrical fault
I'm getting the same fault now. I had removed all the air pump wires, etc. on this car. I re-added the 12v wire going to the PCM from the air pump fuse to the PCM but still get the code. What am I missing?
Administrator
Joined: Nov 1998
Posts: 71,098
From: Hell was full so they sent me to NJ
Re: SES Question: Code 29 eas electrical fault
Year of vehicle?????
94/95 (93, 96/97 could be different).
You have to have the brown wire from the PCM to the AIR pump relay E4 - that's the ground, supplied by PCM. The relay resistance has to be in the circuit.
You need 12 volts to pin E5 of the relay.
The fuse for the AIR pump needs to be good. That's the circuit the DTC 29 diagnostic looks at.
See wiring at top of this schematic.
http://shbox.com/1/1995_pcm4.jpg
94/95 (93, 96/97 could be different).
You have to have the brown wire from the PCM to the AIR pump relay E4 - that's the ground, supplied by PCM. The relay resistance has to be in the circuit.
You need 12 volts to pin E5 of the relay.
The fuse for the AIR pump needs to be good. That's the circuit the DTC 29 diagnostic looks at.
See wiring at top of this schematic.
http://shbox.com/1/1995_pcm4.jpg
Registered User
Joined: Feb 2023
Posts: 62
Re: SES Question: Code 29 eas electrical fault
it's a '95 engine and computer. I see now that I didn't look close enough at the wiring diagram. The one you linked is more clear than my service manual. Took me a couple hours to take out some old relay terminals where I had cut the wires, solder new wires on the and put them back in the Air Pump relay spot and get all the wires connected. i only hooked up the 2 power leads and the wire to PCM since I no longer need power to the pump itself. No code now! And before, my fans were turning on right after start-up whereas now they don't turn on until engine gets warm.
Thanks again for the help.
Thanks again for the help.
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