code 552 question
Thread Starter
|
Tuned
Joined: Feb 2023
Posts: 278
Likes: 86
code 552 question
I'm getting code 552 in the KOEO test. TAB circuit fault.
Would I be correct in assuming that because this is happening without the engine running it would point to a bad TAB valve?
I can't see this being triggered by a vacuum issue if the engine is not running and therefore no vacuum is present.
Am I on the right path of thinking here?
Thanks, Jeff
Would I be correct in assuming that because this is happening without the engine running it would point to a bad TAB valve?
I can't see this being triggered by a vacuum issue if the engine is not running and therefore no vacuum is present.
Am I on the right path of thinking here?
Thanks, Jeff
Logistics Pro
Joined: Nov 2013
Posts: 3,921
Likes: 1,191
From: Mojave, Ca
This is an electrical fault code. It's saying your TAB solenoid is either shorted or disconnected. It might be due to damaged wiring, a corroded connector, or a burnt out magnetic coil inside your solenoid.
The computer is looking for a certain amount of resistance on that circuit... I wanna say 10-20 ohm, but I'm just guessing. If it doesnt see that, it'll throw the 552 code.
The computer is looking for a certain amount of resistance on that circuit... I wanna say 10-20 ohm, but I'm just guessing. If it doesnt see that, it'll throw the 552 code.
Logistics Pro
Joined: Nov 2013
Posts: 3,921
Likes: 1,191
From: Mojave, Ca
The TAB solenoid is part of the AIR injection system that pumps fresh air into the catalytic to help burn up hydrocarbons and keep the emissions low. A lot of people remove this system because the expensive pump wears out and makes noise.
Driving it without a malfunctioning TAB solenoid won't cause any problems to the truck or the drivability. It will increase exhaust emissions.
Driving it without a malfunctioning TAB solenoid won't cause any problems to the truck or the drivability. It will increase exhaust emissions.
Trending Topics
More Turbo
Joined: Apr 2018
Posts: 551
Likes: 151
From: King and Queen Virginia
If I recall correctly the TAB solenoid is the same as the 4x4 solenoid. When I done the 1's on 87 the only difference was the key slot in the connector. The orignals on truck you cannot plug in wrong as the connectors were different. Look at your TAB and look at the 4x4 auto locking hub solenoid.
I pulled 4 sets when I was the the pick and pull last time TAB,TAD and EGR.
I pulled 4 sets when I was the the pick and pull last time TAB,TAD and EGR.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Thread Starter
|
Tuned
Joined: Feb 2023
Posts: 278
Likes: 86
Ok, Thank you prototype. I have no emission testing on this vehicle here in Wisconsin. As long it causes no damage to the truck I'm just going to run with it until I find one. If not, future plans were to remove the cat anyway when I upgrade the exhaust. This truck will see less then 500 miles per year as it's a summer weekend toy for hauling my 4 wheelers and boat.
Thread Starter
|
Tuned
Joined: Feb 2023
Posts: 278
Likes: 86
If I recall correctly the TAB solenoid is the same as the 4x4 solenoid. When I done the 1's on 87 the only difference was the key slot in the connector. The orignals on truck you cannot plug in wrong as the connectors were different. Look at your TAB and look at the 4x4 auto locking hub solenoid.
I pulled 4 sets when I was the the pick and pull last time TAB,TAD and EGR.
I pulled 4 sets when I was the the pick and pull last time TAB,TAD and EGR.
Thread Starter
|
Tuned
Joined: Feb 2023
Posts: 278
Likes: 86
Hard code. I have been chasing it for a while now. I made sure vacuum lines to it were intact and in good shape. Checked electrical plug connection, it's clean and tight.
More Turbo
Joined: Apr 2018
Posts: 551
Likes: 151
From: King and Queen Virginia
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
This is a post courtesy of subford.
The KOEO self-test is an electrical test only. So either you are not getting the right voltage back to the computer or you have a power supply or ground problem or a computer problem or a wiring problem in that circuit.
TROUBLE CODES (DTCS) 553 AND 552: CHECK VOLTAGE OF VPWR CIRCUIT.
DTCs 553 and 552 indicate that voltage output for Secondary Air Injection solenoid(s) did not change when activated.
Possible causes:
-- AIRB/AIRD circuits shorted to power.
-- AIRB/AIRD circuits open or grounded.
-- AIRB/AIRD resistance out of range.
-- Damaged Powertrain Control Module (PCM)
The KOEO self-test is an electrical test only. So either you are not getting the right voltage back to the computer or you have a power supply or ground problem or a computer problem or a wiring problem in that circuit.
TROUBLE CODES (DTCS) 553 AND 552: CHECK VOLTAGE OF VPWR CIRCUIT.
DTCs 553 and 552 indicate that voltage output for Secondary Air Injection solenoid(s) did not change when activated.
Possible causes:
-- AIRB/AIRD circuits shorted to power.
-- AIRB/AIRD circuits open or grounded.
-- AIRB/AIRD resistance out of range.
-- Damaged Powertrain Control Module (PCM)
Thread Starter
|
Tuned
Joined: Feb 2023
Posts: 278
Likes: 86
