ESC - Knock Sensor - Code 43

[jmr302]

Hi! I'm new. Nice place ya got here. Just wandered over from corvetteforum.com. Hope to hang out here often from now on. I have a '93 1/2-ton 2WD Suburban.

 

Does anybody know what sets a Code 43? That's the ESC (knock sensor) code. I just replaced the engine in my truck yesterday. Installed a new knock sensor and I'm positive the connector is on there but for some reason I'm getting this error code.

 

Any ideas or experiences? TIA

[TxDoc]

http://www.gm-trucks.com/cgi-bin....l=knock

 

This thread may be similar.

knightrider2000:

SES light came on the other day, code was P0332 Knock Sensor 2 low.   any ideas what could cause this..  thought it might be bad gas, but run that out.. and put some premium in it and same results..  light usually comes on when cruise is on and going down hill.  

 

racer :

here's a possible answer

Audible Spark Knock (Detonation), MIL Illuminated, DTC P0332 Set (Replace Rear Bank Knock Sensor and RTV Area Around Sensor) #02-06-04-023A

Audible Spark Knock (Detonation), MIL Illuminated, DTC P0332 Set (Replace Rear Bank Knock Sensor and RTV Area Around Sensor)

1998-2002 Chevrolet Camaro, Corvette

 

1998-2002 Pontiac Firebird

 

with 5.7L Engine (VIN G -- RPO LS1)

 

1999-2002 Chevrolet Silverado, Suburban, Tahoe

 

2002 Chevrolet Avalance

 

1999-2002 GMC Sierra, Yukon, Yukon XL

 

2002 Cadillac Escalade, Escalade EXT

 

with 4.8L, 5.3L or 6.0L Engine (VINs V, T, Z, N, U -- RPOs LR4, LM7, L59, LQ9, LQ4)

 

This bulletin is being revised to add Cadillac Escalade and Cadillac Escalade EXT to the Models. Please discard Corporate Bulletin Number 02-06-04-023 (Section 6 -- Engine/Propulsion System).

 

Condition

Some customers may comment on a mild to severe engine ping (commonly referred to as spark knock), usually worse during acceleration and/or an illuminated MIL. Upon investigation, the technician may find DTC P0332 set.

 

Cause

This condition may be the result of corrosion of the rear bank knock sensor due to water intrusion into the sensor cavity. This condition is more apparent on vehicles in which customers frequently wash the engine compartment.

 

Correction

Replace the rear bank knock sensor and build a dam (wall) around the sensor using RTV to divert water away from the sensor. Use the procedure and part number listed below.

 

Remove the intake manifold. Refer to the Intake Manifold Replacement procedure in the Engine Controls sub-section of the appropriate Service Manual.

 

 

 

Remove the wiring harness assembly from the knock sensor.

 

 

 

Remove the rear bank knock sensor.

Install the new rear bank knock sensor. Tighten

Tighten the knock sensor to 20 N·m(15 lb ft).

 

Install the wiring harness assembly to the knock sensor.

 

 

 

Apply a bead of RTV silicone sealant approximately 9 mm (3/8 in) wide and 6 mm (1/4 in) high along the outside edge of the ridge on the engine block valley cover around the rear bank knock sensor. DO NOT form a complete circle. Leave the rear section open as shown.

From the underside of the intake manifold, completely remove the rear intake manifold seal (foam material).

Install the intake manifold. Refer to the Intake Manifold Replacement procedure in the Engine Controls sub-section of the appropriate Service Manual.

 

EDZ Z71

I had the same thing happen on my Avy not to long ago. I thought the same thing. It eventually went out. When it came back on I took the truck to the dealer. They replace one of the O2 sensors and this cleared the SES. I drove up the road about 5 miles and the SES came back on. U-Turn and back to the dealer. They kept my truck and put me in a rental. Put in a new computer(?) and this fixed it for about 40 miles. Back to the dealer again. This time the dealer reset the light and told me he didn`t have a rental and he knew the light would come back on but to give it a try anyway. This time it was about 15 miles. So back to the dealer again. They kept my truck for about a week and when I picked it up they told me that they had found a grounded wire in one of the O2 sensors that was causing my problems. Since then(about 4 weeks and 1000 miles) no problems. It took 4 trips over the course of 3 weeks to get it right, but they finally did. Good thing I was getting tired.

 

Sorry so long winded.

[jmr302]

Thanks for the reply.

 

My 93's knock sensor setup is a lot different than the LS1 though. It has single wire sensor that threads into what is normally a coolant passage plug on the bottom of the block just above the oil pan rail. I'm sure it sees water all the time there. I'm not sure it's as sensitive as the LS1 units which are in the lifter valley. Also this is a brand new sensor that has never gotten wet.

 

I think I'm going to track down the old one and put that back on.