Help me here please

[Ali Hawi]

2003 gmc Yukon xl 2500 6.0l SLT 4wd

U1000, U1301, U1016, U1041, U1096, U1064

C0300, C0305, C0306, C0321, C0327, C0359, C0374, C0379

B2725, B1000, B3770, B3764, B0434

P0332, P0327, P0300





I have a problem with my 2003 GMC Yukon XL, I have replaced the knock sensor three times with the original wire, but I still have the same problem with the error codes P0332 and P0327. When I press the accelerator and keep the engine rpm at 3000 rpm, I get a third error code which is P0300.



Please help me solve this problem.



Thank you very much,

 

[Fless]

P0332, P0327: a good knock sensor will ohm between 93 and 107 ohms. Are you torquing them to spec when installing? I would also recommend using OE sensors. You might be able to ohm each one through the harness connector (grounding the other lead to the engine block). Does the engine audibly knock?

P0300: this is a random misfire. A higher level scanner will show individual cylinder misfires so you can narrow it down. But a good scanner will also let you run a CASE relearn to be sure the engine crank sensor is in sync with the cam sensor.

B1000: pull the two connectors off of the ECU and check for water migration (especially in the lower part of the connectors) and pin fitment and cleanliness. This could be the cause of the knock sensor circuit codes.

Also test for a voltage drop between the negative battery terminal and the engine, and the positive terminal and the alternator post that has the wire to the battery. These battery cables tend to rot out from the inside.

Lastly, have the battery load tested and the alternator tested. Good luck!

 

[S33k3r]

Actually, I think you may have some wires crossed or a bad ground. I'd double-check your wiring from point to point -- the WHOLE wire. And I'd check all the grounds under the hood, especially the ones going between the engine and the firewall.