Appreciate the reply. Serious question...if I understand correctly, it's a non-interference engine. Right? So if the chain were to break, it would likely be the same repair as just replacing the chain (maybe some added damaged due to the chain being broken, but nothing major), correct? I assume as it wears more, the engine will run rougher and the issues will become more urgent.getting it fixed the sooner the better....
Vehicle is at the dealership now. Oddly enough, the CEL has not come back on. I've put on around 1,000 miles since Friday afternoon when it was reset. So...maybe there is some truth to the oild filter being a potential cause. Guess I'll see what they say.Well crud. Dug through some paperwork and found that the engine was swapped out because of chain slippage, causing valve contact and significant compression leakage. So I guess I'm stuck biting the bullet....on a vehicle that I've owned for about a year and a half. :-(
I recently purchased a 2010 Traverse with 82k miles. Within 24 hours the engine light came on and the acceleration was jumpy. Error Code P0008. The dealership says they have ordered a position sensor and they believe this to be the problem. After what I have read on these forums, I find it hard to believe that is the only thing wrong with my vehicle. Any input? I am not mechanically inclined and really want them to fix it right while its under their care/costs...From page 9-42 of the Service Manual;
DTC P0008: Engine Position System Performance Bank 1
Circuit/System Description: The engine Control Module (ECM) tests for a misalignment between both camshafts on one bank of the engine & the crankshaft. The misalignment would be at an idler sprocket for either bank or at the crankshaft. Once the ECM learns the position of both camshafts on one bank of the engine, the ECM compares the learned values to a reference value. The ECM will set a DTC if both learned values for one bank of the engine are exceeding a calibrated threshold in the same direction.
Conditions for running the DTC:
- engine operating for > 50 seconds
- engine coolant between 0-95 C (32-203 F)
- calculated engine oil temp < 120 C (248 F)
- the engine must accelerate such that the CMP actuator system is commanded from the park position to the phased position. This is considered a cam control cycle. There must be a minimum of 2 cam control cycles for at least 2.5 seconds each, in the phased position.
- DTC 0008 run continuously once the above conditions are met, approx 600 seconds
Conditions for setting the DTC:
The ECM detects that both camshafts on either bank of the engine are mis-aligned with the crankshaft, greater than 6 degrees, for greater than 4 seconds or a cumulative of 30 seconds.
The presence of DTC P0008 along with P0016, P0017, P0018 and P0019 indicates a possible condition with the primary timing chain and the alignment between both intermediate sprockets and the crankshaft. Or, the crankshaft reluctor wheel has moved and is no longer referenced to top dead center (TDC)
Observe the scan tool CMP Desired, Actual, and Angle Variance parameters before a DTC sets. This may help to isolate whether a condition is specific to one camshaft, one bank, or caused by a condition with the primary crankshaft timing.
Circuit / System Verification
1. Clear the DTCs with a scan tool
2. Allow the engine to reach the normal operating temperature.
3. Idle the engine for 10 minutes or until a DTC sets. Observe the DTC info with a scan tool, DTC 0008 should not be set.
4. Operate the vehicle within the "Conditions for Running the DTC" to verify the DTC does not reset.
1. Inspect the timing chains and tensioners for excessive wear or misalignment - repair as necessary
2. Inspect the crankshaft reluctor wheel for being mis-positioned on the crankshaft - repair as necessary
Get to the dealer QUICK.I am having the same problem with a 09 Chevy Traverse. Naturally the Chevy dealer does not now what a P0008 code is but ONSTAR and AutoZone do But for 47.58 I can bring it in and get a diagnostic test from the Chevy dealer ran. Then all I have to worry about is the Chevy dealer actually being honest and telling me what exactly is wrong. This vehicle is as I stated a 09 and has less than 100,000 miles on it.
I think it was the 2009's that had a software patch to the ECM or PCM to allow more variance before the CEL was set for this code.Is there any other way to deal with the P0008 issue? Could the ECM be reprogrammed to allow a little more variance in the timing before throwing the code?
The timing chain can jump when it's shut off if there's slack in it due to quick stopping of the engine. I've seen this a few times on belts and chain engines. Since it just happened it may not had enough time to check itself for a problem so no codes yet.I have a 2010 Traverse, just flipped 100,000 miles. a couple of days ago I drove it with no problems, the next morning I tried to start it, it turned over but wouldn't start. I towed it to an auto shop they told me that no codes came up on the diagnostics & the "feeling" was it was the timing chain. Quoted me a $4000 to fix.
I didnt believe them so im getting a second opinion from another mechanic, he said he didnt feel it was timing issue related.
My question is could it be something as easy as a bad alternator?
I was thinking last night that if the timing chain was stretched enough it may set a code before failure like most do.I did smell fuel when I was trying to start it, kinda like it was flooded.
I just really have a hard time believing that the timing went all of a sudden with absolutely no indication.
THANK YOU FOR THE INFO.