Learn How to Do Common Repairs on the 1st Gen Chevy Cobalt It’s a detailed job to replace the timing chain since a lot of components need to be removed, so you may need to have a professional replace the timing chain. How to Fix of Timing Chain Tensioner Failure It’s important to address this problem as soon as possible to prevent the timing chain from skipping a tooth on a gear or breaking, which can cause more engine damage. The timing chain is located underneath the covers at the front of the engine and can fail on the 2005 to 2010 Cobalt. Rattling from the timing chain area when cold starting.Timing Chain Tensioner Failure Symptoms of Timing Chain Tensioner Problems on the 1st Gen Chevy Cobalt This may solve the problem, but the cable may also need to be replaced. Some Cobalts had a recall for this problem where a clamp is put on the cable to prevent this from happening. Sometimes the shifter cable fails on the 1 st gen Cobalt and causes problems with the ignition key and shifting gears. Ignition key does not remove from the ignition key cylinder when the car is in park.Shifting Problems Symptoms of Shifting Problems on the 2005 to 2010 Chevy Cobalt Read more about how to inspect the gas cap 4. Replace the gas cap or the fuel filler neck if needed. Inspect the fuel filler neck for corrosion. Test the gas cap’s ability to tighten and ratchet. Check the seal for cracking or other damage, like stretching or broken pieces. Check engine light-possibly for an EVAP code.Gas Cap Failure Symptoms of a Bad Gas Cap Replace the combination switch, also known as the turn signal switch. How to Fix Combination/Turn Signal Switch Failure Turn signal does not turn off after turning the wheel. Some headlight functions on the turn signal switch may not work.Signal comes in on ''P1'' connector and leaves on both.Symptoms of Combination/Turn Signal Switch Failure If you are not used to doing this I recommend disconnecting battery first. If it has never been touched it will have a black zip tie holding the latch just cut it and go at it. I dab dielectric grease on there to help prevent moisture from attacking it again. Re-seating this connector several time often resolves this issue. Sometimes corrosion on pins in connector ''P1'' & ''P2'' will be enough to diminish signal strength enough to kill communication. Or GMLan not making a full path through the BCM. This leaves the Buffer which is powered by the upper left hand corner fuse of the BCM Now a BCM ground failure is usually more catastrophic and you will lose door locks, dome light and a bunch of other stuff like brake lights, cruise and such. So when you have a failure that displays symptoms like chimes going off, cluster screwing up, transmission not shifting or shifting hard and traction lights if you have ABS brakes it kinda points to the BCM. I know this may sound illogical but the ECM or PCM(05-06) doesn't communicate with the TCM directly, the information via GMLan goes from ECM or PCM(05-06) to BCM through a tri-state buffer that squares off the signal and from there it goes to the TCM and other CPUs like radio for chimes, RCDLR, TDM, cluster and so on. ThanksĪctually I found 3 causes for this similar problem. What is the next step here? I am thinking I should pull the connector for TCM and check if I am getting constant power and a good ground? What do you all suggest? Does anyone have the pin out diagrams for the 2005 TCM, BCM, and ECM so I know what to check or can you provide me which pins would be a place to start? I appreciate any help you all can provide. I can reset this code with my code reader and the car will run fine for a few days at which time the same problem reappears. I also tried grounding the TCM to the drivers side strut ground location which did not work. Next I removed grounds G105 and G301 and cleaned with wire wheel. No signs of bent, burned or corroded pins etc. Also pulled ECM and TCM connectors to inspect and clean. Pulled C1/C2 and the red plug on BCM to inspect and clean which all looked good. So far I have pulled ECM/TCM fuse above BCM and in engine bay fuse panel and cleaned, they didn't look bad. Gauges going crazy etc., which seem to be common symptoms. I got a U101 code with Loss of communication with TCM on my daughters 2005 Cobalt LS.
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