Engine light is flashing & tcu
My 2012 chevrolet cruze 1.8 LT started misfiring this morning engine light & tcu is flashing I don't know what's wrong any advice.?
Park it or drive it very slow to a mechanic until the issue is resolved.
Engine light flashing means catastrophic engine failure could occur soon. One or more cylinders is not firing which creates a severe imbalance in the engine as well as unspent fuel being sent through the exhaust which can then cause excessive heat and irreversible damage to the catalytic converter(s).
Always start a misfire or no start/fire condition with checking your air, fuel, and spark. Doesn’t hurt to check fuses and relays as well. I would then move on to using a check engine DTC reader or take it to an Advance Auto Parts store where they can read the codes and give you the description of each code. Actually reading the engine codes can be the first step if you have access to the tool but keep in mind this information only identifies an issue registered by the computer and does not mean the part identified is bad or should be replaced. Further troubleshooting steps are required to verify.
If only one cylinder is misfiring, first clear the current DTCs, then try moving the coil pack from the problem cylinder to another. Run the vehicle, you may have to drive it a little, until the check engine light returns. Read the code, if it is the same cylinder, then examine the ignition wire and spark plug for that cylinder. If all looks good, then swap the spark plug to another cylinder, test, followed by swapping the ignition wire if applicable, and test again. If the engine code changes cylinders after one of these swaps, you can identify your bad part.
If you have a multiple misfire condition, then I would be checking fuses/relays, testing the fuel pressure, camshaft position sensor(s), followed by the crankshaft position sensor. The fuel pump can be tested by using a fuel pressure gauge or have a qualified professional handle this and compare readings with the OEM specs. This step is also dependent on your ability to use a multi-meter and compare your readings with the expected values of the repair manual for your specific vehicle.
Please let me know if this helps or if you have any questions.
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