Code P00B7

2011 CHEVROLET CRUZE
141,000 MILES • 1.4L • 4 CYL • 2WD • AUTOMATIC
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PCDJ64
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Car runs fine, no misfires, no overheating, no continuous radiator fans, good heat, no leaks.

got a CEL for code P00B7, took it to dealer and they said it has a warped cylinder head and will cost $3,200.00.

the water pump and thermostat assembly was replaced last year for a recall, it is not losing a drop of coolant and has never once overheated.
there is no fluid mixing either antifreeze in oil or vice versa.

i reset the light have gone around twenty miles with no return yet of the light.

would a warped head cause massive loss of coolant, smoking and overheating?
the dealer literally had the car for under an hour when they came up with their diagnosis which i do not think is enough time to diagnose a perfectly good running engine with a bad/warped head.
Jan 8, 2018 at 5:55 PM
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MHPAUTOS
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This code is actually P00B7 Engine Coolant Flow Low/Performance, you may have low coolant or a faulty thermostat, faulty coolant temp sensor or an electrical problem with the wiring to the PCM, i would be looking at a thermostat first.

Jan 10, 2018 at 1:28 AM