CARWATCH
P0378 Error on Mazda
What it means and how to fix it
🚨 Fault Description (P0378)
The DTC code P0378 in a Mazda vehicle is a sign that the onboard computer has registered the following anomaly:
"Timing Reference High Resolution Signal B Too Few Pulses"
Although this is a standardized OBD2 code, the symptoms and the location of the faulty sensor can vary depending on the exact model of your Mazda (year, engine type, etc).
Other frequent faults detected in Mazda:
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Instead of changing parts blindly, use the CarWatch AI assistant. Scan your Mazda's sensors in real-time and find out the root cause of the P0378 fault before going to the shop.
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To clear the engine light and read the P0378 code from your phone, you need an OBD2 adapter compatible with the Mazda ECU.
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