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Toyota Service
Toyota Service, Toyota Expert
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2000 Toyota tundra pulls a 300 code,also1305,1310,1320 1340

Customer Question

2000 Toyota tundra pulls a 300 code,also1305,1310,1320 1340 changed out 1 of coils no help
Submitted: 1 year ago.
Category: Toyota
Expert:  Toyota Service replied 1 year ago.

Hello. Welcome to Just Answer. Please allow me to assist you. The P0300 misfire code, and the 1305/10/20/40 are usually attributed to coil issues. On this ignition system, all of the coils share a common ground circuit. The voltage in the coil is prevented from entering the ground circuit via a diode inside the coil. If any of the diodes are bad, they leak voltage into the ground circuit. This is also very common with older and especially non-factory coils. When voltage leaks into the ground circuit, you get coil codes. The problem is finding the bad one. If #2 coil has a faulty diode, there might be no number 2 coil code, but, cylinders 3, 4 and 5 could have coil codes because the computer is seeing the problem only after the #2 coil fires. If this vehicle was in our shop we would be switching coils around until we reduced the code count and then replace that particular coil.

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Expert:  Toyota Service replied 1 year ago.

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