DTC P1B77 and blown High Voltage Plug (fuse)
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DTC P1B77 and blown High Voltage Plug (fuse)
Have a 2014 hybrid. Got the message the other day telling me to pull over and turn off the vehicle so damage would not be caused.
DTC P1B77, which is supposed to be the high power Relay. When I pulled the big orange plug (125a fuse), it's blown.
Before I go spend $400-$500 on the power Relay, wanted to replace the fuse to see if this is the issue. However, can only find the entire assy which is going for $300 at Hyundai!
So doing some research, found out the Kia Optima Hybrid has a similar recurring issue, which Kia has issued a TSB for to replace the 125a fuse with a 150a.
Anyone used the 150a fuse in place of the 125a? Seems like this is a recurring problem with the Sonata Hybrid as well from what I've read, so it's possible Hyundai also under rated the fuse similar to Kia?
DTC P1B77, which is supposed to be the high power Relay. When I pulled the big orange plug (125a fuse), it's blown.
Before I go spend $400-$500 on the power Relay, wanted to replace the fuse to see if this is the issue. However, can only find the entire assy which is going for $300 at Hyundai!
So doing some research, found out the Kia Optima Hybrid has a similar recurring issue, which Kia has issued a TSB for to replace the 125a fuse with a 150a.
Anyone used the 150a fuse in place of the 125a? Seems like this is a recurring problem with the Sonata Hybrid as well from what I've read, so it's possible Hyundai also under rated the fuse similar to Kia?
Senior Member
Joined: Sep 2013
Posts: 2,899
We don't try to second guess the manufacturer, but there may be more to this than we think.
Can you recall at the approx time the message came up, what were you doing with the vehicle? What components were on or working?
If something that the engineers did not anticipate was taking place and placing an unusual current draw on the system, it could cause the fuse to blow.
Is there any special equipment that was added to the vehicle that was not on it when delivered?
Makes us wonder , instead of finding the exact cause and installing a larger capacity fuse ,usually is a no-no any other time.
Can you recall at the approx time the message came up, what were you doing with the vehicle? What components were on or working?
If something that the engineers did not anticipate was taking place and placing an unusual current draw on the system, it could cause the fuse to blow.
Is there any special equipment that was added to the vehicle that was not on it when delivered?
Makes us wonder , instead of finding the exact cause and installing a larger capacity fuse ,usually is a no-no any other time.
Last edited by hanky; Jan 30, 2022 at 10:52 AM.
Thread Starter
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Junior Member
Joined: Jan 2022
Posts: 2
We don't try to second guess the manufacturer, but there may be more to this than we think.
Can you recall at the approx time the message came up, what were you doing with the vehicle? What components were on or working?
If something that the engineers did not anticipate was taking place and placing an unusual current draw on the system, it could cause the fuse to blow.
Is there any special equipment that was added to the vehicle that was not on it when delivered?
Makes us wonder , instead of finding the exact cause and installing a larger capacity fuse ,usually is a no-no any other time.
Can you recall at the approx time the message came up, what were you doing with the vehicle? What components were on or working?
If something that the engineers did not anticipate was taking place and placing an unusual current draw on the system, it could cause the fuse to blow.
Is there any special equipment that was added to the vehicle that was not on it when delivered?
Makes us wonder , instead of finding the exact cause and installing a larger capacity fuse ,usually is a no-no any other time.
No special or aftermarket equipment has been added to the vehicle.
I agree adding a larger fuse is typically a no no, BUT, I was wondering if anyone had tried it with the Hybrid Sonota since Kia issued the TSB for the Hybrid Optima.
Junior Member
Joined: May 2022
Posts: 1
how did you change the fuse?
Have a 2014 hybrid. Got the message the other day telling me to pull over and turn off the vehicle so damage would not be caused.
DTC P1B77, which is supposed to be the high power Relay. When I pulled the big orange plug (125a fuse), it's blown.
Before I go spend $400-$500 on the power Relay, wanted to replace the fuse to see if this is the issue. However, can only find the entire assy which is going for $300 at Hyundai!
So doing some research, found out the Kia Optima Hybrid has a similar recurring issue, which Kia has issued a TSB for to replace the 125a fuse with a 150a.
Anyone used the 150a fuse in place of the 125a? Seems like this is a recurring problem with the Sonata Hybrid as well from what I've read, so it's possible Hyundai also under rated the fuse similar to Kia?
DTC P1B77, which is supposed to be the high power Relay. When I pulled the big orange plug (125a fuse), it's blown.
Before I go spend $400-$500 on the power Relay, wanted to replace the fuse to see if this is the issue. However, can only find the entire assy which is going for $300 at Hyundai!
So doing some research, found out the Kia Optima Hybrid has a similar recurring issue, which Kia has issued a TSB for to replace the 125a fuse with a 150a.
Anyone used the 150a fuse in place of the 125a? Seems like this is a recurring problem with the Sonata Hybrid as well from what I've read, so it's possible Hyundai also under rated the fuse similar to Kia?
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