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Overvoltage over voltages

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How do I fix this problem?

the p 0420 is the HO2S bank 1 or cat converter below efficiency threshold
replace the HO2S first as it is the cheapest then replace the cat converter bank 1
have the accredited auto electrician bench test the alternator and regulator for over voltage

Nov 13, 2015 | 2001 Chrysler PT Cruiser

1 Answer

Service engine soon light is on, and the codes its giving are f110p and 1891p

P1891 20500 System Voltage High Input
This fault sets when the alternator is failing. But instead of failing where the voltage is too low it is too high. This is just as bad if not worse than too low. Your 7 series is full of computers and when they see this high voltage they start to go into failsafe to protect themselves. The overvoltage could even cause modules(computers) to fail.
Some modules very effected by this is the DSC control unit, EGS Transmission control unit. This type of problem will come and go due to the alternator is intermittently overcharging.
Now there MIGHT be other things going on but it ALWAYS is a bad alternator with the overvoltage fault in my experience. This alternator is a bit hard to do so I do recommend having the dealer replace it. Make sure you tell them about the overvoltage and even this post as most tech's easily overlook this fault and go chasing the "failsafe" problem and never stop to look at the big picture --system voltage.
I hope this information is helpful. Please accept and let me know if I can help you further.Thank you.

Jun 25, 2014 | 2004 BMW 745i

1 Answer

I have a P0A94 CODE and PA094 pd

prius huh, one of the most complex cars made and you want
DIY diagnosis? ever work high voltage and currents?

if not get it fixed.
first connect a prius aware scan tool and see if there are more DTCs.
Trouble Code: p0a94
DC / DC Converter Performance
Trouble Code Conditions:
The monitor will run whenever the following DTC is not present: - Boost converter overvoltage (OVL) signal detection (circuit malfunction)
Possible Causes:
  • * Inverter with converter assembly

this is high voltage system, and has killed mechanics fiddling it with out HV certifications.

Feb 27, 2014 | 2009 Toyota Prius

1 Answer

Overvoltage message ford MONDEO

Over voltage would likely be related to the alternator voltage regulator. Electrics can cause intermittent problems - You can easily measure the voltage with a multimeter 13.5 - 14.5 volts would be pretty typical if the voltage is much higher than this then the regulator needs attention.

Jan 16, 2013 | 2008 Ford Mondeo 1.8

1 Answer

1997 jeep cherokee sport

You have a possible issue with the voltage regualtor inside of your alternator.
You can drive to Autozone & have them test for under voltage & overvoltage condition, appears to be a voltage regulator failing.

Let me know how it turns out for ya!
Good luck to ya....

Jan 13, 2012 | 1997 Jeep Grand Cherokee

1 Answer

What does overvoltage stop quickly on a volvo s60 means

the overvoltage warning is telling you that the onboard commputer has seen to much volatge this is caused by your altnator there is a voltage regulator in the altnator that keeps the voltage output around 13.6 any higher can do perpent damage to the electronics on your car that is why it says stop quickly.

Jan 27, 2011 | 2002 Volvo C70

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A vehicle alternator control device in which, when a signal detection portion detects a determined input signal, an operating mode of an overvoltage warning portion is switched to a detection operating mode by an overvoltage warning operating mode switching portion. In the detection operating mode, the overvoltage warning portion is activated when a voltage below a determined voltage has continued for a time that is less than a determined time. Accordingly, checks related to the operation of the overvoltage warning portion can be completed in a short time at a plant or the like.

Mar 01, 2009 | 1997 Mercury Villager

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1995 jeep cherokee 4.0 2wd country overvoltage

voltage regulator could be bad but i think its your battery draining or putting a strain on the atl then the v regulator will try to regulate
its job by upping the juce

Nov 29, 2008 | 1998 Jeep Cherokee

1 Answer

Fog lights out on 2001 passat.

The only way a lot of bulbs can burn out at once is overvoltage. Check your charging voltage with the car running, using a multimeter. Should be 13.8 volts; with the car off, about 12.6.

Jun 02, 2017 | 2001 Volkswagen Passat

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