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Gen 1 Prius Error Code Help

The codes provided indicate issues with the anti-lock brake system and regenerative braking system. Specifically, code C0279 suggests a short circuit in the ABS solenoid relay circuit. While codes provide information about detected problems, they do not precisely identify the faulty part. To diagnose the issue, a mechanic would need to review wiring diagrams and safety procedures, then systematically test components like the wiring and relay that could cause the described short circuit problem. Fixing the issue related to code C0279 may also resolve the other codes involving the braking systems. Precise diagnosis requires careful inspection and testing of relevant parts.

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426 views6 pages

Gen 1 Prius Error Code Help

The codes provided indicate issues with the anti-lock brake system and regenerative braking system. Specifically, code C0279 suggests a short circuit in the ABS solenoid relay circuit. While codes provide information about detected problems, they do not precisely identify the faulty part. To diagnose the issue, a mechanic would need to review wiring diagrams and safety procedures, then systematically test components like the wiring and relay that could cause the described short circuit problem. Fixing the issue related to code C0279 may also resolve the other codes involving the braking systems. Precise diagnosis requires careful inspection and testing of relevant parts.

Uploaded by

Francis
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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> Gen 2 (2004-2009) Toyota Prius Forums > Gen 2 Prius Main Forum > Generation 1 Prius

Discussion >

Getting codes C0279, C1213, C1259


Discussion in 'Generation 1 Prius Discussion' started by Saquibs2004, Feb 21, 2012.

1.

Saquibs2004New Member
Joined:

Dec 29, 2011


26
0

Location:

Piscataway, nj

Vehicle:

2002 Prius

Model:

----USA----

I went to the dealer and they gave the following codes:

C0279: +B Short Circuit in ABS Solenoid Relay Circuit


C1213: HV System Communication Circuit
C1259: HV System Regenerative Malfunction

However, the dealer didn't say which part needs fixing. Anyone know what parts need
replacing because of these codes? Thanks.

P.S. I've been asking a lot of questions because I just got this car and I want to know what to
fix.
#1Saquibs2004, Feb 21, 2012

2.

seilertsBattery Curmudgeon
Joined:

Mar 7, 2010
3,326
1,451

38

Location:

Santa Fe, NM

Vehicle:

2005 Prius

It is probably a bad relay.

If they decide that it is an ECU, don't buy a new one, there are plenty of salvage ones out
there.
#2seilerts, Feb 22, 2012

3.

ChapmanFSenior Member
Joined:

Mar 30, 2008


4,097

1,882

Location:

Indiana, USA
Vehicle:

2010 Prius

Model:

IV

Saquibs2004 said:
C0279: +B Short Circuit in ABS Solenoid Relay Circuit
C1213: HV System Communication Circuit
C1259: HV System Regenerative Malfunction

However, the dealer didn't say which part needs fixing. Anyone know what parts need replacing because of these
codes?

Nope, nobody does. A diagnostic trouble code isn't an oracle that tells anybody what needs
done to fix the problem. It can only report what problem symptoms the system was able to
detect. Now it's up to you or your mechanic, using your knowledge of how those systems
work, to work through the things that could possibly cause those symptoms and think of tests
you can do that will eliminate some possibilities until you're down to the actual problem.
Then you can think of what you could do that would fix it.

The most useful code to start with here looks like the C0279. The computer is telling you
that the +12 volt circuit supplying an antilock brake relay isn't able to have +12 volts put on it
because somewhere it is conducting to ground with less resistance than the relay coil (edit:
see next post). That's all the computer knows. There could be damaged insulation on the
wire anywhere between the control unit and the relay. Insulation could have failed in the
relay coil itself, or in whatever sources power onto that circuit. The shop manual and the
electrical wiring diagram will tell you what all the parts are in the circuit, the color code of the
wire you need to be examining and exactly where it runs. You can see these manuals online
at techinfo.toyota.com for a small subscription fee or you can buy paper copies from their
Materials Distribution Center (800)622-2033. The manuals also have step-by-step tests for
each trouble code; if you look up C0279 you should find suggested tests in an order likely to
home in on the source of the trouble quickly.

C1259 is a code logged in the HV ECU when there is some problem with the braking
system. The C0279 is a problem with the braking system so I would concentrate on fixing
that, then clear the codes and see if the C1259 comes back.

Not so sure about the C1213 but I would approach it the same way: fix the brakes first, then
see if it's still there.

Hope this helps.

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