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Old 11-21-2009, 08:28 PM   #1
Scooby Newbie
Member#: 137992
Join Date: Jan 2007
Question P0600 code and Er HC, Er SS

My car is a 05 LGT MT, My speedometer stopped working and the car threw all those codes... My dash looks like a Xmas Tree!!! ABS, Check engine Cruise control.... everything is blinking!

Anyway I verified and found one of the wheel speed sensors broken, I am hoping that this will solve the speedometer and the Er SS code.

But does anybody has any idea what the Er HC and the P0600 could mean?

What should I check?,

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Old 01-11-2017, 11:13 PM   #2
Scooby Newbie
Member#: 461143
Join Date: Jan 2017

Ttt, Have you found out what is happening yet? I just bought an 05 Impreza with CEL code P0600 as well and my speedometer jumps around between shifting. My Cruise light is also flashing. Hoping to find the issue out soon.
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Old 04-21-2017, 08:54 AM   #3
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Member#: 23519
Join Date: Aug 2002

'08 Outback manual with the same issues, any help would be appreciated.
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Old 04-21-2017, 12:30 PM   #4
NASIOC Supporter
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT


Likely is a bad ground to one of the "black boxes" in the car which trips the CEL. It could also be a bad wiring harness.

More background info, like, what work was recently done to the car may help.

Some more reading....... https://www.obd-codes.com/p0600
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Old 05-02-2017, 09:59 PM   #5
Scooby Specialist
Member#: 3251
Join Date: Dec 2000
Chapter/Region: NWIC
Location: Buckley, WA
2009 WRX Hatch


Just thought I would share...I can reproduce this *almost* every time. It's definitely a "communication" issue, at least with me.

I have an OBDLink LX bluetooth scan tool (the green one) to link to my phone (Google Nexus 5X) to run Torque Pro. I also have the "ActiveOBD TQ" plug in for Torque which gives you a few more parameters to read.

Every time this has happened when I've stopped for gas.

1. Start the car, plug in LX adapter, start Torque, everything is OK.
2. Turn the car fully off, but leave Torque running on phone.
3. Start car up. Dash goes into X-mas tree mode, P0600.

And to fix it, I just clear the codes with a cheapo OBD tool that I have.

What's interesting is I bought this more expensive bluetooth adapter as it's supposed to be more reliable and offer better compatibility than the "cheap $15 Chinese" adapter. To be sure, the LX never loses connection like the cheap blue one did however, I never had a P0600 thrown with it in any situation.

Edit: I forgot to post my work around. I just need to make sure to kill Torque when I turn the car off, and start it fresh when starting the car after it's started.

Last edited by meebs; 05-02-2017 at 10:02 PM. Reason: work around
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Old 05-03-2017, 04:13 AM   #6
Scooby Newbie
Member#: 3409
Join Date: Jan 2001
Chapter/Region: NWIC
Location: Oly
98 My FMIC
Is bigger than yours.


Do you have one of those insurance dongles plugged into your OBD2 port? Or anything, for that matter? Get rid of it.
How about anything plugged into the power outlets/cigarette lighter? Remove all of it, as your first step.
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Old 04-28-2019, 08:47 PM   #7
Scooby Newbie
Member#: 500929
Join Date: Apr 2019
Default Same issue

My suburu threw these codes last night. I got home and parked it. I have been researching and researching (mechanic isnít open today and I have to work tomorrow). Any suggestions on what to do? I unplugged my insurance thing they have you plug in, took it to a car store and they gave me the codes and told me they didnít know what it meant. Iím at a loss and would love some help!!! If I do have to take it in to get fixed, how much am I looking at potentially spending?
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