8 different codes all of a sudden.

**94ndta** · 10-19-2014, 04:23 PM

Back ground on my car, last year I did a h/c install, everything went pretty good, it is currently on a mail order tune. I had some oil pressure issues that I fixed, a battery draw, and hard starting when the car has been up to operating temps. Basically it stumbles to life, but always starts. Car has new plugs, wires, gm opti, original coil, and an electric water pump. I am assuming the water pump is causing the draw, but I will sort that out later.

After changing the coolant one last time, the car all of a sudden popped up a check engine light. Scanned it, DTC CODES 42 43 44 45 51 53 54 55.

I checked the car, assuming I left something unplugged, or bumped something, but I can't figure it out. There is no change in drivability, idle, no missing. The car acts exactly the same, except it has the codes. I am currently puttin the car into storage, and will be dealing with the codes next year. I have not hammered it down, as I am waiting to get it on a dyno to make sure all is well.

All ideas welcome. Let me know if you need more info.

**englundjd** · 10-19-2014, 09:29 PM

google those codes and see what you come up with.

**GaryDoug** · 10-19-2014, 10:04 PM

I have seen this before. Those are bogus codes. Any group like that containing DTC51 isn't to be trusted. Most likely cause is low battery voltage or bad power/ground wiring to the pcm.

**94ndta** · 10-20-2014, 09:03 AM

Originally Posted by GaryDoug

I have seen this before. Those are bogus codes. Any group like that containing DTC51 isn't to be trusted. Most likely cause is low battery voltage or bad power/ground wiring to the pcm.

That would make sense. This battery (new) I had to bring back to life a couple times because I forgot to unhook it (because of the draw). The voltage looks ok on the dash, but I suppose I should read it with a voltmeter.

For the codes, here they are.
42 - Ignition control circuit, short or grounded
43 - Knock sensor circuit
44 - Bank 1 (left) O2 sensor, lean
45 - Bank 1 (left) O2 sensor, rich
51 - EEPROM program error
53 - System voltage high
54 Fuel pump circuit low voltage
55 - Fuel lean monitor

Some of them don't even make sense, like the o2 being rich AND lean?

Looks like it might be the battery or am electrical gremlin....yay!

**94ndta** · 01-20-2015, 07:00 PM

I'm going to bump this again. In the spring, I'm bringing my car back to my place and starting working on it again. Now I am pretty sure the draw is related to the electric water pump, as electrically that's the only thing I changed. It works as it should, only comes on when I start the car, but I'm wondering if I did something wrong when wiring it up. What are some other things I can check for the draw? Pretty sure I will need a new battery, too, which sucks as this is another brand new battery down the drain. Thanks.

**bustedassz28** · 01-20-2015, 07:59 PM

Does it have an aftermarket alarm?

**bustedassz28** · 01-20-2015, 08:03 PM

or aftermarket stereo and/or amplifier?

**94ndta** · 01-20-2015, 08:04 PM

Originally Posted by bustedassz28

or aftermarket stereo and/or amplifier?

Nope on both.

and no on the alarm.

**GaryDoug** · 01-20-2015, 09:41 PM

Here is one way to go: Buy a digital clamp meter to measure the battery drain while you pull fuses.

http://www.ebay.com/itm/New-MASTECH-...1cc&rmvSB=true

**94ndta** · 01-21-2015, 10:00 AM

Originally Posted by GaryDoug

Here is one way to go: Buy a digital clamp meter to measure the battery drain while you pull fuses.

http://www.ebay.com/itm/New-MASTECH-...1cc&rmvSB=true

That's a cool gadget. I have a volt meter, so I should be ok.

i supposed I could just disconnect the power wire to the ewp, and that would eliminate it right there.