Hello my name is Alex. I'm new but I've been reading this forum for a few months now. Recently I bought a 2006 2.4l HHR. I'm assuming one of the earlier models since it has the oil cooler. Anyways, I'm having problems with the car and can't seem to track down exactly what it is. Itll run and then like tonight I'll read 12.83 volts at the battery and it won't even try to turn over. I've had numerous problems with the car since I got it. It was sold as 190k my thinkdiag+ scan tool read 350k. Anyways I've gotten a decent amount of the problems sorted out but the main ones that keep occurring and no matter how much I research and read, I'm just not far enough along with my automotive technical skills. The instrument cluster and Drr are the 2 modules that will randomly throw the b1325-03 code. But unlike other codes or other modules that have thrown that code; underneath it'll read "LAST IGN CYCLE:PASS THIS IGN CYLE:PASS SINCE DTCS CLEARD:PASSED" but for the IC and DRR it doesn't read anything when it throws that code. RARELY, ill get a "SYSTEM STORED INVALID SERIAL DATA" code for the ECBM but that has only happened maybe 3 times in 6 months and everytime I clear it, it doesn't come back. I've recently acquired a decent amount of teaching equipment since I'm considering going back to school for it. Can hi and can low would look good for the most part, they'd mirror one another. I'm using a hantek 1008c. But the serial data reference pic compared to the serial data waveform image I get definitely looks off. And then it'll look ok and then off again. I feel like I'm a little in I've my head and would really appreciate some direction as what I should try/do. Any help/advice would be greatly appreciated

 

Hmm, interesting! 12.8 volts a sign of a dying battery, have the battery load tested at your local parts palace, it might have a cell that’s on it’s way out.
Inspect ground locations and the fuse box under the hood.

Welcome to the site!

the difference in indicated miles tells me some PO changed the instrument cluster and didn’t VIN match it to the HHR.

 

B1325-03 means "voltage below threshold". I.E.: dead battery or loose wire.
Sometimes the connector from the battery to the underhood fuse box gets loose or corroded.
190 miles = 305 Km. The data is stored in the BCM. If the VINs don't match the instrument panel does not display speed or odo data.

using a code reader as a novice is dangerous. Until you get some experience don't rely on what you think it is telling you. You will end up chasing ghosts. Don't ask how I know.
Not many mechanics have a clue how to use the info provided, they just read the test description (which usually doesn't say what it "means").

 

But when I took apart the front and back probed the voltage wire, at the time it was reading 13 98, which was the same as the battery voltage. I'm assuming that I have a parasitic draw somewhere bc when I let it sit for a day or so is when like what yesterday happened. I first tested the battery and it read 8.07 volts. I unplugged the positive and negative terminals. And then checked the battery again. It was at 10 80 volts, literally as soon as I unhooked the terminals and checked it with the multimeter. Ive had the battery load tested abt 2 months ago and it was fine. But with the cables unhooked I sat there and watched the battery slowly go up from 10.80v by .01 every few seconds. That really surprised me. I checked the resistance and voltage drop along the main power and grounds. And only had to change the wire from the starter to alt. I know the BCM, RADIO, IC, VCIM, DRR AND maybe 1 more module make up the serial data network . Any chance that faulty wiring or a bad module vould be causing this? Oh i was Also getting 3 miles to the gallon. I changed the cam senors and solenoids, spark plugs, and I'm waiting on the new 02 senors to arrive. I'm now getting abt 16 mph in the rural country. Does this sound abt right? I bought the hhr bc im rebuilding the engine on my audi but it ended up me putting of the audi and working on the hhr just so I'd have a way back and forty. Anyways I appreciate it. Im.going to get the battery load tested again after work today and I'll recheck the main power connections.

 

It could be a bad ground, damaged wires loose fuse box halves , corrosion.

 

I haven't any problems with it so far when it comes to intermittent no starts. But I have been keep ot on the trickle charger at night. It has auto shut off so that it doesn't over charge the battery. I just recently got my vcx nano to finally work with tech2win. The vcim randomly lost communication when I tried to pull the module ID. So I cut the car off, took out the key, unhooked the nano and replaced and cranked it. I was able to pull the module info that time. I had a random code a while back abt cellular comms(I can't remember exact code) but I cleared it amd didn't pay attention. Can the vcim cause any major issues? Also when I was watching the data display for the transmission, at idle; my rpm was abt 788, my iss was abt 100 under that. Is that normal? The ckt showed up as intermediate. So I'm assuming I need a new crankshaft sensor. The starter was cover in oil when I first got the car and the sensor is located right above that. I'm also getting misfires on cylinder 3. Any advice on what to do abt these things is greatly appreciated. I hope everyone had happy holidays and a new year.

 

Yes! VCIM is famously a prob. Pull fuse #24 on the BCM.
I don't know what this means. Rare for a crankshaft sensor to fail more likely the chain is going. P0016-P0017.

 

I suggest you remove the crankshaft position sensor, clean it and put it back into place, clean the connectors and try it again.
that sensor doesn’t usually fail. But it might get oily.

 

Load testing is just one test. It does not prove it’s a “good” battery. It only proves it will start the car. I does not prove it will hold adequate voltage for any length of time.