Service Engine Soon - multiple codes.

Hello trusty Gods of Voyager knowledge, I am hoping for some insight into one of my ailing vans issues.

I had my van in a couple of days ago to have a leak in the power steering fixed, and it also had an oil change.

It had been home one day when the Service Engine Soon light came on, which I wasn't that bothered about as I knew the battery had been disconnected the day before, but I did the on/off - on/off - on thing to check for codes and got quite a few, in this sequence.

I'll put them in both formats (two digits + 4) in case this helps someone searching for similar down the line:

12 - Battery Disconnect
31 or P0443 - EVAP Purge Solenoid Circuit
21 or P0134 - Right Rear (or just) Upstream O2S Stays at Center
66 - two possibles for this one apparently P1698 - No CCD Messages From TCM or P1695 - No CCD Message From Body Control Module
54 - P0340 - No Cam Signal at PCM
66 again
55 - Completion of fault code display

Are these codes in connection with each other ringing any bells with anyone? Is there a possibility something was knocked when they were repairing the power steering leak?

Thank you for any input and advice.

Leah

Your codes are all over the map. I don't see a common thread. What symptoms are you seeing and what model year and engine do you have? If you haven't yet I would clear the codes either with a scanner or by disconnecting the battery for 2-3 minutes then see which codes return.

FYI - A MIL code 12 won't turn on the service engine light. A MIL code 21 has several "P" codes associated with it. It indicates a failure in either of the two O2 sensor circuits. You'll need a scanner or multimeter to determine which circuit has failed. Ditto with a MIL code 31.

I'm not actually seeing any symptoms - I did get hubby to disconnect battery last night to see if it would clear but no joy.

I thought the codes looked a bit random and wondered if it indicated a bigger problem like something failing.

I have the 1997 Plymouth Grand Voyager Rallye - 3.3 L engine.

She's an old girl and moving her to Canada from Texas has hit her hard this year, but she's plodding along and I love her :biggrin:

The only thing I could put my finger on is that she doesn't sound like she used to, but I've had her in the garage several times and no-one has said there is a problem.

No symptoms what so ever? I would think with code 21 and 66 you may see idle, hesitation, shifting, and instrument problems. A code 54 should keep you from starting and/or kill the engine on the road. All is well other than the codes. Well ok. Makes this even more interesting.

Shooting from the hip from states away I would say the PCM may be having a problem with it's code reporting circuit for at least some of the reported faults meaning, it's reporting false errors. First I would connect a scanner and get the "p" codes to narrow down exactly what the PCM is trying to tell you. Then I would consider heading to the dealer and have them reflash the PCM. What's reflash? They will reload the software data the PCM uses to operate.

I've only read of one other case of a PCM with this type of problem. Get more input before you make a move.

Ok. I reread your post. When you say you got hubby to disconnect the battery to see if "it" would clear but no joy, I'm thinking the "it" was the service engine light. The answer we need to know is which codes on your list of codes returned after hubby reconnected the battery and drove it a bit?

Code 54; No cam sensor signal at PCM *should* make the engine stall on the spot. Code 21 may show up on an emissions test. But, gas mileage should take a hit as well for the heated O2 sensor failing.

:2cents:

I think there's a wiring harness, or flaky electrical ground problem at work here. First, the battery cables MUST be good, clean, and tight.

There's a small ground strap on my '96 GV that connects both sides of the motor mount together electrically, not far from the Power Steering pump. If the Mechanics left it out, knocked it off, or hooked it up to a rusty/dirty area of the mounts, then weird things could happen.

I also would like to know what codes you get after clearing them by battery disconnection for 20-30 minutes.

Thank you. We will go out and disconnect the battery again for longer and then I will report back on the codes tomorrow.

After the battery was disconnected last night, all the same codes were back.

I'm not getting any of the problems listed - we've had code 54 before, and it was when the Cam Sensor (I think that is what is was called) died and the car did just keep cutting out. We replaced that and it's been fine since.

Just a thought here. You said you moved from Texas,( dry climate), to Canada, ( wet climate). I have read in some of the other threads for caravans of the bulkhead connectors going bad. Not the whole connector but certain male/female connectors in the bulkhead connector. Wondering if the climate change has caused corrosion or condensation in the connector?

Just a thought here. You said you moved from Texas,( dry climate), to Canada, ( wet climate). I have read in some of the other threads for caravans of the bulkhead connectors going bad. Not the whole connector but certain male/female connectors in the bulkhead connector. Wondering if the climate change has caused corrosion or condensation in the connector?

Good point. By any chance are you close to the Gulf? Might want to take a look at the PCM connections and make sure they aren't corroded. Spray with electrical contact cleaner. ALWAYS disconnect the battery before disconnecting/reconnecting the PCM to prevent any chance of a voltage spike. PCMs are sensative.

Disconnecting the battery for 30 mins cleared the service engine soon light and it didn't come back on. I am hoping that is an end to it but will report back.

It's certainly a lot wetter here in Alberta than it was in Dallas that's for sure, and the extremely cold temps don't help either, but the engine block heater at least helps with that somewhat.

If the lights come back on we'll look at the connections first as the roads are really slushy at the moment, and so the car is constantly soaked in dirty snow and sand.