P1189 (2001 3.4ltr Grand Am)

[kvr901]

I used to be a mechanic, but have been out of the business for 20+ years.

Last year I purchased a Solus Pro with 8.2. My wife has a 2001 Pontiac Grand Am 3.4 liter V6 with 110,000 miles

Last summer the service soon (or similar) idiot light came on. I checked the codes and found only a P1189. I disconnected the oil pressure switch plug, and plugged it back in and reset the code. Nothing showed up for 10,000 miles until the past few days. Same thing (P1189, unplugged, plugged in, cleared code, all appears well).

Do these switches often fail? Or, does the connector terminal typically fail?

The P1189 code is not mentioned in the Solus Pro code list. I called Snap-On diagnostics. They told me the P1189 is not in the latest software either.

Any thoughts?

TIA

[GM guy]

P1189

Thanks for the heads up on missing tip. I have added it to our db for 11.4 release. Here is a quick desc & diagnostic:

P1189 will set if PCM detects that the oil pressure switch signal circuit is high.


KOEO, observe the Low Engine Oil Pressure Switch parameter, If parameter displays Low, condition is intermittent. If displays high, Turn OFF the ignition. Disconnect the engine oil pressure switch connector. Connect a fused jumper wire between the oil pressure switch signal circuit and a good ground. KOEO, If parameter displays Low check for open or high resistance in signal circuit. If displays high suspect short to voltage on sig circuit or faulty oil press switch if hi reading goes away when disc sensor.

Also check the connector for oil saturation, melted insulation or loose fitting terminals.
HTH

[Crusty]

I used to be a mechanic, but have been out of the business for 20+ years.

Last year I purchased a Solus Pro with 8.2. My wife has a 2001 Pontiac Grand Am 3.4 liter V6 with 110,000 miles

Last summer the service soon (or similar) idiot light came on. I checked the codes and found only a P1189. I disconnected the oil pressure switch plug, and plugged it back in and reset the code. Nothing showed up for 10,000 miles until the past few days. Same thing (P1189, unplugged, plugged in, cleared code, all appears well).

Do these switches often fail? Or, does the connector terminal typically fail?

The P1189 code is not mentioned in the Solus Pro code list. I called Snap-On diagnostics. They told me the P1189 is not in the latest software either.

Any thoughts?

TIA

I think the switches are fairly common. I've seen a few where the oil pressure is fine. Replaced the switch/sender & no more code set. Everytime I checked one, the problem wasn't there but the failure records showed an increase in the number of occurances. I don't just throw parts at them. I'll check it, the problem isn't there, then I'll tell the customer ot watch the oil pressure guages or warnings and I check it a few days later and the counter has increased.
No codes have returned, even though I've checked them several times after switch replacement.
Change the switch. Up here in Canada, they're only abot $34.00 and easy to get to, just above the starter (just don't make any sparks-!!! LOL, I drape a rag over the starter before I start. Done 8 minutes later)

[SnapOnKid]

.... just above the starter (just don't make any sparks-!!! LOL, I drape a rag over the starter before I start. Done 8 minutes later)

let see you do that on jack stands and a creeper in the drive way... LOL

[Crusty]

let see you do that on jack stands and a creeper in the drive way... LOL

Learned the trade in a small shop that didn't have a hoist. Add another few minutes for jacks & stands. No problem. Actually some things are easier on jacks/stands. Depends on what you're doing and the ergonomics of the activity.
Still an easy job that's inexpensive for both time & parts.

[SnapOnKid]

Learned the trade in a small shop that didn't have a hoist. Add another few minutes for jacks & stands. No problem. Actually some things are easier on jacks/stands. Depends on what you're doing and the ergonomics of the activity.
Still an easy job that's inexpensive for both time & parts.

I was just yanking your chain... I Figured it was probally cold as hell were ever your at and doing in on a drive way in cold A$$ weather sucks but your right it can be done.

[Crusty]

I was just yanking your chain... I Figured it was probally cold as hell were ever your at and doing in on a drive way in cold A$$ weather sucks but your right it can be done.

LOL....Ya, I'm just an 'Ol-Fart. It does get a little cold up here in The-Great-White-North. Especially compared to SoCal.....That's one reason I bought the shop years ago. No more driveway work-LOL.

[kvr901]

I think the switches are fairly common.......

That was it. What a POS! And some wonder why people don't buy American products.... sheesh.

Thanks for the input, Crusty.


BTW: Snap-On, What's with the B2600 "Undefined code" rubish? Several google searches to find out that a burned out low beam can cause a B2600 code in a 2001 Grand Am. This should be in 8.2 (for a 2001 car), and should be a FREE update now!