2000 Eldorado ETC 50K miles. Last night without incident, car was driven from cold start about 3 miles (approx 5 minutes) to a stop sign. While at stop sign engine died -- all other functions appeared normal (e.g. lights, radio). Car restarted without problem and performed normally for the duration of the trip. This is first time problem occurred.

Pulled codes (only 2 available):
RSS U1016 - Loss of communications with PCM
RFA U1000 - Class 2 Communications Malfunction

Any ideas on what's going on? Search of forum was inconclusive. Doesn't appear to be dreaded crankcase position sensor but maybe this is an early symptom? Thanks.

A mid-warmup slow speed stall is symptomatic of CKP problems. The beginning stalls may or may not set a DTC. Along with the restart you might also get a low voltage code set in one or more modules. (U codes are tied in with voltage swings)

Actually, there's quite a bit on CKP faults, it's just scattered through Seville, DeVille, and Performance over the last 3 years.

If you find AJxtcman's lengthy posts, you may want to diy.

Doesn't appear to be dreaded crankcase position sensor but maybe this is an early symptom?
It sounds exactly like CKP sensors. I am surprised they lasted this long.

I thought they could run 50K miles (minus or plus 10K ).

Thank you very much for the help. I guess its time to replace the CKP sensors.

cadillacboy, A CKP sensor is an electronic Hall effect trigger consisting of a potted coil and magnetic pole piece. It creates an "on-off" signal as the teeth of a reluctor wheel pass VERY close to the tip of the sensor, inducing a tiny electric pulse in the coil/magnet generator. There is normally no external voltage or "bias" applied.

Being a completely passive component, a properly designed CKP should last for eternity. There is no wear or degradation over time.

Exactly why you can take a 1923 Ford vibrator coil, hook it up to 6 volts, and it'll zap your arm to parade rest.

Thanks submariner ,you're verily knowledgeable person . I get improperly design flaw causes problems .That really bugs my mind how the engineers when designing such items make such mistakes ? Don't they test them as they should

replace your CKP's

Thanks submariner ,you're verily knowledgeable person . I get improperly design flaw causes problems .That really bugs my mind how the engineers when designing such items make such mistakes ? Don't they test them as they should
I don't think it was designed wrong. They where made in Mexico. You get what you pay for I guess. When they switched to a Japanese supplier, the problem was solved.

I don't think it was designed wrong. They where made in Mexico. You get what you pay for I guess. When they switched to a Japanese supplier, the problem was solved.

I hope my engine is with Jap supplier part too . As I recall some 305 or 307 engines had some problems with Mexico ones as well.

The switchover was made in early '03. If yours is a 2000, the only question is where they changed or will they have to be in the future. mine is near the crossover point and I am still trying to figure out if a failure is in my future. See my thread in the Northstar section.

Yup,but my engine was replaced in '05 . I gotta ask my question in your thread I think .:)

Had new CKP's installed by Cadillac dealersip. Parts: $153.00 ($74 and $79). Labor: $194.00. Thanks to all for the help.

:rolleyes:........Way back up there...^^^^^.....perhaps "designed wrong" should have been "spec'd wrong".

srx.......Right in the ballpark for the job. It sure looks like every dealer has a different parts price list. You got away with about $50 on the parts total compared to mid-MD pricing. (Which is why I did Pace Performance/Chevy in OH.) Both my originals were from Tequila City.

I have a coworker who just paid $400+ for the job.

I saved the customary $50 - $100 "diagnosis" expense by telling the dealer exactly what parts to replace rather than describing the problem and symptoms. On the service order, the advisor keyed in "customer performed own diagnosis" - I guess to protect themselves just in case the repair didn't resolve the problem. So to everyone who helped, have a virtual 6 pack of Coors on me - just don't drive the Caddys anywhere afterwards.

On the service order, the advisor keyed in "customer performed own diagnosis" - I guess to protect themselves just in case the repair didn't resolve the problem.
Exactly.