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Old 06-12-2019, 12:14 PM   #1
Sadsaturn5518
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Dizzy 2003 Saturn Vue P1629

My first post I apologize for length but wanted to get history in here.
I have a 2003 Saturn Vue V6 was dependable transportation until recently.
I was trying to sell this vehicle adn when test driving the car would die while driving. Got Code P1629. Took to my local dealer for Service.
They first replaced the crank position sensor did not solve Issue.
They then said the BCM was bad and replaced that as well. I believe this was true since I could not communicate with BCM with my scanner before.
this did not solve issue either.
I was told the ECM had to be bad. I agreed to replace that as well reluctantly.
They say problem went away but I now had a slight Intake spacer gasket leak they suggest fixing as well. Having $1500.00 wrapped up in repairs already I went adn picked vehicle up and was going to replace the gasket myself if needed. Since then it died on me again. P1629 code came back. I reset the code and drove again. Still dying but no Codes setting yet.
My dealer has agreed to take it back and will do the intake gasket replacement for half labor cost and cost on parts due to my issues.
I have not taken it back yet and saw your forum with similiar posts.
any suggestions ??
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Old 08-20-2019, 09:17 AM   #2
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Default Re: 2003 Saturn Vue P1629

Quote:
Originally Posted by Sadsaturn5518 View Post
My first post I apologize for length but wanted to get history in here.
I have a 2003 Saturn Vue V6 was dependable transportation until recently.
I was trying to sell this vehicle adn when test driving the car would die while driving. Got Code P1629. Took to my local dealer for Service.
They first replaced the crank position sensor did not solve Issue.
They then said the BCM was bad and replaced that as well. I believe this was true since I could not communicate with BCM with my scanner before.
this did not solve issue either.
I was told the ECM had to be bad. I agreed to replace that as well reluctantly.
They say problem went away but I now had a slight Intake spacer gasket leak they suggest fixing as well. Having $1500.00 wrapped up in repairs already I went adn picked vehicle up and was going to replace the gasket myself if needed. Since then it died on me again. P1629 code came back. I reset the code and drove again. Still dying but no Codes setting yet.
My dealer has agreed to take it back and will do the intake gasket replacement for half labor cost and cost on parts due to my issues.
I have not taken it back yet and saw your forum with similiar posts.
any suggestions ??
I am new to this but have not received any replies that i can see on my post. Any ideas? Since my last past I had the GM dealer replace the Intake gasket they said was leaking. I have Almost $2000.00 now in repairs with the dealer. They thought was fixed I drove for a week and teh Vehicle still died and Security light flashed again before dying.Started back up and drove home. Drove next day with no issues again.
They have replaced the CPS , BCM, ECM, Re-programmed and got new keys , Replaced intake gasket, and The original symptom of Dying intermittently and Security light flashing is still there.
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Old 08-20-2019, 10:21 AM   #3
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Default Re: 2003 Saturn Vue P1629

I don't know about GM dealer services. There may be a simple reason why hardly anyone replied to this thread. Your descriptions may be too overwhelming to contemplate any comments. In addition to your dealer replacing the ecm, bcm and crank sensor, there may be less room for anyone to comment. With the intake gasket replaced and the original intermittent engine die off/security light flashing still occurring, there seems to be a large red herring about.........

Based on facts given, P1629 was read by your reader, indicating the bcm was working because the bcm is the gateway, physically connected to the OBD II port where all readers and scantools plug in to output generic error codes. If you found an intermittent failure to read error codes while the check engine light remained on, this suggests a wiring problem between bcm and OBD II port terminal. P1639 from the service manual states;
The PCM receives an incorrect fuel enable password from the BCM.

The PCM receives no password from the BCM.


GMs Passlock theft deterrent system incorporates the Passlock sensor on the ignition cylinder, bcm (Passlock program), and pcm. When the ignition switch is turned, the Passlock sensor detects cylinder rotation from Hall effect magnets and sends a discrete voltage to the bcm. If this voltage is correct, a fuel password is passed from bcm to pcm. The pcm either receives a correct password or not. A good password allows injector operation. A negative password disables injectors - the engine can crank all day until the battery dies or starter burns out but the engine will never fire up without injector operation.

I suspect the Passlock sensor may be the problem as service manual diagnostics uses GMs scantool to monitor the discrete voltage and other signals to determine where fault lies. Even wiring issues are supposed to be revealed as part of a detailed sequence of diagnostics. I'm not a GM tech nor ever worked in auto repairs but can read and understand service manuals and sometimes use the one cell between my ears.

When security flashes, Passlock was triggered into theft mode and disables injector operation. Leaving the ign switch on beyond 10 minutes resets Passlock when the security light goes from flashing to on. Cycling the ign switch off then restart should allow you to drive. The Passlock sensor assembly and wiring on the ignition switch/lock cylinder should be examined for wear or damage. When replacing a Passlock sensor assembly, ecm or bcm, a 30 minute relearn procedure is performed at home to 'marry' the new part to the other two. Dealers use their scantool to perform this relearn in 10 minutes.

Whether or not your Passlock sensor is the issue seems to be the next step in diagnosing/troubleshooting this intermittent problem. Why GM didn't diagnose possible Passlock sensor/wiring issues is anyone's guess. Replacing a Passlock sensor assembly, to my knowledge as a member here, hasn't been reported.

Last edited by fdryer; 08-20-2019 at 10:28 AM.
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