Buick Cars & Trucks - Page 5 - Recent Questions, Troubleshooting & Support

I have a 94 Roadmaster and occasionally my pass key light comes on and car won't start....however if you turn off the key and wait 3 minutes you can try starting it again. Sometimes it will start

1993 Buick... | Answered on Nov 14, 2019


1998 Buick... | Answered on Nov 10, 2019

First thoughts is to check the voltage at the wiper motor. It the motor has power, the motor probably has failed. If there is no power at the motor, look for a short or some connection has come loose.

2004 Buick... | Answered on Nov 07, 2019

it is a safety requirement that the cap has to pushed down to allow it to turn
have you tried that process

Buick Cars &... | Answered on Nov 06, 2019

You can but you will keep setting codes and what is exactly the problem your having

2004 Buick... | Answered on Nov 05, 2019

First why are you adding it are you overheating? Just a question here for a regular coolant change after you add it you must run the engine to circulate it but when drain it if you didn't drain the engine also there's still fluid in there and that's why only a little bit did you remove the coolant bottle cap when draining it ? Also you obviously had the car jacked up so this raises the engine on an angle keeping a lot of fluid in and you need to remove the lower hose for it to come out on level ground

Buick Cars &... | Answered on Nov 05, 2019

Engine misfire can be caused by a lot of things, such as lack of spark, low compression, poor fuel quality, metering, unmetered air entering the engine, etc., which leads to lack of combustion. When this happens, the computer triggers the Check Engine light and shows a code such as P0305.

I would start with the plugs and wires, then the coil. If it persists, further expert analysis would seem to be needed.

Buick Cars &... | Answered on Nov 03, 2019

my 2012 Buick enclave sputtered at 30 mpg and again at 60 mpg why is that

2011 Buick... | Answered on Nov 03, 2019

That can be a tough one to diagnose. I suspect they are not the only items in the car not immediately getting power, which suggests an intermittent problem with a master fuse or relay. If I were you, I would start by getting ahold of the circuit diagrams for the car (try Alldatadiy.com) and trace back the circuits from the brake and dashboard lights to where they reach a common fuse or relay and check those.

2000 Buick... | Answered on Nov 03, 2019

The ECM in those years had removable Proms and did not need flashing as new ones do . Some relearning is performed as the vehicle is driven . What quirks are you having ?

Buick Cars &... | Answered on Oct 31, 2019

It is built into a thermostat housing and is located under the throttle body. Just follow the upper hose and the hoses that go to the heater core. You can remove it without taking the exhaust crossover pipe off, but it makes it much easier if you do.

2009 Buick... | Answered on Oct 31, 2019

Any DTC'S - diagnostic trouble codes stored in any module ? PCM/ECM , BCM , TCM etc..... That would be the first diagnostic step - hook up a factory or some other type of professional scan tool . We don't guess , we test . Then we read service information on how it works . Or suppose to work . Backup Lamps The CHMSL/BKUP fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the body control module (BCM). When the driver places the gear selector in to the REVERSE position, the powertrain control module (PCM) sends a class 2 message to the BCM. The BCM then applies battery positive voltage to the backup lamp supply voltage circuit. The left backup lamp is grounded at G301 and the right backup lamp is grounded at G302.
DTC B2545 Backup Lamps Circuit
DTC B2545 is set either when the backup lamps supply voltage circuit is shorted to ground or opened, or if the CHMSL/Bkup fused voltage supply circuit to the BCM is shorted to ground or opened.
If no DTC'S are set ,then go to diagnostic flow chart . Backup Lamps Always On
Schematic Reference: Exterior Lights Schematics
Connector End View Reference: Master Electrical Component List in Wiring Systems
Did you perform the Diagnostic System Check - Vehicle?
Go to Step 2
Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
Place the gear selector to the PARK position.
Are the backup lamps OFF?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3
Disconnect the body control module (BCM) connector C2.
Are the backup lamps illuminated?
Go to Step 4
Go to Step 5
Repair a short to battery positive voltage in the backup lamps supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 6
Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Go to Step 6
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 3

Buick Cars &... | Answered on Oct 31, 2019

You can remove the back seat, and it should give you enough room to pull the inner door panel off..

Buick Cars &... | Answered on Oct 28, 2019

On the steering wheel

Buick Cars &... | Answered on Oct 28, 2019

Check wiring. The main battery cable at starter as well as the line going to the battery fuse box at starter is likely lose or has defective terminal end.

Buick Cars &... | Answered on Oct 27, 2019

The chance of the Power Train Control Module (PCM) failing is very small, about 3% per industry research, so expert ndguy2481 is giving bad advice, it is more likely the crankshaft position sensor or the ignition module have a problem when they warm up. Run a test on the PCM to retrieve the trouble codes, I know there will be some. The connector to do this test is under the dash below the steering wheel under the dash panel.

1994 Buick... | Answered on Oct 26, 2019

Not finding what you are looking for?
Buick Logo

51,960 questions posted

Ask a Question

Usually answered in minutes!

Popular Products

2000 Buick LeSabre
2000 Buick LeSabre

1,705 Questions

1997 Buick LeSabre
1997 Buick LeSabre

1,573 Questions

1995 Buick LeSabre
1995 Buick LeSabre

1,066 Questions

2002 Buick Rendezvous
2002 Buick Rendezvous

1,068 Questions

1994 Buick LeSabre
1994 Buick LeSabre

891 Questions

Top Buick Experts


Level 3 Expert

85223 Answers

Jonah Oneal

Level 3 Expert

14092 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

Are you a Buick Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides