20 Most Recent 2004 Buick Regal Questions & Answers

Did you change crankshaft sensor and cam sensor?

2004 Buick Regal | Answered on Dec 28, 2017

You need to take it to a qualified repair shop that has a factory or professional type scan tool an have all the computers on the vehicle checked . Check for DTC'S - diagnostic trouble codes ,module data etc.

2004 Buick Regal | Answered on Dec 06, 2017

It's probably a bad internal mode switch . The sensor is input to the PCM - engine computer .
The lever assembly-manual shaft detent with internal mode switch (IMS) is a sliding contact electrical switch assembly that corresponds to the PRNDL position selected. Each of the PRNDL positions has a unique ground pattern on four wires from the PCM.
The assembly consists of two major components:
• The internal mode switch that consists of:
- The housing (1), which makes up the stationary contacts.
- The insulator (2), which makes up the moving contacts and is secured on the detent lever (4).
• The lever assembly which consists of:
- The manual shaft (3)
- The detent lever (4)
The range detection is accomplished by securing the moving contacts to the detent lever. When the driver selects a PRNDL position, the detent lever inside the transmission rotates. This rotates the insulator which in turn grounds the four wires in a unique pattern for each gear selection, corresponding to the PRNDL position selected. The IMS is electrically connected by five wires (four of which the PCM supplies voltage to and one wire that is a common ground) to the transmission pass through connector.

Range Selector Displays Incorrect Range

The transmission internal mode switch (IMS) is a sliding contact switch attached to the selector detent inside the transmission side cover. The four inputs to the PCM indicate the position of the transmission range selector. The input voltage level at the PCM is high, B+, when the IMS is open and low when the switch is closed to ground. The four input parameters represented are Signals A, B, C and P, Parity. Refer to Transmission Internal Mode Switch Logic .
Install a scan tool.
Turn ON the ignition, with the engine OFF.
Select IMS on the scan tool.
Place the range selector in each transmission range: P, R, N, D4, D3, D2 and D1.
Does each range selected match the scan tool IMS display?
Go to Powertrain Control Module Replacement in Engine Controls - 3.1L or Intermittent Conditions in Engine Controls - 3.8L
Go to Step 2
Select IMS A/B/C/P on the scan tool.
Place the range selector in each transmission range: P, R, N, D4, D3, D2 and D1.
Does the IMS A/B/C/P display the specified values for each range?
Go to Step 12
Go to Step 3

Your best bet , take it to a qualified repair shop !

2004 Buick Regal | Answered on May 12, 2017

Its in the gas tank.

2004 Buick Regal | Answered on Apr 12, 2016

low coolant level, air in system or leak, or bad thermostat can cause no heat issues, unless you mean your fan blower does not work, then you should repost question.

2004 Buick Regal | Answered on Feb 17, 2016

Carlos, No vacuum line to washers, the rubber hoses look just like a lot of vacuum lines and could be mistaken.
error code P0155 is Heated Oxygen Sensor fault, Heater Circuit Bank 2 Sensor 1.
Around 98% of the time, you can assume correctly,without any specific testing, that a new O2 sensor is in order and will solve the problem.
press the helpful button and follow me on fixya for more tips and info.

How to Replace Oxygen O2 Sensors On Your Car


What that Service Engine Soon or Check engine scary light means DTC Error...


2004 Buick Regal | Answered on Feb 10, 2016

Don't be leave there is They have an electric pump to pump the fluid from the tank It should be located on or close to the tank

2004 Buick Regal | Answered on Feb 10, 2016

Remove Passenger wheel (front) in wheel well you should be able to see bottom parts of oil filter

2004 Buick Regal | Answered on Feb 10, 2016

Without knowing the engine specification, I would check the fusible links at the starter solenoid and have your alternator tested for a shorted rectifier bridge

2004 Buick Regal | Answered on May 17, 2015

Dash lights flickering can be caused by a bad ground and loose connection, clean up the posts on the battery. I had this same thing and that fixed it.

2004 Buick Regal | Answered on May 13, 2015

The odds that both bulbs failed is like my cozens slim and none. There is a fuse that could have failed or possibly the light switch. eliminate those problems check to see if you have voltage at the bulb. If so it is either the bulb or ground connection.

2004 Buick Regal | Answered on Apr 03, 2015

is the noise a high pitch noise. if it is then converter is slipping and needs to be replaced.

2004 Buick Regal | Answered on Jan 01, 2015

I need a little more info like no blower speeds or just nothing from control head please

2004 Buick Regal | Answered on Dec 23, 2014

Remove the battery cables. Charge the battery. Reattach the cables. Start the car. Drive to repair shop.

2004 Buick Regal | Answered on Nov 19, 2014

security system could be doing this. does your ignition key have the integrated buttons to unlock/lock the doors. do you have 2 keys.

Try the second key. If that does not work replace the batteries in both the keys. get the batteries first and before you open the key up.
Once open replace the battery quickly and correct side up.

2004 Buick Regal | Answered on Oct 14, 2014

Check bulbs fuse could be something shifter switch but that's along shot check the obvious first

2004 Buick Regal | Answered on Aug 17, 2014

Check your fluid levels. It may need something as simple as a service i.e. fluid and filter. Or it may need replacement. If the fluid and filter are good you might try an additive.

2004 Buick Regal | Answered on Apr 12, 2014

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