Q: Changed battery now won't start

asked by on

Hi there. I have a 2002 Buick rendezvous. I changed out battery today and now it won't start. All lights come on, but won't crank. Idk if it's the passkeylll or something else. I checked any fuse that may cause it.

My car has 999999 miles.
My car has an automatic transmission.

If prior to changing the battery you had no problems, obviously the immobilizer system is a suspect. Confirm that the engine immobilizer system (security system) is not activated thus preventing the car from starting. If the immobilizer system is on, you may see a security warning light. If the warning light is on, to temporarily override the immobilizer system, see these instructions.


New batteries are not necessarily fully charged so check battery voltage. Check to see if there are any stored diagnostic trouble codes. If you have checked the battery, there are no codes, and the immobilizer system is off, the procedure is to test for power and voltage drops to the starter motor/solenoid. If there is no power, or a large voltage drop is measured, then the electrical circuit supplying the starter motor has a fault. The circuit that will have to be tested begins at the battery and includes grounds, wiring (some of which is very heavy cabling), fuses, relays, the ignition switch, neutral start switch, and terminations. Basically, with a fully charged battery, and with the key held in the "start" position, the starter is either getting power or it isn’t. With the key in the "start" position, if the starter motor is getting power but the starter doesn’t work, then the starter is condemned and replaced. Note that starters can and sometimes do develop intermittent faults due to bad spots on the armature. If you want the foregoing diagnostic steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a no start diagnostic and the responding certified mechanic will get this taken care of for you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Changed battery now won't start

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Test question - ignore

test - ignore

Q: engine on buick rendezvous is making squealing noise...was told may be a belt....was low on transmission fluid....could the two be

The belt squeals due to a loose or weak tensioner or one of the components that is driven by the belt. You should have the belt tension checked and then inspect the belt for damage and glaze indication of component...

Q: My car does not idle until it is warm. Can you tell me what's wrong?

Hi there. Check the engine for any vacuum leaks and see if all the sensors are plugged in. Take a vacuum gauge and put it on a vacuum line to the manifold. Check to see if the engine has 17...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.