Skip the auto shop - Our mechanics make house calls

Q: Transmission

asked by on

When I put it in drive and am holding the break. The transmission shifts to 2 and the speedometer goes to 30 mph when my heater is on. But if I turn the heater off then it's perfectly fine. My transmission is automatic bit also have the ability to switch to manual with slap stick.

My car has an automatic transmission.

It sounds like the speedometer circuit and the shifter circuit may be shorted together. The shifter movement should have no effect on the speedometer needle. I would recommend having an electrical componenents are not working inspecton performed to locate the short in your shifter circuit. This may include the use of wiring diagrams and a digital multimeter. Consider YourMechanic for this inspection as it can be completed convieniently from your home or office.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Transmission

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: Hello! Planning to go for 2015 Chrysler 200 preowned, please advise.

Hi there. When you are wanting to purchase a vehicle that is preowned, you would want to do a few things. First do a research on a the vehicle that you want to buy and see how much it costs...

Q: Whistling sound coming from front of car while driving.

This sounds like a possible bad wheel bearing. I would enlist the help of a YourMechanic professional to check your wheel bearings with an automotive stethoscope. This will help the professional to determine where the noise is coming from. Other...

Q: Car cuts off when put in drive, doesn't go backward - 2007 Chrysler Pacifica

Hello. A common fault with your vehicle is the torque converter clutch not releasing properly. This causes stalling when shifting to Drive or Reverse. If you need someone to come to your car, a mobile expert from YourMechanic can come...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...