Q: How do I bypass the PAT system? Or how do I bypass the anti-theft command controlled by the PCM?

asked by on

My theft light comes on rapidly and when I turn the key, my car cranks continuously but doesn't start. We believe this problem to be controlled by PATS, in which the system doesn't allow the car to fully start. We've tried resetting the system, and disconnecting the battery terminals. The PATS is controlled by the PCM. We need to know how to bypass the pats or the pcm.

My car has 105000 miles.
My car has an automatic transmission.

The PATS system cannot be bypassed. You are required to have a coded PATS ignition key in order for the computer to turn on the spark and fuel to the engine. If you do not have a PATS programmed key then only a dealer has the specialized scanner to reprogram the system to a new set of keys.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. How do I bypass the PAT system? Or how do I bypass the anti-theft command controlled by the PCM?

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: question

The security system warning light should not illuminate once the vehicle is started and you are driving. If the light does illuminate, that means there is a malfunction in the security system. Obviously, if this problem started immediately after you...

Q: Lights come on and minivan turns off

It sounds like a bad electrical connection is causing a loss of power somewhere. It can be very challenging to catch when it occurs so intermittently. Check the basics first. Test to verify a known good battery charged to at...

Q: Battery died, jumped it, wouldn't start unless gas was pressed. Once gas was released, engine died.

It sounds like there may be a couple of possibilities here. If the battery died, this may have been a result of leaving the keys on or it may have been a result of the alternator or voltage regulator failing...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.