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OBD Code B1602

PATS Received Invalid Format Key Code

CodeB1602
DescriptionPATS Received Invalid Format Key Code
Possible CausesCorrupted transponder|Module communication error
SymptomsNo start|Security system fault
SystemBody

What Does B1602 Mean?

PATS Received Invalid Format Key Code. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the body.

Code Breakdown

B = Body code

1 = Manufacturer-specific

How to Fix B1602

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Check that the correct key is being used — aftermarket keys may not have the proper transponder chip.
  2. Inspect the key transponder ring around the ignition cylinder.
  3. Check for a weak key fob battery.
  4. Try the spare key to determine if the issue is with the key or the vehicle.
  5. Check the immobilizer module and its wiring.
  6. Some vehicles require a dealer-level key relearn procedure.
  7. Clear codes and test with all available keys.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is B1602 serious?

Yes — B1602 is considered a high-severity code. You should have it diagnosed and repaired as soon as possible. Driving with this code active may cause further damage to your vehicle or pose a safety risk.

Can I clear B1602 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix B1602?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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