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PATS Received Invalid Format Of Key-Code From Ignition Key Transponder

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Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

Try the original manufacturer key first; if the vehicle starts, the copied key is the problem and not the system

  • BBody
  • 1Manufacturer-specific
  • 6Body
  • 02Sequence number

What does it mean?

B1602 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Left Solar Sensor Circuit High .

Symptoms

  • No start with the security lamp flashing, usually straight after a key was cloned or copied
  • The original key still starts the vehicle while the copy is rejected
  • The fault follows the key rather than the vehicle
  • Intermittent starting in cold weather or with a tired battery, and normal starting once the battery is charged
  • On the sensor variant, the climate system blows warmer than commanded in direct sunlight

Likely causes

  • Wrong transponder type fitted, such as a chip from a different system generation or an incompatible clone
  • Partially cloned or badly written key, so the data frame is incomplete
  • Interference from a second transponder or a metallic fob on the same ring corrupting the message
  • Weak read caused by a damaged, cracked or misaligned antenna ring
  • Broken or badly routed wiring between the ring and the module distorting the data signal
  • Low voltage during cranking corrupting the transmitted frame
  • Module software level not matching the key generation, common after a replacement module
  • On applications where this code refers to climate control, a solar load sensor circuit reading high from an open circuit or a short to voltage

How to fix it

  1. Try the original manufacturer key first; if the vehicle starts, the copied key is the problem and not the system
  2. Remove every other transponder from the key ring and repeat the test
  3. Check that the antenna ring is seated squarely on the lock cylinder and its connector is fully latched
  4. Measure battery voltage during cranking, since a marginal battery produces corrupted frames
  5. Inspect the ring wiring for breaks, crush damage and poor routing close to noisy circuits
  6. Erase and reprogram the keys using a chip type the module supports, following the correct procedure
  7. Replace the antenna ring or the module only after key type, wiring and voltage have all been ruled out
  8. On the sensor variant, check the sensor circuit for an open and confirm the reference voltage at the connector

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.