B1602: Invalid Key Code Format From Ign Key Transponder

DTC B1602: PATS RECEIVED INVALID KEY CODE FORMAT FROM IGNITION KEY TRANSPONDER (PARTIAL KEY READ)

B1602-1 Retrieve The DTCS
- Key OFF.
- Connect NGS to DLC.
- Retrieve and document continuous DTCs.
- Clear continuous DTCs.
Perform PATS on-demand self-test.
Is DTC B1602 retrieved?
Yes
Go to B1602-2.
No
- System is OK.
- CHECK all customer encoded ignition keys with PATS on-demand self-test to verify all other keys are programmed.

B1602-2 Replace The Encoded Ignition Key
- Key OFF.

Note: Check to make sure the customer and encoded ignition keys are approved Ford encoded PATS ignition keys. Unapproved PATS keys do not always operate properly over different temperature ranges (encoded keys from Rotunda, ILCO, Curtis, or Strattec are approved encoded ignition keys). Cut a new encoded ignition key.

- Key ON.
- Program a new encoded ignition key; refer to Key Programming Erase All Key Codes and Program Two Keys. Service and Repair
- Perform PATS on-demand self-test.
Is DTC B1602 retrieved?
Yes
Go to B1602-3.
No
- System is OK.
- If the customer has any remaining encoded keys at home, INSTRUCT them to perform Key Programming Programming a Key Using Two Programmed Keys on each remaining key. Service and Repair

B1602-3 Replace The PATS Transceiver

Note: Large metal objects on the key chain or a second PATS key on the same key chain may cause this fault code under some conditions.

- Key OFF.
- Replace the PATS transceiver. Service and Repair
- Key ON.
- Perform PATS on-demand self-test.
Are any DTCs retrieved?
Yes
REFER to PATS Module Diagnostic Trouble Code (DTC) Index. PATS Diagnostic Trouble Code (DTC) Index
No
System is OK.