OBD Guide
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B1602

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

B1602 is an OBD-II diagnostic trouble code meaning: PATS Received Invalid Format Of Key-Code From Ignition Key Transponder. Common causes: damaged or faulty ignition key, transponder antenna malfunction. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Engine won't start
  • The engine stalls immediately after starting
  • The immobilizer indicator is flashing
  • No response when turning the key

Causes

  • Damaged or faulty ignition key
  • Transponder antenna malfunction
  • Open or short circuit in wiring harness
  • Problems with the PATS module
  • Dead key battery (if applicable)

How to Fix

  1. Check the condition of the ignition key
  2. Check key battery voltage (if applicable)
  3. Diagnose the transponder antenna
  4. Check the integrity of the PATS system wiring harness
  5. Read fault codes in PATS module
  6. If necessary, reprogram the keys

Related codes

B1600B1601B1603

FAQ

What does the B1602 code mean?

B1602 is an OBD-II diagnostic trouble code that indicates: PATS Received Invalid Format Of Key-Code From Ignition Key Transponder

What causes a B1602 error code?

The most common causes of B1602 include: Damaged or faulty ignition key; Transponder antenna malfunction; Open or short circuit in wiring harness; Problems with the PATS module.

How do I fix a B1602 diagnostic trouble code?

To fix B1602: Check the condition of the ignition key. Check key battery voltage (if applicable). Diagnose the transponder antenna. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1602?

Yes, but get it checked soon

How much does it cost to fix B1602?

The estimated repair cost for B1602 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat