OBD Guide
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B2735

PASS-Key Programming Mode Active

B2735 is an OBD-II diagnostic trouble code meaning: PASS-Key Programming Mode Active. Common causes: targeted programming of a new key by the user or service, resetting bcm memory after disconnecting battery. Estimated repair cost: ~$111.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
~$111 (est.)

Symptoms

  • The engine does not start (the immobilizer blocks the start)
  • Security system indicator (lock or key) flashes or stays on
  • Code B2735 when diagnosing BCM or immobilizer module
  • Message about the need to program the key on the display

Causes

  • Targeted programming of a new key by the user or service
  • Resetting BCM Memory After Disconnecting Battery
  • Replacing the PCM, BCM or VATS module without reprogramming
  • Failure in the PASS-Key immobilizer module
  • Attempt of unauthorized opening of a car

How to Fix

  1. Read all error codes and determine the context of their occurrence
  2. If the code appears after regular programming of the key, complete the procedure according to the instructions
  3. If the code appears spontaneously, check whether the ECU or battery has been replaced
  4. Use the PASS-Key key training procedure according to the service documentation
  5. If necessary, contact an authorized dealer for programming using specialized equipment
  6. Reset code after programming is complete

Related codes

B2734B2736B3055P1630

FAQ

What does the B2735 code mean?

B2735 is an OBD-II diagnostic trouble code that indicates: PASS-Key Programming Mode Active

What causes a B2735 error code?

The most common causes of B2735 include: Targeted programming of a new key by the user or service; Resetting BCM Memory After Disconnecting Battery; Replacing the PCM, BCM or VATS module without reprogramming; Failure in the PASS-Key immobilizer module.

How do I fix a B2735 diagnostic trouble code?

To fix B2735: Read all error codes and determine the context of their occurrence. If the code appears after regular programming of the key, complete the procedure according to the instructions. If the code appears spontaneously, check whether the ECU or battery has been replaced. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2735?

Yes, but get it checked soon

How much does it cost to fix B2735?

The estimated repair cost for B2735 is ~$111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat