B2797 (blink 99) on Toyota Corolla E120: COMMUNICATION MALFUNCTION NO.1

Short answer: B2797 means “COMMUNICATION MALFUNCTION NO.1”. The car’s computer has found a fault in the Engine immobiliser system. First check: workshop check order (RM821E): CHECK NOISE -> CHECK TRANSPONDER KEY AMPLIFIER.

Code

B2797 · blink 99

System

Engine immobiliser

Dashboard light

Security indicator light (symptom); check RM 05-818 for read method

Applies to

Cars with engine immobiliser

Confidence

high (official Toyota RM821E)

Source

toyotamanuals.gitlab.io

Symptoms and when it is set

1. Communication error

Likely causes

1. Transponder key amplifier; Unregistered key inserted before; Wire harness; ECM

What to check, in order

1. Workshop check order (RM821E): CHECK NOISE -> CHECK TRANSPONDER KEY AMPLIFIER

Related on this car

• All fault codes for this car
• Warning lights
• Where the parts are (parts map)
• Common problems

Same code on other cars

• B2797 · Toyota Passo (1st gen)
• B2797 on all cars compared

← B2796/99 B2798/99 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.