B2798 (blink 99) on Toyota Corolla E120: COMMUNICATION MALFUNCTION NO.2

Short answer: B2798 means “COMMUNICATION MALFUNCTION NO.2”. The car’s computer has found a fault in the Engine immobiliser system. First check: workshop check order (RM821E): CHECK HARNESS AND CONNECTOR BETWEEN TRANSPONDER KEY -> CHECK TRANSPONDER KEY AMPLIFIER.

Code

B2798 · 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. Key; Transponder key amplifier; Wire harness; ECM

What to check, in order

1. Workshop check order (RM821E): CHECK HARNESS AND CONNECTOR BETWEEN TRANSPONDER KEY -> 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

• B2798 · Toyota Passo (1st gen)
• B2798 on all cars compared

← B2797/99 B0100/13 →

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.