C1277 (blink 77) on Toyota Corolla E120: Abnormal change in output voltage of right rear speed sensor

Short answer: C1277 means “Abnormal change in output voltage of right rear speed sensor”. The car’s computer has found a fault in the ABS with BA & EBD system and turns on the ABS warning. First check: inspect listed trouble area (no detail page parsed; trouble-area assignment from chart row layout).

Code

C1277 · blink 77

System

ABS with BA & EBD

Dashboard light

ABS warning

Applies to

All E120 with ABS (BA & EBD)

Confidence

high (official Toyota RM821E chart; trouble-area row alignment medium)

Source

toyotamanuals.gitlab.io

Likely causes

1. Right rear speed sensor rotor

What to check, in order

1. Inspect listed trouble area (no detail page parsed; trouble-area assignment from chart row layout)

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

• C1277 · Toyota Passo (1st gen)
• C1277 on all cars compared

← C1276/76 C1278/78 →

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.