What causes GM code 80?

Low trans fluid level Worn clutch packs or band Failed shift solenoid Faulty input or output speed signal

How do I fix GM code 80?

Read codes with an ALDL scan tool Check fluid level and condition right away Road test and note which gear slips Test shift solenoids and wiring Check line pressure if gauges are available Rebuild or replace internal parts if slip is confirmed and fluid is full

80 Transmission Component Slipping

Q: What does GM code 80 mean?

GM code 80. Transmission Component Slipping. Applies to 1991-1995 C/K trucks, Suburban, Caprice, Roadmaster.

Make: GM (1982-1995)
Category: Powertrain - Transmission
Severity: Check Engine Light
Applies to: 1991-1995 C/K trucks, Suburban, Caprice, Roadmaster

How to read it

Code 80 reads as 8 flashes, pause, 0 flashes on the check-engine light. Jump terminals A and B on the ALDL connector with the key off, then turn the key on with the engine off and count the check-engine flashes.

What does GM code 80 mean?

80. Transmission Component Slipping. This code sets when your vehicle computer detects transmission component slipping.

Common causes of 80

Low trans fluid level
Worn clutch packs or band
Failed shift solenoid
Faulty input or output speed signal

How to fix 80

Read codes with an ALDL scan tool
Check fluid level and condition right away
Road test and note which gear slips
Test shift solenoids and wiring
Check line pressure if gauges are available
Rebuild or replace internal parts if slip is confirmed and fluid is full