What causes GM code 35?

Carbon fouled idle air control valve or throttle bore Failed IAC motor winding Vacuum leak driving idle above target speed Damaged IAC wiring or connector

How do I fix GM code 35?

Clean the throttle bore and IAC passages with approved cleaner Check for vacuum leaks with propane or smoke before replacing parts Command idle speed with a scan tool and watch for response Test IAC motor resistance per the service manual Reset idle learn after cleaning or replacement per the manual

35 IAC Problem Or Idle Error

Q: What does GM code 35 mean?

GM code 35 — IAC Problem Or Idle Error. Applies to 1982-1995 GM cars and C/K trucks, Camaro, Corvette.

Make: GM (1982-1995)
Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: 1982-1995 GM cars and C/K trucks, Camaro, Corvette

How to read it

Code 35 reads as 3 flashes, pause, 5 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 35 mean?

35 — IAC Problem Or Idle Error. This code sets when your vehicle computer detects iac problem or idle error.

Common causes of 35

Carbon fouled idle air control valve or throttle bore
Failed IAC motor winding
Vacuum leak driving idle above target speed
Damaged IAC wiring or connector

How to fix 35

Clean the throttle bore and IAC passages with approved cleaner
Check for vacuum leaks with propane or smoke before replacing parts
Command idle speed with a scan tool and watch for response
Test IAC motor resistance per the service manual
Reset idle learn after cleaning or replacement per the manual