What causes GM code 26?

Shorted solenoid or relay on a quad driver output circuit Failed EVAP canister purge or EGR solenoid pulling the driver down Damaged wiring shorted to ground or power Internal ECM quad driver fault

How do I fix GM code 26?

Note which output device stopped working such as the purge solenoid or fan relay Disconnect output devices one at a time and recheck the code Test each solenoid and relay coil resistance against specification Inspect harness branches for shorts to ground Replace the ECM only after every output circuit tests good

26 Quad Driver Module A Error

Q: What does GM code 26 mean?

GM code 26 — Quad Driver Module A Error. Applies to 1988-1995 GM cars and C/K trucks, Camaro, Corvette.

Make: GM (1982-1995)
Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: 1988-1995 GM cars and C/K trucks, Camaro, Corvette

How to read it

Code 26 reads as 2 flashes, pause, 6 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 26 mean?

26 — Quad Driver Module A Error. This code sets when your vehicle computer detects quad driver module a error.

Common causes of 26

Shorted solenoid or relay on a quad driver output circuit
Failed EVAP canister purge or EGR solenoid pulling the driver down
Damaged wiring shorted to ground or power
Internal ECM quad driver fault

How to fix 26

Note which output device stopped working such as the purge solenoid or fan relay
Disconnect output devices one at a time and recheck the code
Test each solenoid and relay coil resistance against specification
Inspect harness branches for shorts to ground
Replace the ECM only after every output circuit tests good