1991 Buick Century Code 26

1991 BUICK CENTURY

TIM1567

MEMBER
1 POST

I am getting a code 26 on my 1991 Buick century and I cannot find anything in any book that tells me what to check. I do know that it stands for quad driver. Could it be the map sensor because it dies when I put it in gear it is an automatic trans.

Mar 22, 2006 at 11:27 AM

MVANNESSJR

✓Experienced Mechanic
223 POSTS

CODE 26

Trouble Code 26 indicates that the quad-driver is malfunctioning.

QDM symptoms:

Cooling fan(s) inoperative
Poor driveability due to 100% canister purge.
Coolant light "ON" all the time, "OFF" during bulb check.
EGR inoperative - Code 32.
TCC inoperative
This problem can be caused by:
1) Short to 12 volts on the control circuit by a shorted component.

2) Faulty ECM.

Mar 22, 2006 at 1:14 PM

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Suggested Repair

Check the quad-driver control circuit for a short to 12 volts caused by a shorted component, and suspect a faulty ECM if that circuit is not shorted.

Conversation Summary

The owner of a 1991 Buick Century reported code 26, understood it as a quad-driver fault, and asked whether a MAP sensor could explain the engine dying when shifted into gear. The expert said code 26 indicates a malfunctioning quad driver and listed possible symptoms, including inoperative cooling fans, poor driveability from continuous canister purge, a coolant light staying on, inoperative EGR with code 32, and an inoperative torque converter clutch. The stated causes were a short to 12 volts on the control circuit from a shorted component or a faulty ECM.

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1991 Buick Century Code 26

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