codes 23,44 and 64 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-06-2007, 12:11 AM   #1
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car runs fine,but check engine light is,i understand code 23,but not sure about the 44 and 64
any thoughts
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Old 05-06-2007, 12:19 AM   #2
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From Techinfo at the top of the page....


Codes.. for 1988-91 Vin # C bonnevilles
12 - Diagnostic Mode
13 - Oxygen Sensor Circuit( Open Circuit )
14 - Coolant Temperature Sensor Circuit( High Temperature Indicated )
15 - Coolant Temperature Sensor Circuit ( Low Temperature Indicated )
16 - System High Voltage
21 - Throttle Position Sensor Circuit ( Signal Voltage High )
22 - Throttle Position Sensor Circuit ( Signal Voltage Low )
23 - Intake Air Temperature Sensor Circuit ( Low Temperature Indicated )
24 - Vehicle Speed Sensor Circuit
25 - Intake Air Temperature Sensor Circuit ( High Temperature Indicated )
26 - Quad Driver Circuit
27 - Gear Switch Diagnosis( Second Gear Switch )
28 - Gear Switch Diagnosis ( Third Gear Switch )
29 - Gear Switch Diagnosis ( Fourth Gear Switch )
31 - Park/Neutral Switch Circuit
34 - Mass Air Flow Sensor Circuit ( Grams Per Second / Low )
38 - Brake Input Circuit
39 - Torque Converter Clutch Circuit
41 - Cam Sensor Circuit
42 - Electronic Spark Timming Circuit
43 - Electronic Spark Control Circuit
44 - System Lean
45 - System Rich
46 - Power Steering Pressure Switch Circuit
48 - Misfire Diagnosis
51 - MEM-CAL ERROR ( Faulty or Incorrect MEM-CAL )
63,64,65 - Exahust Gas Recirculation Flow Check

Only helpful advice I can offer is, our cars of this vintage are starting to age. Start with cleaning the battery cable connections. Loose/corroded connections are starting to become common. Maybe a gearhead will chime in with something more. Good Luck!
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Old 05-06-2007, 01:14 PM   #3
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we just finished swaping in a new motor,i went with a cold air intake,and havent hooked up the sensor that go'* to it(waiting on it to arrive) or the vac line,would that cus the lean condition?
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Old 05-06-2007, 01:18 PM   #4
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Vacuum leaks are the #1 cause of lean.

And what sensor? What vacuum line?
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Old 05-06-2007, 01:59 PM   #5
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the 1'* on the air inlet,before the throttle body,not sure where the hose went to,
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Old 05-06-2007, 02:10 PM   #6
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Which Motor do you have?

3.8 or 3800?

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Old 05-06-2007, 02:11 PM   #7
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guess that might help..3800 car is a 89, i believe
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Old 05-08-2007, 12:45 PM   #8
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found out its the senor that gos to the air box,what id like to know,would that cause the lean condition
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Old 05-08-2007, 01:21 PM   #9
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1. You know it isn't running correctly, if it'* throwing codes, something'* wrong
2. You know there is at least one sensor and at least one vacuum line disconnected
3. Hook it all up correctly and then see what you've got
4. Take pictures of problem areas and post them so we can tell what you're talking about
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Old 05-12-2007, 12:05 PM   #10
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got everything thing fixed,reset the computer,went for a drive,and recheck codes,and only thing that come up is code 44,which i know means system lean,thought it might have been the fuel pump,but got that changed yesterday, any ideas
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