Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006IMPALA V6-3.5L VIN K FLEX FUELREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSCUSTOMER INTERESTENGINE CONTROLS - INTERMITTENT MIL ON/DTC P0128 SET
2006 Chevrolet Impala V6-3.5L VIN K Flex Fuel
Engine Controls - Intermittent MIL ON/DTC P0128 Set
2006 Chevrolet Impala V6-3.5L VIN K Flex FuelSECTION Engine Controls - Intermittent MIL ON/DTC P0128 Set
TECHNICAL
Bulletin No.: 08-06-04-026
Date: April 17, 2008
Subject:
Intermittent MIL/Check Engine Light On, DTC P0128 Set (Reprogram PCM)
Models:
2006 Chevrolet Impala, Monte Carlo
with 3.5L Engine (VINs K, N - RPOs LZE, LZ4)
Condition
Some customers may comment that the check engine light illuminates intermittently. Upon inspection, technicians may find DTC P0128 set.
Correction
Verify that the cooling system is filled to the proper level and using a Tech 2(R), verify that the thermostat is opening at the proper temperature. If everything is functioning properly, reprogram the PCM with a new service calibration using the TIS2WEB Service Programming System (SPS) application. As always, make sure your Tech 2(R) is updated with the latest software version.
Warranty
For vehicles repaired under warranty, use the table.
Disclaimer
Bulletin No.: 08-06-04-026
Date: April 17, 2008
Subject:
Intermittent MIL/Check Engine Light On, DTC P0128 Set (Reprogram PCM)
Models:
2006 Chevrolet Impala, Monte Carlo
with 3.5L Engine (VINs K, N - RPOs LZE, LZ4)
Condition
Some customers may comment that the check engine light illuminates intermittently. Upon inspection, technicians may find DTC P0128 set.
Correction
Verify that the cooling system is filled to the proper level and using a Tech 2(R), verify that the thermostat is opening at the proper temperature. If everything is functioning properly, reprogram the PCM with a new service calibration using the TIS2WEB Service Programming System (SPS) application. As always, make sure your Tech 2(R) is updated with the latest software version.
Warranty
For vehicles repaired under warranty, use the table.
Disclaimer
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.