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 MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 181 (PGM-FI SYSTEM)DTC TROUBLESHOOTINGDTC U0301: PGM-FI SYSTEM AND A/T SYSTEM PROGRAM VERSION MISMATCH
2008 Chevrolet HHR LT, 2.4 P, Automatic
DTC U0301: PGM-FI System And A/T System Program Version Mismatch
2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION DTC U0301: PGM-FI System And A/T System Program Version Mismatch
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- This DTC is indicated when a PCM update is not completed.
- Do not turn the ignition switch to ACC (I) or LOCK (0) while updating the PCM. If you do, the PCM can be damaged.
- Do the PCM update procedure (A/T system) (see PCM UPDATE ).
- Check for Pending or Confirmed DTCs with the HDS.
Is DTC U0301 indicated?
YES -Replace the original PCM (see PCM REPLACEMENT ).
NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
RENDER: 1.0x
NO RELATED
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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.