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 U0302: PCM-FI SYSTEM AND A/T SYSTEM PROGRAM VERSION MISMATCH
2008 Chevrolet HHR LT, 2.4 P, Automatic
DTC U0302: Pcm-FI System And A/T System Program Version Mismatch
2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION DTC U0302: Pcm-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 ).
- Do not turn the ignition switch to LOCK (0) or ACCESSORY (I) while updating the PCM. If you turn the ignition switch to LOCK (0) or ACCESSORY (I) before completion, 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 U0302 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.