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HOMESERVICE MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 200 (TIRE PRESSURE MONITORING SYSTEM)DTC TROUBLESHOOTINGDTC 85: F-CAN COMMUNICATION FAILURE
2008 Chevrolet HHR LT, 2.4 P, Automatic

DTC 85: F-CAN Communication Failure

2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION DTC 85: F-CAN Communication Failure
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: Check the fuel and emission systems DTCs with the HDS, and troubleshoot the PCM and F-CAN communication errors first (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Turn the ignition switch to LOCK (0), then turn the ignition switch to ON (II) again.
  4. Wait about 5 seconds.
  5. Check for DTCs with the HDS.

    Is DTC 85 indicated? 

    YES  -Go to step 6.

    NO  -The system is OK at this time. Check for loose terminals and poor connections at the TPMS control unit.

  6. Test-drive the vehicle.

    Does the speedometer work? 

    YES  -Go to step  10.

    NO  -Go to step 7.

  7. Turn the ignition switch to LOCK (0).
  8. Disconnect the TPMS control unit 20P connector.
  9. Test-drive the vehicle.

    Does the speedometer work? 

    YES  -Check for loose terminals and poor connections at the TPMS control unit. If necessary, substitute a known-good TPMS control unit (see TPMS CONTROL UNIT REPLACEMENT  ), and recheck.

    NO  -Turn the ignition switch to LOCK (0), and reconnect all connectors, then check and troubleshoot the fuel and emissions systems (see GENERAL TROUBLESHOOTING INFORMATION ).

  10. Turn the ignition switch to LOCK (0).
  11. Short the SCS line with the HDS.
  12. Disconnect PCM connector A (44P).
  13. Disconnect the TPMS control unit 20P connector.
  14. Check for continuity between the TPMS control unit 20P connector terminals and the PCM connector A (44P) terminals individually (see table).
    TPMS CONTROL UNIT CONNECTOR CHART

    Terminal Name TPMS Control Unit 20P Connector Terminal PCM Connector A (44P) Terminal
    CANL No. 11 No. 37
    CANH No. 2 No. 36
    Fig 1: Checking Continuity Between TPMS Control Unit 20P Connector Terminals And PCM Connector A (44P) Terminals
    G06430667Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Check for loose terminals and poor connections at the TPMS control unit and G502. If necessary, substitute a known-good TPMS control unit (see TPMS CONTROL UNIT REPLACEMENT  ), and recheck.

    NO  -Repair an open in the wire between the TPMS control unit and the PCM.

RENDER: 1.0x

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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.