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.
DTC P1574 (68): Battery Module Temperature Signal Circuit Malfunction
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- If the IPU module fan duct is blocked, DTC P1574 (68) may be detected.
- If the DTC cannot be cleared, do the troubleshooting for DTC U1204 (55).
- Turn the ignition switch to ON (II).
- Clear the DTC with the HDS (see DTC CLEAR ).
- Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0A9D (49), P0A9E (50), P0AC7 (51), P0AC8 (52), P0ACC (53), or P0ACD (54) indicated?
YES -Go to the indicated DTC's troubleshooting.
NO -go to step 4.
- Do the IPU MODULE FAN DRIVE in the INSPECTION MENU with the HDS.
- Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1448 (63) indicated?
YES -Do the troubleshooting for DTC P1448 (63) (see DTC P1448 (63): INTELLIGENT POWER UNIT (IPU) MODULE FAN PROBLEM ).
NO -go to step 6.
- Start the engine.
- Check IMA BATTERY TEMPERATURE SENSOR 1, IMA BATTERY TEMPERATURE SENSOR 2, and IMA BATTERY TEMPERATURE SENSOR 3 in the DATA LIST with the HDS.NOTE: If the vehicle is left in a place where air temperature is 5 °F (-15 °C) or less for a long time, leave it in doors for one night at 32 °F (0 °C) or more.
Are any of the values more than 131 °F(55 °C), or less than 3.6 °F (-15.8 °C) indicated?
YES -Replace the battery module (see BATTERY MODULE REMOVAL/INSTALLATION ), then go to step 9.
NO -go to step 8.
- Check the IPU module air duct and the IPU module fan for disconnections, damage, or obstructions.
Are the IPU module air duct and the IPU module fan OK?
YES -Intermittent failure, the system is OK at this time.
NO -Repair the IPU module air duct or the IPU module fan as needed, then go to step 9.
- Turn the ignition switch to ON (II).
- Clear the DTC with the HDS (see DTC CLEAR ).
- Check for Pending or Confirmed DTCs with the HDS.
Is DTC P1574 (68) indicated?
YES -go to step 1.
NO -go to step 12.
- Start the engine.
- Check the SOC in the DATA LIST with the HDS.
- Hold the engine speed between 3,500 and 4,000 rpm without load (in P or N) until the SOC increases to the maximum.
- Monitor the OBD STATUS for DTC P1574 (68) in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 11, go to the indicated DTC's troubleshooting.
NO -If the screen indicates FAILED, go to step 1. If the screen indicates NOT COMPLETED, keep the ignition switch ON (II) until a result comes on.
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.