EPS light (code 37-01)

Hi,

This seems to be a common problem with the EPS control unit. The first thing I would suggest is to check the wiring to the control unit. Make sure nothing is loose, damaged, or corroded. If everything checks good, chances are the EPS control module has an internal fault and will need to be replaced.

Here are the actual diagnostics for this code. You'll see it is very vague.

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2008 Honda Fit L4-1.5L
DTC 37-01
Vehicle ALL Diagnostic Trouble Codes ( DTC ) Testing and Inspection Manufacturer Code Charts DTC 37-01
DTC 37-01
DTC 37-01: EPS Control Unit Internal Circuit (Step-up Circuit) (Initial diagnosis)

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF.
4. Start the engine.
5. Check for DTCs with the HDS.

Is DTC 37-01 indicated?

YES - Check for loose terminals in the EPS control unit connectors, and repair if necessary. If no poor connections are found, replace the EPS control unit.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EPS control unit.

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The EPC control unit is under the left side of the dash. If you look at pic 1 below, it shows the part and connectors to it. Make sure they are in good condition and not damaged.

I remember there was an extension of the original factory warranty regarding EPS issues to 10 years or 150K miles. You have exceeded the years. Also, it was related to other diagnostic trouble codes for the EPS.

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If you determine the control unit is bad, here are the directions for replacement. Pic 2 below correlates with these directions.

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2008 Honda Fit L4-1.5L
EPS Control Unit Removal/Installation
Vehicle Steering and Suspension Steering Power Steering Steering Control Module Service and Repair Removal and Replacement EPS Control Unit Removal/Installation
EPS CONTROL UNIT REMOVAL/INSTALLATION
EPS Control Unit Removal/Installation

1. Make sure you have the anti-theft code for the audio system.
2. Make sure the ignition switch is OFF, then disconnect the negative cable from the battery.
3. Remove the driver's dashboard undercover.
4. Remove the under-dash fuse/relay box).
5. Disconnect EPS control unit connector A (2P), connector B (2P), connector C (2P), and connector D (28P).

See pic 2

6. Remove the nuts (E) from the EPS control unit (F).
7. Remove the EPS control unit.
8. Install the EPS control unit in the reverse order of removal.

NOTE: The EPS control unit has three 2P connectors; make sure they are correctly reconnected. The locations of the three 2P connectors are the top: connector C (RED, WHT/RED wires), the middle: connector B (GRN wire), the lower: connector A (BLK, WHT/BLU wires).

9. Reconnect the negative cable to the battery, and do the following items:
Enter the anti-theft code for the audio system.
Set the clock.
If the EPS control unit is replaced, the EPS control unit must memorize the torque sensor neutral position.

10. After installation, start the engine, allow it to idle, and turn the steering wheel from lock-to-lock several times. Check that the EPS indicator does not come on.

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I hope this helps. Let me know if you have other questions. Also, if possible let me know what you find.

Take care and God Bless,

Joe