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.
Diagnostic Test
CHECK FOR DTC U1601-ECU APPLICATION SOFTWARE CODE 1 MISSING OR CORRUPTED
This DTC must be active for the results of this test to be valid. Check for a loose scan tool connection. Verify battery charger is installed and charge rate provides approximately 13.5 volts.
- Ignition on, engine off.
- With the scan tool, read the DTCs.
- With the scan tool, follow the reprogramming procedure and reflash the Electro-Hydraulic Power Steering (EHPS) Pump while maintaining voltage as noted above.
- With the scan tool, read the DTCs.
Does the scan tool display: U1601-00-ECU APPLICATION SOFTWARE CODE 1 MISSING OR CORRUPTED?
Yes
- Replace and program the Electro-Hydraulic Power Steering (EHPS) Pump in accordance with the Service Information. Refer to PUMP, REMOVAL .
- Perform EHPS VERIFICATION TEST. Refer to DIAGNOSIS AND TESTING .
No
- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring harness and connectors.
- Perform the EHPS VERIFICATION TEST. Refer to DIAGNOSIS AND TESTING .
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.