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 MANUALSJEEP2014GRAND CHEROKEE LAREDO, AWDREPAIR AND DIAGNOSISSTEERINGELECTRONIC STEERINGELECTRO-HYDRAULIC POWER STEERING (EHPS) MODULE - ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGU0401-00-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCMDIAGNOSTIC TEST
2014 Jeep Grand Cherokee Laredo, AWD
Diagnostic Test
2014 Jeep Grand Cherokee Laredo, AWDSECTION Diagnostic Test
- CHECK FOR DTC U0401-00-IMPLAUSIBLE DATA RECEIVED FROM PCM NOTE:
This DTC must be active for the results of this test to be valid.
- Turn the ignition on.
- With the scan tool, record and erase DTCs.
- Cycle the ignition switch from off to on.
- With the scan tool, read DTCs.
Does the scan tool display: U0401-00-IMPLAUSIBLE DATA RECEIVED FROM PCM?
Yes
- Go To 2
No
- Test complete. The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- CHECK IF BCM CAN BUS DTCS ARE PRESENT
- With the scan tool, read BCM DTCs.
Are there any BCM CAN BUS DTCs present?
Yes
- Perform the appropriate diagnostic procedure. Refer to STANDARD PROCEDURE .
No
- Go To 3
- With the scan tool, read BCM DTCs.
- CHECK IF ENGINE DTCS ARE PRESENT
- With the scan tool, read PCM DTCs.
Are there any PCM DTCs present?
Yes
- Refer to DTC INDEX and perform the appropriate diagnostic procedure.
No
- Using the schematics as a guide, check the Electro-Hydraulic Power Steering Module pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the Electro-Hydraulic Power Steering (EHPS) Pump in accordance with the Service Information. Refer to PUMP, REMOVAL .
- Perform the EHPS Verification Test. Refer to STANDARD PROCEDURE .
- With the scan tool, read PCM DTCs.
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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.