Electro-Hydraulic Power Steering (EHPS)

U0401-00-IMPLAUSIBLE DATA RECEIVED FROM PCM

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Continuously with the ignition on, one valid CAN message received at least once, and no U0002-00-CAN C Bus Off Performance DTC present.

- Set Condition:
When the Electro-Hydraulic Power Steering (EHPS) Pump detects an incorrect CAN message from the Powertrain Control Module (PCM).





1. 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.

1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Cycle the ignition switch from off to on.
4. 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.

2. CHECK IF BCM CAN BUS DTCS ARE PRESENT
1. With the scan tool, read BCM DTCs.

Are there any BCM CAN BUS DTCs present?

Yes

- Perform the appropriate diagnostic procedure. Body Verification Test.

No

- Go To 3

3. CHECK IF ENGINE DTCS ARE PRESENT
1. With the scan tool, read PCM DTCs.

Are there any PCM DTCs present?

Yes

- Testing and Inspection 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. Power Steering Pump - Removal.
- Perform the EHPS Verification Test. EHPS Verification Test.