Corroded, loose, or damaged connectors at the rear power steering control module or its harness.; A failing rear power steering control module that intermittently drops off the network.; CAN bus wiring damage such as chafed insulation, open circuits, or short-to-ground on the data lines.; Low or unstable battery voltage causing modules to reset or transmit invalid data frames.; A software or calibration issue in the rear power steering module requiring a flash update.; A faulty detecting module that misinterprets valid data from the rear steering module.; Water intrusion or heat damage affecting the rear steering module's internal electronics.

DTC codes / U04xx · Invalid data received from a module / U0435

U0435Invalid Data Received From Power Steering Control Module - Rear

U0435 indicates that a control module on the vehicle's controller area network (CAN) bus has received invalid or missing data from the rear power steering control module. The detecting module sets this code when the expected steering data messages are absent, corrupted, or outside the acceptable range for a calibrated period, which points to a communication or module fault rather than a mechanical steering failure.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaInvalid data received from a module

Symptoms you may notice

A steering warning light or stability control warning light illuminated on the dashboard.
Often no symptoms besides the warning light, with steering assist feeling normal.
Intermittent or reduced power steering assist, especially at low speeds or during parking maneuvers.
A stored code in one or more modules with no drivability complaint reported by the driver.
Other network-related codes present in modules that share the same CAN bus segment.

Common causes, most likely first

Corroded, loose, or damaged connectors at the rear power steering control module or its harness.
A failing rear power steering control module that intermittently drops off the network.
CAN bus wiring damage such as chafed insulation, open circuits, or short-to-ground on the data lines.
Low or unstable battery voltage causing modules to reset or transmit invalid data frames.
A software or calibration issue in the rear power steering module requiring a flash update.
A faulty detecting module that misinterprets valid data from the rear steering module.
Water intrusion or heat damage affecting the rear steering module's internal electronics.

How to diagnose and fix it

Perform a full scan of all modules and record every stored and pending code to establish the network fault pattern.
Inspect and clean the rear power steering control module connectors and harness for corrosion, pin tension, and water intrusion.
Test battery voltage and charging system output, then clear codes and verify whether U0435 returns under load.
Check CAN bus continuity and resistance at the rear steering module connector against manufacturer specifications.
If wiring and power are good, substitute a known-good rear power steering module or perform a module communication self-test.
Reprogram or update the rear power steering module software if a calibration bulletin applies to the vehicle.
After repair, clear all codes, perform a road test with steering maneuvers, and confirm no codes return.

Why U0435 is often a wiring fault

A rear power steering module that sets U0435 may still provide full assist, so technicians who only road-test the car can miss the fault entirely.
The code is stored by the module that expected the data, not necessarily by the rear steering module itself, so the fault may live in a different module's connector.
Low battery voltage during cranking is a common trigger because modules that brown out can transmit invalid frames without setting a low-voltage code.
A single chafed CAN wire near the rear axle or underbody can set U0435 along with unrelated network codes, leading to misdiagnosis of the steering module.
Aftermarket accessories wired into the CAN bus or power circuits can corrupt data frames and cause this code without any hardware failure.

Can I keep driving with U0435?

The vehicle is generally safe to drive if steering assist remains normal, but avoid high-speed maneuvers and long trips until the fault is diagnosed. If steering assist becomes intermittent or the warning light flashes, stop driving and have the vehicle towed to prevent loss of control.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.