U0419

Code

Generic U — Network/User

Invalid Data Received From Steering Effort Control Module

Brand: Generic

Type: U — Network/User

Views: UK: 28 EN: 41 RU: 31

AI status

Completed

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Page language: EN

Causes

Faulty Steering Effort Control Module (SECM) or internal module software fault
Poor power or ground to the SECM (low battery, intermittent supply)
Damaged or corroded wiring, pins, or connectors between the SECM and the vehicle network
CAN/LIN bus faults (short to voltage/ground, high resistance, missing termination)
Intermittent open circuits or chafed wiring causing intermittent messages
Multiple module software/programming mismatch or calibration error after replacement

Symptoms

Steering assist degraded, reduced, or inconsistent feel
Steering-related warning lamp or master warning illuminated
Other network modules report communication or invalid data DTCs
Vehicle enters reduced functionality or limp mode for drive/steering systems
Intermittent or permanent loss of features that depend on SECM data (e.g., adaptive steering assistance)

What to check

Read all stored and pending DTCs and note freeze-frame/occurrence data
Check battery voltage (engine off and cranking) and charging system for stability
Perform visual inspection of SECM connector and harness for corrosion, bent pins, heat damage, chafing or repairs
Scan for other U-codes on CAN bus (ECM, ABS, BCM, gateway) to locate communication boundaries
Measure CAN bus idle voltages with DMM (each approx. ~2.5 V; CAN_H ~3.5 V, CAN_L ~1.5 V typical)
Check CAN bus termination resistance (approx. 60 ohms across CAN_H and CAN_L with power off)

Signal parameters

CAN bus idle voltages: CAN_H ≈ 2.5–3.5 V, CAN_L ≈ 1.5–2.5 V (vehicle dependent)
Termination resistance: ~60 Ω across CAN_H and CAN_L (with ignition off)
Typical message frequency: SECM steering effort/torque messages expected at manufacturer-defined rate (often 10–100 Hz)
Message contents: steering effort/torque field, checksum/CRC, sender ID — look for missing or out-of-range torque values
Error counters: CAN bus error frames and CRC error rate (use scope or advanced scanner)

Diagnostic algorithm

Record all current/pending U- and related codes and capture freeze-frame data.
Verify vehicle battery and charging system voltages; recharge or supply stable power if low.
Visually inspect SECM connector(s) and harness; repair any damage and ensure good pin contact.
With ignition ON, measure CAN_H and CAN_L voltages at SECM connector; compare to expected idle voltages.
With ignition OFF, measure termination resistance across CAN_H and CAN_L; confirm ~60 Ω.
Use a scan tool to monitor live SECM messages and message frequency. Note if messages are missing or contain out-of-range values.
Probe CAN signals with an oscilloscope at the SECM and at another node to compare waveform quality and timing; look for noise, reflections, or missing frames.
If wiring and bus look good, attempt a known-good SECM or bench test the suspect module if available (follow manufacturer safety and anti-theft procedures).
If module replacement or reflash is performed, verify correct software/calibration and perform any required adaptations/coding.
Clear codes and perform a road test to confirm fault does not return. If intermittent, document conditions and consider extended logging or module substitution for further isolation.

Likely causes

Loose/corroded connector at SECM or inline splice
Short or high-resistance condition on CAN_H or CAN_L near SECM
Failed SECM (internal electronics)
Battery/charging system voltage low or unstable during module communications

Fault status

⚠️ Status

Invalid data received from Steering Effort Control Module: module messages are missing, corrupted, or contain implausible steering effort/torque values on the vehicle network.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-4 hours