U0407 – Invalid Data Received From Glow Plug Control Module

U0407 is a U‑class SAE diagnostic trouble code that indicates a powertrain network message was received but judged invalid or implausible by the receiving control module. Under SAE J2012 classifications this is a network communication-type failure rather than a guaranteed hardware defect; the same code can mean different module-to-module message problems depending on vehicle architecture. You should treat U0407 as a symptom: a controller detected bad or unexpected data from another module on the vehicle network. Confirm by measuring signals, checking wiring/connectors, and verifying power, grounds, and bus integrity before replacing modules.

What Does U0407 Mean?

SAE J2012 defines the DTC format and provides standardized descriptions; the SAE J2012-DA digital annex publishes many base definitions used across manufacturers. U0407, shown here without a hyphen suffix, is a generic network-level code indicating an invalid or implausible powertrain message was received by a control unit. If the code on your scanner included a hyphen suffix (a Failure Type Byte or FTB), that suffix would narrow the subtype or failure-mode; for example an FTB can indicate timing, checksum, or value-range issues as the sub-failure.

No single universal component-level definition exists for U0407—interpretation varies by make, model, and year. The distinct failure condition is a received data message that fails plausibility or validation checks at the receiver, not simply a loss of communication. In practice this means the receiving ECU reported data content the software could not accept as valid rather than a simple open‑bus timeout.

Quick Reference

• Type: Network communication / message plausibility fault
• Primary area: Powertrain network messages (CAN/LIN segments may vary)
• Impact: Possible limp behavior, reduced features, or MIL illumination depending on message role
• Initial checks: Scan tool freeze-frame, Mode 06, bus load, and last‑message timestamps
• Common tests: Power/ground, connector integrity, wiring continuity, and CAN/LIN differential voltage
• Diagnostic approach: Test-driven — verify wiring and signals before suspecting module internals

Real-World Example / Field Notes

Technicians often see U0407 when a powertrain control module receives a parameter that fails its internal plausibility limits — for example an RPM or torque request value outside expected range. On modern vehicles this commonly occurs after intermittent connectors, aftermarket modules, or damaged harnesses introduce bit errors or shifted message timing. A frequent workshop scenario: a vehicle with recent body harness work reports U0407 and a related subsystem under‑performance; inspecting the connector and re‑seating shielded CAN pairs often clears the issue temporarily.

Another common field note: U0407 can be logged during battery disconnect or module replacement if parameter initialization or network negotiation produces transient invalid messages. In those cases the fault may be historical and not present with the engine running; confirm with live data, repeating the event, and checking for correlated power or ground faults before condemning a control module as the root cause. Always frame components mentioned here as commonly associated, not definitive, and verify with targeted electrical/network tests.

Symptoms of U0407

• Warning Lamp Anti-lock Braking System (ABS) or stability control lamp illuminated on the dash.
• Loss of Function Intermittent reduced or disabled ABS/Traction control interventions during braking or low-traction events.
• Erratic Readings Inconsistent or implausible wheel speed or brake pressure values visible on a scan tool live-data stream.
• Communication Reduced or missing CAN (Controller Area Network) messages from a expected module when monitored with a bus tool.
• Freeze/Slip Vehicle stability control behaving unpredictably or entering a limp-like mode under braking.

Common Causes of U0407

Most Common Causes

Common causes are related to network message validity rather than a single universal failed part. Frequently this code is associated with wiring or connector faults on the chassis network, intermittent power or ground to the Anti-lock Braking System (ABS) or related control module, or corrupted/absent CAN messages. A faulty sensor producing implausible data can also trigger the message on some vehicles. Interpretation varies by make/model/year; confirm with electrical and network testing.

Less Common Causes

Less commonly the cause is internal processing or input-stage issues inside a control module, failed termination resistors on the CAN bus, or software mismatch requiring calibration/programming. These are only likely after thorough external verification of wiring, power/ground, and bus integrity.

Diagnosis: Step-by-Step Guide

Tools: OBD-II scan tool with live data and CAN bus view, CAN bus analyzer or breakout box, Digital Multimeter (DMM), lab-grade oscilloscope (scope), wiring diagrams/service information, backprobe pins and insulated test leads, wiggle probe or vehicle-specific connector adapter, insulated hand tools.

1. Record the code and freeze-frame with a scan tool. Note if the code includes a hyphened FTB (Failure Type Byte). If no FTB is present, record that the code is base U0407 without subtype.
2. Check live-data for plausibility. Compare ABS-related values (wheel speed, brake pressure) against vehicle motion and other sensors to spot impossible values.
3. Use a CAN bus analyzer or breakout box to verify the expected messages are present on the bus and to capture message IDs and timing. Look for missing messages or corrupted payloads.
4. Measure CAN high/low idle voltages at the module connector with a DMM and observe differential waveform with a scope to detect noise, reflections, or low amplitude signaling.
5. Inspect and tug wiring harnesses, seals, and connectors for corrosion, bent pins, or water ingress. Perform a wiggle test while monitoring live data for intermittent message loss.
6. Verify power and ground at the suspected module connector(s) under key-on and while cranking. Confirm voltages remain within spec and grounds show low resistance to chassis.
7. Check bus termination resistance across CAN high to CAN low with the ignition off. Incorrect termination indicates bus topology or connector issues.
8. Swap-in or compare live-data with a known-good module only after wiring, power/ground, and bus checks pass. If swapping is performed, clear codes and re-test to confirm whether the fault follows the module.
9. If intermittent, capture a CAN log during the fault condition or on a short test drive to correlate events with vehicle activity or environmental factors.
10. When all external checks pass and plausibility/data integrity still fails, consider a possible internal processing or input-stage issue in the module and consult OEM technical resources for next steps.

Professional tip: Always capture a time-stamped CAN log and freeze-frame before clearing codes. Compare the suspect vehicle’s message timing and payload to a known-good unit or to factory data. This evidence-driven approach prevents unnecessary module replacement and pinpoints wiring or message-level faults quickly.

Possible Fixes & Repair Costs

Low-cost fixes typically address wiring or connector problems that cause invalid or corrupted steering-angle messages on the network. These repairs are justified when continuity, voltage, or connector inspection shows corrosion, loose pins, or intermittent contact. Mid-range fixes generally cover replacement of the steering angle sensor or its interface harness after bench or in‑vehicle plausibility tests show the sensor output is out of expected range. High-cost outcomes involve replacement or reprogramming of a control module only after all wiring, power, ground, and message-bus tests confirm external inputs are good, indicating a possible internal processing or input-stage issue.

Cost ranges (typical U.S. private repair market):

• Low: $50–$200 — connector cleaning, terminal repair, wiring splice or short repair. Justified by failed continuity or visible damage on inspection.
• Typical: $200–$600 — sensor or harness replacement and calibration. Justified when sensor bench test or in-vehicle plausibility fails.
• High: $600–$1,500+ — control module replacement and calibration/programming. Only justified after all external tests pass and message/bus faults persist.

Factors affecting cost: dealer vs independent shop labor rates, part availability, vehicle integration complexity, and whether calibration or network programming is required. Always confirm the failing component by measurement and message tracing before authorizing parts.

Can I Still Drive With U0407?

You can often drive short distances with U0407, but risks depend on how the vehicle uses the steering angle message. Loss or invalid steering-angle data can disable or degrade Electronic Stability Control (ESC) and Anti-lock Braking System (ABS) functions that rely on that input. If stability or traction systems are disabled, driving in poor weather or emergency maneuvers becomes riskier. Prioritize safe routing to a repair facility and avoid high-speed or slippery conditions until the fault is traced and confirmed.

What Happens If You Ignore U0407?

Ignoring this network message fault can leave stability and traction aids operating with degraded or no steering-angle input, increasing crash risk during evasive maneuvers, and may allow a related message to cause other modules to enter limp or reduced-function modes. It can also mask intermittent wiring faults that worsen over time.

Last updated: March 1, 2026

Vehicles Commonly Affected by U0407

U0407 is commonly seen on vehicles with integrated steering-angle sensor networks and advanced stability systems, often reported on European and North American makes such as BMW, Mercedes‑Benz, and Ford. These manufacturers frequently use dedicated steering-angle sensors and multiple networked modules, increasing the number of places an invalid message can originate. Interpretation and component locations vary by make, model, and model year—confirm with basic wiring and CAN/LIN message tests for any specific vehicle.