What This Actually Means
In plain language — no jargon
The vehicle's compass module (typically in the rearview mirror) is not communicating with the main computer system. It's like a walkie-talkie that stopped responding to calls.
Symptoms You May Notice
3 known symptoms for this code
Compass display blank or not functioning on rearview mirror
Navigation system errors or loss of direction indication
No communication error messages on instrument cluster
How Your ECU Detects This
Technical sensor logic and voltage thresholds
The ECM continuously polls the compass module via CAN bus for directional data. The module should respond with heading information (N, S, E, W) within a set timeout window. If no valid response signal is received after multiple attempts, a communication fault is logged.
Voltage & Parameter Thresholds
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Compass Module Response Time | 0-500 milliseconds | No response or >1000 milliseconds |
| CAN Bus Signal Voltage | 2.5-3.5V | <0.5V or >5V |
Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Battery terminals
Disconnect and reconnect battery for 15 minutes to reset all modules and clear transient communication faults.
2
CAN bus wiring harness
Inspect the wiring behind rearview mirror and near door frame for corrosion, loose connectors, or damaged insulation.
3
Rearview mirror compass module
Remove mirror unit and reseat the connector; if still unresponsive, the module likely needs replacement.
When to See a Professional Mechanic
Not all fault codes are safe to DIY
Code U2013 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.
How to Clear Code U2013
What happens after you fix the fault
Once the fault is repaired, U2013 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.
✅ Safe to Clear When
- Fault has been diagnosed and repaired
- You want to confirm the repair worked
- Code appeared after a sensor was cleaned
⚠️ Do Not Clear When
- Preparing for an emissions/PUC test
- Root cause is still undiagnosed
- Check engine light is flashing
Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.