Invalid or Missing Network Data (Ford/GM enhanced comms)
The U1206 code means the vehicle's onboard diagnostic system has detected: Invalid or Missing Network Data (Ford/GM enhanced comms). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- Varies — depends on the specific component this manufacturer-specific code points to on your vehicle. Diagnose before buying parts.
Manufacturer-specific code. U1206 is a manufacturer-specific DTC, so its exact definition can differ by make, model, and year. Use the meaning above as a general guide, and always confirm it against your vehicle manufacturer's official service information (or a make-specific scan tool) before diagnosing or replacing parts.
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- Check Engine or a related warning light on
- Exact symptoms depend on the specific system this code covers for your make
- A make-specific scan reveals which subsystem and circuit is involved
Probable Causes (Ranked by Likelihood)
- A fault in the specific component or circuit this code monitors (the exact part varies by manufacturer) High
- Damaged wiring, a corroded connector, or a poor ground in that circuit Moderate
- A related sensor or control module reporting or causing the fault Moderate
Step-by-Step Diagnostic Procedure
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Confirm your exact make, model, and year first — U1206 is manufacturer-specific and can mean different things across brands.
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Read U1206 with an enhanced/make-specific scan tool and check your manufacturer's official service information for the precise definition and procedure.
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Inspect the wiring, connectors, and grounds for the indicated circuit before replacing any part.
Common Fixes by Vehicle
What techs usually find when diagnosing U1206 on specific vehicles — tap your vehicle for the fix and the exact part:
2005-2012 Honda Accord/Civic Moderate DIY
U1206 lost comm with immobilizer/key module on Honda typically means the transponder key isn't being read. Try a spare key first -- transponders can fail. If spare works, have a locksmith re-cut and re-chip the original. If neither key works, the immobilizer antenna around the ignition cylinder has failed -- Honda 35111-S84-A01 is the replacement.
Labor: 1-2 hours2008-2015 Honda Pilot/Odyssey Advanced DIY
Pilot and Odyssey set U1206 when the smart key module loses communication. Check the 12V battery voltage -- weak batteries frequently trigger this code. If battery is good, the keyless entry control unit behind the dash has lost communication. Honda requires HDS scan tool for programming replacement units.
Labor: 1-2 hours2006-2011 Honda Ridgeline/CR-V Moderate DIY
Ridgeline and CR-V U1206 is commonly the immobilizer amplifier (loop antenna) around the key cylinder. Pull the lower steering column cover and reseat the 4-pin connector to the amp. If code persists, swap the amp ($60-100). Dealer-only if the ECM itself needs re-pairing after amp replacement.
Labor: 1 hourFrequently Asked Questions
Does U1206 mean the same thing on every vehicle?
No. U1206 is a manufacturer-specific diagnostic trouble code, so its exact meaning varies by make, model, and year. Always confirm it against your vehicle manufacturer's service information before diagnosing or replacing parts.
What does U1206 most likely indicate?
Invalid or Missing Network Data (Ford/GM enhanced comms). Treat this as a general guide and verify the specifics for your vehicle.
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