U017D code meaning
Lost Communication With Restraints System Sensor N
What U017D means
U017D concerns restraint sensor N, the last of the fourteen sensor letters A to N; the two codes that follow belong to seat belt pretensioner modules. No manufacturer documents U017D publicly, and the Chrysler Jeep tables in NHTSA file PE11-019 never go past G. Bosch scales its premium airbag units to as many as 18 sensor inputs, so a fourteenth satellite is possible but rare. Most such sensors talk PSI5, an open interface developed from Autoliv, Bosch and Continental designs that sends Manchester-coded current pulses at 125 kbit/s over a twisted pair. That pair carries supply and data together, so a wiring repair must keep the twist and use approved crimp connectors. U047E is the invalid-data counterpart. Airbag lamp on, no MIL.
U017D at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U017D
- Airbag warning lamp on
- Scan tool reports no response from sensor N
- Restraint deployment relying on sensor N may be disabled
Common causes of U017D
- Most likelyConnector at sensor N loose or corroded
- PossibleEarlier wiring repair untwisted or with unsuitable connectors
- PossibleCrash sensor N failed
- Less likelyAirbag unit expects a sensor N that is not installed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Restraints sensor nCrash signal wiring
What each part of U017D means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7D | The exact fault in that area. |
What to do next
- Note U017D and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U017D
What does U017D mean?
U017D means "Lost Communication With Restraints System Sensor N". U017D concerns restraint sensor N, the last of the fourteen sensor letters A to N; the two codes that follow belong to seat belt pretensioner modules. It is a generic code, so it means the same on every make.
Is it safe to drive with U017D?
U017D does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U017D fail an emissions test?
U017D is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U017D to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U017D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.